Language feature availability flags to indicate whether a given C++ feature is supported by the current compiler. More...

Collaboration diagram for Compiler Features:

LBAL_CPP03
These are here only because compilers can be made to disable specific features for various reasons and we want to have a universal way of determining whether that’s happened.
#define	LBAL_CPP03_EXCEPTIONS
	Language-level support for C++ Exceptions.
#define	LBAL_CPP03_RTTI
	Language-level support for run-time type identification (RTTI).

LBAL_CPP11
All supported compilers support all required features of C++11. However, thread-safe static initialization can be explicitly disabled in some implementations, and garbage collection was an optional feature from C++11 until C++23, when it was removed. The rest of these are supplied to allow testing for specific features when using older language dialects, unsupported compilers, or when general language version detection is unavailable. Remarks This is not an exhaustive list of C++11 language features. Rather, it is currently mostly a collection of those with SD-6 macros. The feature checks themselves are not necessarily tested on the minimal-supported compiler versions, as we will often rely on external reporting or make assumptions based on what __cplusplus returns, which is not the case for more recent features.
#define	LBAL_CPP11_ALIAS_TEMPLATES
	Allow type aliases to be templated.
#define	LBAL_CPP11_ATTRIBUTES
	Formalize attributes as a language feature.
#define	LBAL_CPP11_ATTRIBUTE_CARRIES_DEPENDENCY
	Optimization hint when compiling with certain memory models.
#define	LBAL_CPP11_ATTRIBUTE_NORETURN
	Indicate that a function does not return.
#define	LBAL_CPP11_CONSTEXPR
	Specify generalized constant expressions.
#define	LBAL_CPP11_DECLTYPE
	Query the type of an expression.
#define	LBAL_CPP11_DELEGATING_CONSTRUCTORS
	Delegating constructors.
#define	LBAL_CPP11_INHERITING_CONSTRUCTORS
	Inheriting Constructors.
#define	LBAL_CPP11_INITIALIZER_LISTS
	Initializer lists.
#define	LBAL_CPP11_LAMBDAS
	Support for Lambda functions.
#define	LBAL_CPP11_MINIMAL_GARBAGE_COLLECTION
	Support for optional C++ garbage collection.
#define	LBAL_CPP11_NSDMI
	Support for non-static data member initializers.
#define	LBAL_CPP11_RANGE_BASED_FOR
	Range-based for-loops.
#define	LBAL_CPP11_RAW_STRINGS
	Support for raw string literals.
#define	LBAL_CPP11_REF_QUALIFIERS
	Extend move semantics to *this.
#define	LBAL_CPP11_RVALUE_REFERENCES
	Add rvalue references.
#define	LBAL_CPP11_STATIC_ASSERT
	Add static assertions.
#define	LBAL_CPP11_THREADSAFE_STATIC_INIT
	Support for thread-safe static initialization.
#define	LBAL_CPP11_UNICODE_CHARACTERS
	Add char16_t and char32_t with requisite Unicode encoding.
#define	LBAL_CPP11_UNICODE_LITERALS
	Support for Unicode string literals.
#define	LBAL_CPP11_USER_DEFINED_LITERALS
	Support for user-defined literals.
#define	LBAL_CPP11_VARIADIC_TEMPLATES
	Support for templates with variable numbers of arguments.

LBAL_CPP14
All supported compilers support all features of C++14, but some of them may require that sized deallocation be explicitly enabled.
#define	LBAL_CPP14_AGGREGATE_NSDMI
	Relax the requirements on aggregates and specify aggregate member initialization.
#define	LBAL_CPP14_ATTRIBUTE_DEPRECATED
	Support for marking symbols as deprecated.
#define	LBAL_CPP14_BINARY_LITERALS
	Add binary literal support.
#define	LBAL_CPP14_CONSTEXPR_RELAXED_CONSTRAINTS
	Relax constraints on constexpr functions, constexpr member functions and implicit const.
#define	LBAL_CPP14_DECLTYPE_AUTO
	Allow deduced return types and decltype (auto).
#define	LBAL_CPP14_GENERIC_LAMBDAS
	Generic (Polymorphic) Lambda Expressions.
#define	LBAL_CPP14_INIT_CAPTURES
	Generalized Lambda-capture changes.
#define	LBAL_CPP14_RETURN_TYPE_DEDUCTION
	Support for return type deduction for normal functions.
#define	LBAL_CPP14_SIZED_DEALLOCATION
	Make available a global operator delete that takes a size argument.
#define	LBAL_CPP14_VARIABLE_TEMPLATES
	Support for variable templates.

LBAL_CPP17
All supported compilers support all language features of C++17, but some of them may require that template template arguments be explicitly enabled.
#define	LBAL_CPP17_AGGREGATE_BASES
	Relax the restrictions on aggregate initialization.
#define	LBAL_CPP17_ALIGNED_NEW
	Specify handling of dynamic memory allocation for over-aligned data.
#define	LBAL_CPP17_ATTRIBUTE_FALLTHROUGH
	Indicate that a case within a switch statements falls through.
#define	LBAL_CPP17_ATTRIBUTE_MAYBE_UNUSED
	Indicate that a name or entity is possibly intentionally unused.
#define	LBAL_CPP17_ATTRIBUTE_NODISCARD
	Indicate that a function return, class, or enum should not be ignored.
#define	LBAL_CPP17_CAPTURE_STAR_THIS
	Allow lambda capture of this by value as as [=,this].
#define	LBAL_CPP17_CONSTEXPR_LAMBDA
	Allow lambdas to be constexpr explicitly or implicitly.
#define	LBAL_CPP17_DEDUCTION_GUIDES
	Template argument deduction for class templates.
#define	LBAL_CPP17_DEDUCTION_GUIDES_DR
	Address additional class template argument deduction issues.
#define	LBAL_CPP17_DEDUCTION_GUIDES_NB
	Address issues that came up during C++17 balloting regarding class template argument deduction.
#define	LBAL_CPP17_ENUMERATOR_ATTRIBUTES
	Attributes for enumerators.
#define	LBAL_CPP17_FOLD_EXPRESSIONS
	Allow folding a template parameter pack over a binary operator.
#define	LBAL_CPP17_FOLD_EXPRESSIONS_REVISED
	Add support for unary folds and empty parameter packs to fold expressions.
#define	LBAL_CPP17_GUARANTEED_COPY_ELISION
	Guarantee copy and move elision in well-defined situations.
#define	LBAL_CPP17_HEX_FLOAT
	Specify Hexadecimal float literals.
#define	LBAL_CPP17_IF_CONSTEXPR
	Allow constant expressions as if statements.
#define	LBAL_CPP17_INHERITING_CONSTRUCTORS_REVISED
	Address core issues raised by Inheriting Constructors.
#define	LBAL_CPP17_INLINE_VARIABLES
	inline variables
#define	LBAL_CPP17_NAMESPACE_ATTRIBUTES
	Attributes for namespaces.
#define	LBAL_CPP17_NOEXCEPT_FUNCTION_TYPE
	Make exception specifications be part of the type system.
#define	LBAL_CPP17_NONTYPE_TEMPLATE_ARGS
	Allow constant evaluation for all non-type template arguments.
#define	LBAL_CPP17_NONTYPE_TEMPLATE_PARAMETER_AUTO
	Allow declaring non-type template arguments with auto.
#define	LBAL_CPP17_RANGE_BASED_FOR_GENERALIZED
	Generalize range-based for-loops.
#define	LBAL_CPP17_STATIC_ASSERT_NO_MESSAGE
	Allow static assertions with no messages.
#define	LBAL_CPP17_STRUCTURED_BINDINGS
	Add support for multiple function return values and more.
#define	LBAL_CPP17_TEMPLATE_TEMPLATE_ARGS
	Resolve a defect in the matching of template arguments with template parameters.
#define	LBAL_CPP17_VARIADIC_USING
	Add support for pack expansions in using-declarations.

LBAL_CPP20
Identify language features specific to the C++20 Standard Support across compilers for C++20 features is currently inconsistent, and is one of the fundamental reasons why lucenaBAL exists. These will be updated regularly as the Standard develops. Note that a very large number of features do not have SD-6 macros, so we often provide our own tokens. Should an official macro be created, we will synchronize with it and deprecate the proprietary one.
#define	LBAL_CPP20_AGGREGATE_PAREN_INIT
	Allow aggregate initialization from parentheses as well as braces.
#define	LBAL_CPP20_ALLOW_LAMBDA_CAPTURE_EQUALS_THIS
	Allow lambda capture [=, this].
#define	LBAL_CPP20_ATTRIBUTES_LIKELY_AND_UNLIKELY
	Aggregate tracking the availability of likely and unlikely attributes.
#define	LBAL_CPP20_ATTRIBUTE_LIKELY
	Add likely attribute for labels and statements.
#define	LBAL_CPP20_ATTRIBUTE_NODISCARD_EXPANDED
	Add explanatory text to the nodiscard attribute and allow it on constructors.
#define	LBAL_CPP20_ATTRIBUTE_NO_UNIQUE_ADDRESS
	Add language support for for empty objects.
#define	LBAL_CPP20_ATTRIBUTE_UNLIKELY
	Add unlikely attribute for labels and statements.
#define	LBAL_CPP20_CHAR8_T
	Add char8_t as a UTF-8 equivalent for char16_t and char32_t.
#define	LBAL_CPP20_CONCEPTS
	Incorporate the Concepts TS into the Standard.
#define	LBAL_CPP20_CONCEPTS_CONDITIONALLY_TRIVIAL_SPECIAL_MEMBER_FUNCTIONS
	Make special member functions conditionally trivial.
#define	LBAL_CPP20_CONCEPTS_REFINE_RETURN_TYPE_REQUIREMENTS
	Refine definition of return-type-requirements.
#define	LBAL_CPP20_CONCEPTS_RESPECIFY_RETURN_TYPE_REQUIREMENTS
	Refine definition of return-type-requirements.
#define	LBAL_CPP20_CONDITIONAL_EXPLICIT
	Support explicit (bool).
#define	LBAL_CPP20_CONSTEVAL
	Immediate functions.
#define	LBAL_CPP20_CONSTEXPR_CHANGE_ACTIVE_UNION_MEMBER
	Allow the active member of a union inside constexpr to change.
#define	LBAL_CPP20_CONSTEXPR_DYNAMIC_ALLOC
	Language support for variable-sized containers suitable for use in constexpr computations.
#define	LBAL_CPP20_CONSTEXPR_DYNAMIC_POLYMORPHISM
	Allow dynamic_cast, polymorphic typeid in constexpr functions.
#define	LBAL_CPP20_CONSTEXPR_INTRINSICS
	Permit unevaluated inline assembly in constexpr functions.
#define	LBAL_CPP20_CONSTEXPR_IN_DECLTYPE
	Address Core Issue regarding when constexpr functions are defined.
#define	LBAL_CPP20_CONSTEXPR_TRIVIAL_DEFAULT_INITIALIZATION
	Address an inconsistency in the lambda specification.
#define	LBAL_CPP20_CONSTEXPR_TRY_CATCH
	Permit unevaluated inline assembly in constexpr functions.
#define	LBAL_CPP20_CONSTEXPR_UNION_ALTERATION
	Allow changing the active member of a union inside constexpr.
#define	LBAL_CPP20_CONSTEXPR_VIRTUAL_FUNCTION
	Allow virtual function calls in constexpr functions.
#define	LBAL_CPP20_CONSTINIT
	Add the constinit keyword.
#define	LBAL_CPP20_CONST_REF_QUALIFIED_POINTERS_TO_MEMBERS
	Fix const-qualified pointers to members.
#define	LBAL_CPP20_DEDUCTION_GUIDES_FOR_AGGREGATES
	Class template argument deduction for aggregates.
#define	LBAL_CPP20_DEFAULT_CONSTRUCTIBLE_AND_ASSIGNABLE_STATELESS_LAMBDAS
	Support default-constructible and -assignable stateless lambdas.
#define	LBAL_CPP20_DEFAULT_MEMBER_INITIALIZERS_FOR_BIT_FIELDS
	Default member initializers for bit-fields.
#define	LBAL_CPP20_DESIGNATED_INITIALIZERS
	Add designated initializers.
#define	LBAL_CPP20_DESTROYING_DELETE
	Efficient sized delete for variable sized classes.
#define	LBAL_CPP20_GENERIC_LAMBDAS_TEMPLATE_PARAMETER_LIST
	Generic (Polymorphic) Lambda Expressions.
#define	LBAL_CPP20_IMPL_COROUTINE
	Add necessary language support for the <coroutine> library feature.
#define	LBAL_CPP20_INIT_CAPTURES_PACK_EXPANSION
	Allow pack-expansion in lambda init-capture.
#define	LBAL_CPP20_INIT_STATEMENTS_FOR_RANGE_BASED_FOR
	Add range-based for statements with initializer.
#define	LBAL_CPP20_INTEGRATING_OUR_FEATURE_TEST_MACROS
	Integrate universal feature test macros into the Standard.
#define	LBAL_CPP20_MODULES
	Incorporate modules.
#define	LBAL_CPP20_NONTYPE_TEMPLATE_ARGS_FIXES
	Address inconsistencies in handling of non-type template arguments.
#define	LBAL_CPP20_NONTYPE_TEMPLATE_PARAMETER_CLASS
	Class Types in Non-Type Template Parameters.
#define	LBAL_CPP20_THREE_WAY_COMPARISON_OPERATOR
	This is the original three-way comparison operator.
#define	LBAL_CPP20_THREE_WAY_COMPARISON_OPERATOR_EQUALITY_FIX
	This is the original three-way comparison operator.
#define	LBAL_CPP20_THREE_WAY_COMPARISON_OPERATOR_TUNEUP
	This is the updated three-way comparison operator.
#define	LBAL_CPP20_TYPENAME_OPTIONAL
	Down with typename!
#define	LBAL_CPP20_USING_ENUM
	Specify using aliases for enums.
#define	LBAL_CPP20_VA_OPT
	Provide a smarter predefined macro equivalent to VA__ARGS.

LBAL_CPP23
Identify language features specific to the C++23 Standard Support across compilers for C++23 features is currently inconsistent, and is one of the fundamental reasons why lucenaBAL exists. These will be updated regularly as the Standard develops. Note that a some features do not have formal SD-6 tokens, so we often provide our own. Should an official token be created, we will synchronize with it and deprecate the proprietary one.
#define	LBAL_CPP23_ATTRIBUTE_ASSUME
	Optimization hint to indicate an expression is true.
#define	LBAL_CPP23_AUTO_CAST
	auto(x): decay-copy in the language
#define	LBAL_CPP23_CHAR8_T_COMPATIBILITY
	char8_t Compatibility and Portability Fix
#define	LBAL_CPP23_CONSTEVAL_PROPAGATE_UP
	consteval needs to propagate up
#define	LBAL_CPP23_CONSTEXPR_NON_LITERAL_VARIABLES
	Allow non-literal variables, labels, and gotos in constexpr functions.
#define	LBAL_CPP23_CONSTEXPR_PERMIT_STATIC_CONSTEXPR
	Permit static constexpr variables in constexpr functions.
#define	LBAL_CPP23_CONSTEXPR_RELAX_RESTRICTIONS
	Relax some constexpr restrictions.
#define	LBAL_CPP23_DEDUCTION_GUIDES_FROM_INHERITED_CONSTRUCTORS
	Allow class template argument deduction from inherited constructors.
#define	LBAL_CPP23_EXPLICIT_THIS_PARAMETER
	Deduce this.
#define	LBAL_CPP23_IF_CONSTEVAL
	if consteval
#define	LBAL_CPP23_IMPLICIT_MOVE
	Simpler implicit move.
#define	LBAL_CPP23_MULTIDIMENSIONAL_SUBSCRIPT
	Add a multidimensional subscript operator.
#define	LBAL_CPP23_MULTIDIMENSIONAL_SUBSCRIPT_STATIC
	static operator []
#define	LBAL_CPP23_NAMED_CHARACTER_ESCAPES
	Add named universal character escapes.
#define	LBAL_CPP23_RANGE_BASED_FOR_TEMPORARIES
	Allow some temporaries in range-based for-loops.
#define	LBAL_CPP23_SIZE_T_SUFFIX
	Add literal suffixes for (signed) size_t.
#define	LBAL_CPP23_STATIC_CALL_OPERATOR
	Static operator ().

LBAL_CPP26
Identify language features specific to the C++26 Standard Support across compilers for C++26 features is currently inconsistent, and is one of the fundamental reasons why lucenaBAL exists. These will be updated regularly as the Standard develops. Note that a some features do not have formal SD-6 tokens, so we often provide our own. Should an official token be created, we will synchronize with it and deprecate the proprietary one.
#define	LBAL_CPP26_ATTRIBUTE_INDETERMINATE
	Erroneous behaviour for uninitialized reads.
#define	LBAL_CPP26_CONSTEXPR_CAST_FROM_VOID_STAR
	All constexpr cast from void *.
#define	LBAL_CPP26_CONSTEXPR_EXCEPTIONS
	Allow exception throwing in constant-evaluation.
#define	LBAL_CPP26_CONSTEXPR_PLACEMENT_NEW
	Add constexpr placement new.
#define	LBAL_CPP26_CONSTEXPR_VIRTUAL_INHERITANCE
	Allow exception throwing in constant-evaluation.
#define	LBAL_CPP26_CONTRACTS
	Contracts for C++.
#define	LBAL_CPP26_DELETED_FUNCTION
	= delete(\should have a reason\).
#define	LBAL_CPP26_EXPANSION_STATEMENTS
	Expansion statements.
#define	LBAL_CPP26_IMPL_REFLECTION
	Reflection for C++26.
#define	LBAL_CPP26_IMPL_REFLECTION_CLEANUP
	Miscellaneous Reflection Cleanup.
#define	LBAL_CPP26_PACK_INDEXING
	Pack Indexing.
#define	LBAL_CPP26_PLACEHOLDER_VARIABLES
	Add placeholder variables (aka underscore, underbar, low line).
#define	LBAL_CPP26_PP_EMBED
	#embed - a scannable, tooling-friendly binary resource inclusion mechanism
#define	LBAL_CPP26_STATIC_ASSERT_USER_MESSAGE
	Allow static assertions with user-generated messages.
#define	LBAL_CPP26_STRUCTURED_BINDINGS_ATTRIBUTES
	Allow attributes for Structured Bindings.
#define	LBAL_CPP26_STRUCTURED_BINDINGS_PACK
	Structured Bindings can introduce a Pack.
#define	LBAL_CPP26_TEMPLATE_PARAMETERS
	Allow concept and variable-template template-parameters.
#define	LBAL_CPP26_TRIVIAL_UNION
	Allow trivial unions.
#define	LBAL_CPP26_TRIVIAL_UNION_LIFETIME
	Adjustments to union Lifetime Rules.
#define	LBAL_CPP26_VARIADIC_FRIEND
	Support variadic friends.

LBAL_CPP2D
Identify language features specific to the proposed C++29 Standard C++29—which in draft form is referenced as C++2d—is undergoing active development. In order to allow testing, we track approved language features here. Since this is all non-final, we use LBAL_CPP2D_xxx tokens instead of LBAL_CPP29_xxx tokens; upon finalization, we’ll update the token names and deprecate the old forms. Designation of formal SD-6 tokens tends to lag approval of proposals, so we will used the proposed tokens and derive our own tokens from those; where there is not even a proposed token, we’ll make one up. Once official tokens are created, we will synchronize with them it and deprecate the speculative ones.
#define	LBAL_CPP2D_CONCEPTS_CONDITIONAL_NOEXCEPT
	Conditional noexcept specifiers in compound requirements.
#define	LBAL_CPP2D_CONSTEVAL_ONLY
	consteval-only Values for C++26
#define	LBAL_CPP2D_CONTRACTS_VIRTUAL
	Contracts for C++: Virtual functions.
#define	LBAL_CPP2D_DESIGNATED_INITIALIZERS_BASE_CLASSES
	Designated-initializers for Base Classes.
#define	LBAL_CPP2D_IMPL_COROUTINE_RETURN
	return_value & return_void Are Not Mutually Exclusive
#define	LBAL_CPP2D_PACK_INDEXING_TEMPLATE_NAMES
	Pack Indexing for Template Names.
#define	LBAL_CPP2D_PP_EMBED_OFFSET
	#embed offset parameter

LBAL_C99
Feature availability macros to indicate whether a given C99 feature is supported by the current compiler. Each one is set to 1 if available and 0 otherwise.
#define	LBAL_C99_PREPROCESSOR

Detailed Description

Language feature availability flags to indicate whether a given C++ feature is supported by the current compiler.

These are set to a non-zero value if available and 0 otherwise; every token is always set to some value. Where possible, these mimic the equivalent SD-6 macros, both in their naming and in their range of values, so a value will be:

0, to indicate no availability, or
the SD-6 value equivalent to the available feature support, or
1, if there is no equivalent SD-6 macro

Note that these tokens are neither exhaustive nor bounded:

Features which are available in all supported compilers are not required to have associated tokens. However, features that could conceivably be manually disabled in a given compiler—e.g., exception handling—always have tokens; whether the token is set to a non-0 value depends on the feature’s availability at build time.
Features we (the developers) have not had cause to use or care about are often not represented right away. Eventually, all language features accepted into the Standard from C++20 onwards will appear here.
Features from proposals to the Standard may have flags here; in some cases, this may occur for proposed features that have not been accepted into the Standard, e.g., as part of a Technical Specification. This typically happens with de facto standards (e.g., variants on symbol visibility handling) when it relates to language features. This sort of thing is much more common for proposed library features (e.g., likely/unlikely support was made available long before it was formally voted in).

Finally, the descriptions of the various language and library features listed here tend to be terse or oblique. This is because this documentation is not intended to be a C++ reference there are much better references out there. Rather, it is hoped that enough context is given to remind you of what a given feature does, and then any additional notes are intended only to describe gotchas and implementation oddities specific to the feature detection problem domain.

Remarks: (APIME) Some SD-6 tokens have their values bumped by newer iterations of the Document. Generally, we will issue new unique tokens here when this happens, but the values of all such tokens will reflect that of the equivalent supported SD-6 token value. For example, if SD-6 token __cpp_meow has 4 different values associated with it from 4 proposals against 4 successive Standards, we will define 4 unique tokens, one for each proposal. If the current build environment only supports the first 3 of the 4 proposals, 3 of our tokens will be set to the most recent suppoeted proposal’s value for __cpp_meow, while the 4th of our tokens, representing the most recent—and unsupported—proposal, will be set to 0.; (SEEME - bitweeder) Note that there are ambiguous cases where a feature may have been updated, e.g., as a result of a Defect Report (DR), but a new SD-6 value has not been assigned; this can be further complicated if the DR resolution is not finalized, meaning that the available feature is in an intermediate state. Currently, we have no policy for dealing with this situation, as it has not arisen yet in practice.; (APIME) Previous iterations of this header also attempted to determine whether various C99 and C11 features were available. This turned out to be impractical and a bit pointless. As a result, such features are only tracked - if they are tracked at all - in the context of their applicability to a given C++ Standard, e.g., support for the C99 preprocessor as required by C++11, and the C11 preprocessor as required by C++20.; (SEEME - bitweeder) Some implementations may choose to make a feature available to an earlier C++ release than the the first officially supported one. This can be done, for example, to make features available from a Draft Standard. Generally, we don’t second-guess the implementation if they set an SD-6 macro a particular—unless we have good reason to know it was set incorrectly. More challenging is dealing with implementations that don’t have SD-6 macros. Our approach in this case is to identify a feature as available if the implementation is known to support it and the Language version in use is greater than the last unsupported version; this latter condition catches the frequent convention of compilers identifying a future unreleased dialect as the last Standard (e.g., 201103L) plus one (e.g., 201104L), until the Standard is official and the the version changes (e.g., to 201402L).; (APIME) Features prior to the C++20 Standard are represented by tokens generally only if they have equivalent SD-6 tokens. Support can be broadened if there is demand.; The SD-6 tokens and their values referenced here are current as of the 2026-02-02 revision.

Macro Definition Documentation

◆ LBAL_C99_PREPROCESSOR

#define LBAL_C99_PREPROCESSOR

Remarks: (SEEME - bitweeder) Only older versions of MSVS are known to have problems with this, despite otherwise conforming to the C++11 Standard. Note that if support requires having a particular compiler switch set to get compatibility, this token will mirror that condition.

◆ LBAL_CPP03_EXCEPTIONS

#define LBAL_CPP03_EXCEPTIONS

Language-level support for C++ Exceptions.

This can be conditionally disabled at build-time, so we can’t rely on a language version test to detect it.

SD-6 equivalent: __cpp_exceptions >= 199711L. This token will have a value of 0 if the proposal described here is not supported.

199711L N1146 C++98 Final Working Draft

Remarks: This is based on the non-existent __cpp_exceptions SD-6 token, which does not appear in any Standard document but which everyone agrees exists. Despite being a de facto language extension, it’s safe to rely on since all compilers appear to support it.

◆ LBAL_CPP03_RTTI

#define LBAL_CPP03_RTTI

Language-level support for run-time type identification (RTTI).

This can be conditionally disabled at build-time, so we can’t rely on a language version test to detect it.

SD-6 equivalent: __cpp_rtti >= 199711L. This token will have a value of 0 if the proposal described here is not supported.

199711L N1146 C++98 Final Working Draft

Remarks: This is based on the non-existent __cpp_rtti SD-6 token, which does not appear in any Standard document but which everyone agrees exists. Despite being a de facto language extension, it’s safe to rely on since all compilers appear to support it.

◆ LBAL_CPP11_ALIAS_TEMPLATES

#define LBAL_CPP11_ALIAS_TEMPLATES

Allow type aliases to be templated.

SD-6 equivalent: __cpp_alias_templates >= 200704L. This token will have a value of 0 if the proposal described here is not supported.

200704L N2258 PDF Templates Aliases

◆ LBAL_CPP11_ATTRIBUTE_CARRIES_DEPENDENCY

#define LBAL_CPP11_ATTRIBUTE_CARRIES_DEPENDENCY

Optimization hint when compiling with certain memory models.

SD-6 equivalent: __has_cpp_attribute(carries_dependency) >= 200809L. This token will have a value of 0 if the proposal described here is not supported.

200809L N2782 PDF C++ Data-Dependency Ordering: Function Annotation

◆ LBAL_CPP11_ATTRIBUTE_NORETURN

#define LBAL_CPP11_ATTRIBUTE_NORETURN

Indicate that a function does not return.

SD-6 equivalent: __has_cpp_attribute(noreturn) >= 200809L. This token will have a value of 0 if the proposal described here is not supported.

200809L N2761 PDF Towards support for attributes in C++ (Revision 6)

◆ LBAL_CPP11_ATTRIBUTES

#define LBAL_CPP11_ATTRIBUTES

Formalize attributes as a language feature.

SD-6 equivalent: __cpp_attributes >= 200809L. This token will have a value of 0 if the proposal described here is not supported.

200809L N2761 PDF Towards support for attributes in C++ (Revision 6)

◆ LBAL_CPP11_CONSTEXPR

#define LBAL_CPP11_CONSTEXPR

Specify generalized constant expressions.

SD-6 equivalent: __cpp_constexpr >= 200704L. Note that __cpp_constexpr has multiple values associated with it from a number of different proposals, so this token will have the value of the latest supported proposal, or 0 if the proposal described here is not supported.

200704L N2235 PDF Generalized Constant Expressions—Revision 5

◆ LBAL_CPP11_DECLTYPE

#define LBAL_CPP11_DECLTYPE

Query the type of an expression.

SD-6 equivalent: __cpp_decltype >= 200707L. This token will have a value of 0 if the proposal described here is not supported.

200707L N2343 PDF Decltype (revision 7): proposed wording

◆ LBAL_CPP11_DELEGATING_CONSTRUCTORS

#define LBAL_CPP11_DELEGATING_CONSTRUCTORS

Delegating constructors.

SD-6 equivalent: __cpp_delegating_constructors >= 200604L. This token will have a value of 0 if the proposal described here is not supported.

200604L N1986 PDF Delegating Constructors (revision 3)

◆ LBAL_CPP11_INHERITING_CONSTRUCTORS

#define LBAL_CPP11_INHERITING_CONSTRUCTORS

Inheriting Constructors.

SD-6 equivalent: __cpp_inheriting_constructors >= 200802L. Note that __cpp_inheriting_constructors has multiple values associated with it from a number of different proposals, so this token will have the value of the latest supported proposal, or 0 if the proposal described here is not supported.

200802L N2540 Inheriting Constructors (revision 5)

◆ LBAL_CPP11_INITIALIZER_LISTS

#define LBAL_CPP11_INITIALIZER_LISTS

Initializer lists.

SD-6 equivalent: __cpp_initializer_lists >= 200806L. This token will have a value of 0 if the proposal described here is not supported.

200806L N2672 Initializer List proposed wording

◆ LBAL_CPP11_LAMBDAS

#define LBAL_CPP11_LAMBDAS

Support for Lambda functions.

SD-6 equivalent: __cpp_lambdas >= 200907L. This token will have a value of 0 if the proposal described here is not supported.

200907L N2927 PDF New wording for C++0x Lambdas (rev. 2)

◆ LBAL_CPP11_NSDMI

#define LBAL_CPP11_NSDMI

Support for non-static data member initializers.

SD-6 equivalent: __cpp_nsdmi >= 200809L. This token will have a value of 0 if the proposal described here is not supported.

200809L N2756 Non-static data member initializers

◆ LBAL_CPP11_RANGE_BASED_FOR

#define LBAL_CPP11_RANGE_BASED_FOR

Range-based for-loops.

SD-6 equivalent: __cpp_range_based_for >= 200907L. Note that __cpp_range_based_for has multiple values associated with it from a number of different proposals, so this token will have the value of the latest supported proposal, or 0 if the proposal described here is not supported.

200907L N2930 Range-Based For Loop Wording (Without Concepts)

◆ LBAL_CPP11_RAW_STRINGS

#define LBAL_CPP11_RAW_STRINGS

Support for raw string literals.

SD-6 equivalent: __cpp_raw_strings >= 200710L. This token will have a value of 0 if the proposal described here is not supported.

200710L N2442 Raw and Unicode String Literals; Unified Proposal (Rev. 2)

◆ LBAL_CPP11_REF_QUALIFIERS

#define LBAL_CPP11_REF_QUALIFIERS

Extend move semantics to *this.

SD-6 equivalent: __cpp_ref_qualifiers >= 200710L. This token will have a value of 0 if the proposal described here is not supported.

200710L N2439 Extending move semantics to *this (revised wording)

◆ LBAL_CPP11_RVALUE_REFERENCES

#define LBAL_CPP11_RVALUE_REFERENCES

Add rvalue references.

SD-6 equivalent: __cpp_rvalue_references >= 200610L. This token will have a value of 0 if the proposal described here is not supported.

200610L N2118 A Proposal to Add an Rvalue Reference to the C++ Language: Proposed Wording: Revision 3

◆ LBAL_CPP11_STATIC_ASSERT

#define LBAL_CPP11_STATIC_ASSERT

Add static assertions.

SD-6 equivalent: __cpp_static_assert >= 200410L. Note that __cpp_static_assert has multiple values associated with it from a number of different proposals, so this token will have the value of the latest supported proposal, or 0 if the proposal described here is not supported.

200410L N1720 Proposal to Add Static Assertions to the Core Language (Revision 3)

◆ LBAL_CPP11_THREADSAFE_STATIC_INIT

#define LBAL_CPP11_THREADSAFE_STATIC_INIT

Support for thread-safe static initialization.

Some compilers can disable this feature if asked; the token will be set to 0 if that has happened.

SD-6 equivalent: __cpp_threadsafe_static_init >= 200806L. This token will have a value of 0 if the proposal described here is not supported.

200806L N2660 Dynamic Initialization and Destruction with Concurrency

◆ LBAL_CPP11_UNICODE_CHARACTERS

#define LBAL_CPP11_UNICODE_CHARACTERS

Add char16_t and char32_t with requisite Unicode encoding.

SD-6 equivalent: __cpp_unicode_characters >= 200704L. This token will have a value of 0 if the proposal described here is not supported.

200704L N2249 New Character Types in C++

◆ LBAL_CPP11_UNICODE_LITERALS

#define LBAL_CPP11_UNICODE_LITERALS

Support for Unicode string literals.

SD-6 equivalent: __cpp_unicode_literals >= 200710L. This token will have a value of 0 if the proposal described here is not supported.

200710L N2442 Raw and Unicode String Literals; Unified Proposal (Rev. 2)

◆ LBAL_CPP11_USER_DEFINED_LITERALS

#define LBAL_CPP11_USER_DEFINED_LITERALS

Support for user-defined literals.

SD-6 equivalent: __cpp_user_defined_literals >= 200809L. This token will have a value of 0 if the proposal described here is not supported.

200809L N2765 PDF User-defined Literals (aka. Extensible Literals (revision 5))

◆ LBAL_CPP11_VARIADIC_TEMPLATES

#define LBAL_CPP11_VARIADIC_TEMPLATES

Support for templates with variable numbers of arguments.

SD-6 equivalent: __cpp_variadic_templates >= 200704L. This token will have a value of 0 if the proposal described here is not supported.

200704L N2242 PDF Proposed Wording for Variadic Templates (Revision 2)

◆ LBAL_CPP14_AGGREGATE_NSDMI

#define LBAL_CPP14_AGGREGATE_NSDMI

Relax the requirements on aggregates and specify aggregate member initialization.

SD-6 equivalent: __cpp_aggregate_nsdmi >= 201304L. This token will have a value of 0 if the proposal described here is not supported.

201304L N3653 Member initializers and aggregates

◆ LBAL_CPP14_ATTRIBUTE_DEPRECATED

#define LBAL_CPP14_ATTRIBUTE_DEPRECATED

Support for marking symbols as deprecated.

SD-6 equivalent: __has_cpp_attribute(deprecated) >= 201309L. This token will have a value of 0 if the proposal described here is not supported.

201309L N3760 [[deprecated]] attribute

◆ LBAL_CPP14_BINARY_LITERALS

#define LBAL_CPP14_BINARY_LITERALS

Add binary literal support.

SD-6 equivalent: __cpp_binary_literals >= 201304L. This token will have a value of 0 if the proposal described here is not supported.

201304L N3472 PDF Binary Literals in the C+
Core Language

◆ LBAL_CPP14_CONSTEXPR_RELAXED_CONSTRAINTS

#define LBAL_CPP14_CONSTEXPR_RELAXED_CONSTRAINTS

Relax constraints on constexpr functions, constexpr member functions and implicit const.

SD-6 equivalent: __cpp_constexpr >= 201304L. Note that __cpp_constexpr has multiple values associated with it from a number of different proposals, so this token will have the value of the latest supported proposal, or 0 if the proposal described here is not supported.

201304L N3652 Relaxing constraints on constexpr functions / constexpr member functions and implicit const

◆ LBAL_CPP14_DECLTYPE_AUTO

#define LBAL_CPP14_DECLTYPE_AUTO

Allow deduced return types and decltype (auto).

SD-6 equivalent: __cpp_decltype_auto >= 201304L. This token will have a value of 0 if the proposal described here is not supported.

201304L N3638 Return type deduction for normal functions

◆ LBAL_CPP14_GENERIC_LAMBDAS

#define LBAL_CPP14_GENERIC_LAMBDAS

Generic (Polymorphic) Lambda Expressions.

SD-6 equivalent: __cpp_generic_lambdas >= 201304L. Note that __cpp_generic_lambdas has multiple values associated with it from a number of different proposals, so this token will have the value of the latest supported proposal, or 0 if the proposal described here is not supported.

201304L N3649 Generic (Polymorphic) Lambda Expressions (Revision 3)

◆ LBAL_CPP14_INIT_CAPTURES

#define LBAL_CPP14_INIT_CAPTURES

Generalized Lambda-capture changes.

SD-6 equivalent: __cpp_init_captures >= 201304L. Note that __cpp_init_captures has multiple values associated with it from a number of different proposals, so this token will have the value of the latest supported proposal, or 0 if the proposal described here is not supported.

201304L N3648 Wording Changes for Generalized Lambda-capture

◆ LBAL_CPP14_RETURN_TYPE_DEDUCTION

#define LBAL_CPP14_RETURN_TYPE_DEDUCTION

Support for return type deduction for normal functions.

SD-6 equivalent: __cpp_return_type_deduction >= 201304L. This token will have a value of 0 if the proposal described here is not supported.

201304L N3638 Return type deduction for normal functions

◆ LBAL_CPP14_SIZED_DEALLOCATION

#define LBAL_CPP14_SIZED_DEALLOCATION

Make available a global operator delete that takes a size argument.

SD-6 equivalent: __cpp_sized_deallocation >= 201309L. This token will have a value of 0 if the proposal described here is not supported.

201309L N3778 C++ Sized Deallocation

Remarks: Some compilers disable this by default since it’s an ABI-breaking change; clang, in particular, does this.

◆ LBAL_CPP14_VARIABLE_TEMPLATES

#define LBAL_CPP14_VARIABLE_TEMPLATES

Support for variable templates.

SD-6 equivalent: __cpp_variable_templates >= 201304L. This token will have a value of 0 if the proposal described here is not supported.

201304L N3651 PDF Variable Templates (Revision 1)

◆ LBAL_CPP17_AGGREGATE_BASES

#define LBAL_CPP17_AGGREGATE_BASES

Relax the restrictions on aggregate initialization.

SD-6 equivalent: __cpp_aggregate_bases >= 201603L. This token will have a value of 0 if the proposal described here is not supported.

201603L P0017R1 Extension to aggregate initialization

◆ LBAL_CPP17_ALIGNED_NEW

#define LBAL_CPP17_ALIGNED_NEW

Specify handling of dynamic memory allocation for over-aligned data.

SD-6 equivalent: __cpp_aligned_new >= 201606L. This token will have a value of 0 if the proposal described here is not supported.

201606L P0035R4 Dynamic memory allocation for over-aligned data

◆ LBAL_CPP17_ATTRIBUTE_FALLTHROUGH

#define LBAL_CPP17_ATTRIBUTE_FALLTHROUGH

Indicate that a case within a switch statements falls through.

SD-6 equivalent: __has_cpp_attribute(fallthrough) >= 201603L. This token will have a value of 0 if the proposal described here is not supported.

201603L P0188R1 PDF Wording for [[fallthrough]] attribute

◆ LBAL_CPP17_ATTRIBUTE_MAYBE_UNUSED

#define LBAL_CPP17_ATTRIBUTE_MAYBE_UNUSED

Indicate that a name or entity is possibly intentionally unused.

SD-6 equivalent: __has_cpp_attribute(maybe_unused) >= 201603L. This token will have a value of 0 if the proposal described here is not supported.

201603L P0212R1 PDF Wording for [[maybe_unused]] attribute

◆ LBAL_CPP17_ATTRIBUTE_NODISCARD

#define LBAL_CPP17_ATTRIBUTE_NODISCARD

Indicate that a function return, class, or enum should not be ignored.

SD-6 equivalent: __has_cpp_attribute(nodiscard) >= 201603L. Note that __has_cpp_attribute(nodiscard) has multiple values associated with it from a number of different proposals, so this token will have the value of the latest supported proposal, or 0 if the proposal described here is not supported.

201603L P0189R1 PDF Wording for [[nodiscard]] attribute

◆ LBAL_CPP17_CAPTURE_STAR_THIS

#define LBAL_CPP17_CAPTURE_STAR_THIS

Allow lambda capture of *this by value as as [=,*this].

SD-6 equivalent: __cpp_capture_star_this >= 201603L. This token will have a value of 0 if the proposal described here is not supported.

201603L P0018R3 Lambda Capture of *this by Value as [=,*this]

◆ LBAL_CPP17_CONSTEXPR_LAMBDA

#define LBAL_CPP17_CONSTEXPR_LAMBDA

Allow lambdas to be constexpr explicitly or implicitly.

SD-6 equivalent: __cpp_constexpr >= 201603L. Note that __cpp_constexpr has multiple values associated with it from a number of different proposals, so this token will have the value of the latest supported proposal, or 0 if the proposal described here is not supported.

201603L P0170R1 PDF Wording for Constexpr Lambda

◆ LBAL_CPP17_DEDUCTION_GUIDES

#define LBAL_CPP17_DEDUCTION_GUIDES

Template argument deduction for class templates.

SD-6 equivalent: __cpp_deduction_guides >= 201606L. Note that __cpp_deduction_guides has multiple values associated with it from a number of different proposals, so this token will have the value of the latest supported proposal, or 0 if the proposal described here is not supported.

201606L P0091R3 Template argument deduction for class templates (Rev. 6)

◆ LBAL_CPP17_DEDUCTION_GUIDES_DR

#define LBAL_CPP17_DEDUCTION_GUIDES_DR

Address additional class template argument deduction issues.

SD-6 equivalent: __cpp_deduction_guides >= 201703L. Note that __cpp_deduction_guides has multiple values associated with it from a number of different proposals, so this token will have the value of the latest supported proposal, or 0 if the proposal described here is not supported.

201703L P0620R0 Drafting for class template argument deduction issues

◆ LBAL_CPP17_DEDUCTION_GUIDES_NB

#define LBAL_CPP17_DEDUCTION_GUIDES_NB

Address issues that came up during C++17 balloting regarding class template argument deduction.

SD-6 equivalent: __cpp_deduction_guides >= 201611L. Note that __cpp_deduction_guides has multiple values associated with it from a number of different proposals, so this token will have the value of the latest supported proposal, or 0 if the proposal described here is not supported.

201611L P0512R0 PDF Class Template Argument Deduction Assorted NB resolution and issues

◆ LBAL_CPP17_ENUMERATOR_ATTRIBUTES

#define LBAL_CPP17_ENUMERATOR_ATTRIBUTES

Attributes for enumerators.

SD-6 equivalent: __cpp_enumerator_attributes >= 201411L. This token will have a value of 0 if the proposal described here is not supported.

201411L N4266 Attributes for namespaces and enumerators

◆ LBAL_CPP17_FOLD_EXPRESSIONS

#define LBAL_CPP17_FOLD_EXPRESSIONS

Allow folding a template parameter pack over a binary operator.

SD-6 equivalent: __cpp_fold_expressions >= 201411L. Note that __cpp_fold_expressions has multiple values associated with it from a number of different proposals, so this token will have the value of the latest supported proposal, or 0 if the proposal described here is not supported.

201411L N4295 Folding Expressions

◆ LBAL_CPP17_FOLD_EXPRESSIONS_REVISED

#define LBAL_CPP17_FOLD_EXPRESSIONS_REVISED

Add support for unary folds and empty parameter packs to fold expressions.

SD-6 equivalent: __cpp_fold_expressions >= 201603L. Note that __cpp_fold_expressions has multiple values associated with it from a number of different proposals, so this token will have the value of the latest supported proposal, or 0 if the proposal described here is not supported.

201603L P0036R0 PDF Unary Folds and Empty Parameter Packs (Revision 1)

◆ LBAL_CPP17_GUARANTEED_COPY_ELISION

#define LBAL_CPP17_GUARANTEED_COPY_ELISION

Guarantee copy and move elision in well-defined situations.

SD-6 equivalent: __cpp_guaranteed_copy_elision >= 201606L. This token will have a value of 0 if the proposal described here is not supported.

201606L P0135R1 Wording for guaranteed copy elision through simplified value categories

◆ LBAL_CPP17_HEX_FLOAT

#define LBAL_CPP17_HEX_FLOAT

Specify Hexadecimal float literals.

SD-6 equivalent: __cpp_hex_float >= 201603L. This token will have a value of 0 if the proposal described here is not supported.

201603L P0245R1 Hexadecimal float literals for C++

◆ LBAL_CPP17_IF_CONSTEXPR

#define LBAL_CPP17_IF_CONSTEXPR

Allow constant expressions as if statements.

SD-6 equivalent: __cpp_if_constexpr >= 201606L. This token will have a value of 0 if the proposal described here is not supported.

201606L P0292R2 constexpr if: A slightly different syntax

◆ LBAL_CPP17_INHERITING_CONSTRUCTORS_REVISED

#define LBAL_CPP17_INHERITING_CONSTRUCTORS_REVISED

Address core issues raised by Inheriting Constructors.

SD-6 equivalent: __cpp_inheriting_constructors >= 201511L. Note that __cpp_inheriting_constructors has multiple values associated with it from a number of different proposals, so this token will have the value of the latest supported proposal, or 0 if the proposal described here is not supported.

201511L P0136R1 Rewording inheriting constructors (core issue 1941 et al)

◆ LBAL_CPP17_INLINE_VARIABLES

#define LBAL_CPP17_INLINE_VARIABLES

inline variables

SD-6 equivalent: __cpp_inline_variables >= 201606L. This token will have a value of 0 if the proposal described here is not supported.

201606L P0386R2 PDF Inline Variables

◆ LBAL_CPP17_NAMESPACE_ATTRIBUTES

#define LBAL_CPP17_NAMESPACE_ATTRIBUTES

Attributes for namespaces.

SD-6 equivalent: __cpp_namespace_attributes >= 201411L. This token will have a value of 0 if the proposal described here is not supported.

201411L N4266 Attributes for namespaces and enumerators

◆ LBAL_CPP17_NOEXCEPT_FUNCTION_TYPE

#define LBAL_CPP17_NOEXCEPT_FUNCTION_TYPE

Make exception specifications be part of the type system.

SD-6 equivalent: __cpp_noexcept_function_type >= 201510L. This token will have a value of 0 if the proposal described here is not supported.

201510L P0012R1 Make exception specifications be part of the type system, version 5

◆ LBAL_CPP17_NONTYPE_TEMPLATE_ARGS

#define LBAL_CPP17_NONTYPE_TEMPLATE_ARGS

Allow constant evaluation for all non-type template arguments.

SD-6 equivalent: __cpp_nontype_template_args >= 201411L. Note that __cpp_nontype_template_args has multiple values associated with it from a number of different proposals, so this token will have the value of the latest supported proposal, or 0 if the proposal described here is not supported.

201411L N4268 Allow constant evaluation for all non-type template arguments

◆ LBAL_CPP17_NONTYPE_TEMPLATE_PARAMETER_AUTO

#define LBAL_CPP17_NONTYPE_TEMPLATE_PARAMETER_AUTO

Allow declaring non-type template arguments with auto.

SD-6 equivalent: __cpp_nontype_template_parameter_auto >= 201606L. This token will have a value of 0 if the proposal described here is not supported.

201606L P0127R2 Declaring non-type template arguments with auto

◆ LBAL_CPP17_RANGE_BASED_FOR_GENERALIZED

#define LBAL_CPP17_RANGE_BASED_FOR_GENERALIZED

Generalize range-based for-loops.

SD-6 equivalent: __cpp_range_based_for >= 201603L. Note that __cpp_range_based_for has multiple values associated with it from a number of different proposals, so this token will have the value of the latest supported proposal, or 0 if the proposal described here is not supported.

201603L P0184R0 Generalizing the Range-Based For Loop

◆ LBAL_CPP17_STATIC_ASSERT_NO_MESSAGE

#define LBAL_CPP17_STATIC_ASSERT_NO_MESSAGE

Allow static assertions with no messages.

SD-6 equivalent: __cpp_static_assert >= 201411L. Note that __cpp_static_assert has multiple values associated with it from a number of different proposals, so this token will have the value of the latest supported proposal, or 0 if the proposal described here is not supported.

201411L N3928 Extending static_assert, v2

◆ LBAL_CPP17_STRUCTURED_BINDINGS

#define LBAL_CPP17_STRUCTURED_BINDINGS

Add support for multiple function return values and more.

SD-6 equivalent: __cpp_structured_bindings >= 201606L. Note that __cpp_structured_bindings has multiple values associated with it from a number of different proposals, so this token will have the value of the latest supported proposal, or 0 if the proposal described here is not supported.

201606L P0217R3 Proposed wording for structured bindings

◆ LBAL_CPP17_TEMPLATE_TEMPLATE_ARGS

#define LBAL_CPP17_TEMPLATE_TEMPLATE_ARGS

Resolve a defect in the matching of template arguments with template parameters.

SD-6 equivalent: __cpp_template_template_args >= 201611L. This token will have a value of 0 if the proposal described here is not supported.

201611L P0522R0 DR: Matching of template template-arguments excludes compatible templates

Remarks: The proposal this is from is intended to resolve a Defect Report, but unfortunately introduces a defect of its own. Some compilers are disabling this until a revised patch is in.

◆ LBAL_CPP17_VARIADIC_USING

#define LBAL_CPP17_VARIADIC_USING

Add support for pack expansions in using-declarations.

SD-6 equivalent: __cpp_variadic_using >= 201611L. This token will have a value of 0 if the proposal described here is not supported.

201611L P0195R2 Pack expansions in using- declarations

◆ LBAL_CPP20_AGGREGATE_PAREN_INIT

#define LBAL_CPP20_AGGREGATE_PAREN_INIT

Allow aggregate initialization from parentheses as well as braces.

SD-6 equivalent: __cpp_aggregate_paren_init >= 201902L. This token will have a value of 0 if the proposal described here is not supported.

201902L P0960R3 Allow initializing aggregates from a parenthesized list of values

Remarks: Note that paren initialization allows narrowing conversions, as usual.

◆ LBAL_CPP20_ATTRIBUTE_LIKELY

#define LBAL_CPP20_ATTRIBUTE_LIKELY

Add likely attribute for labels and statements.

SD-6 equivalent: __has_cpp_attribute(likely) >= 201803L. This token will have a value of 0 if the proposal described here is not supported.

201803L P0479R5 Proposed wording for likely and unlikely attributes

◆ LBAL_CPP20_ATTRIBUTE_NO_UNIQUE_ADDRESS

#define LBAL_CPP20_ATTRIBUTE_NO_UNIQUE_ADDRESS

Add language support for for empty objects.

SD-6 equivalent: __has_cpp_attribute(no_unique_address) >= 201803L. This token will have a value of 0 if the proposal described here is not supported.

201803L P0840R2 Language support for empty objects

◆ LBAL_CPP20_ATTRIBUTE_NODISCARD_EXPANDED

#define LBAL_CPP20_ATTRIBUTE_NODISCARD_EXPANDED

Add explanatory text to the nodiscard attribute and allow it on constructors.

SD-6 equivalent: __has_cpp_attribute(nodiscard) >= 201907L. Note that __has_cpp_attribute(nodiscard) has multiple values associated with it from a number of different proposals, so this token will have the value of the latest supported proposal, or 0 if the proposal described here is not supported.

201907L P1301R4 [[nodiscard(should have a reason)]]
201907L P1771R1 PDF [[nodiscard]] for constructors

◆ LBAL_CPP20_ATTRIBUTE_UNLIKELY

#define LBAL_CPP20_ATTRIBUTE_UNLIKELY

Add unlikely attribute for labels and statements.

SD-6 equivalent: __has_cpp_attribute(unlikely) >= 201803L. This token will have a value of 0 if the proposal described here is not supported.

201803L P0479R5 Proposed wording for likely and unlikely attributes

◆ LBAL_CPP20_ATTRIBUTES_LIKELY_AND_UNLIKELY

#define LBAL_CPP20_ATTRIBUTES_LIKELY_AND_UNLIKELY

Aggregate tracking the availability of likely and unlikely attributes.

We track the availability of each attribute separately, as well as provide this aggregate to test for compliance. The aggregate’s value will be 0 if either attribute is unavailable, or 1 otherwise.

◆ LBAL_CPP20_CHAR8_T

#define LBAL_CPP20_CHAR8_T

Add char8_t as a UTF-8 equivalent for char16_t and char32_t.

SD-6 equivalent: __cpp_char8_t >= 201811L. Note that __cpp_char8_t has multiple values associated with it from a number of different proposals, so this token will have the value of the latest supported proposal, or 0 if the proposal described here is not supported.

201811L P0482R6 char8_t: A type for UTF-8 characters and strings (Revision 6)

◆ LBAL_CPP20_CONCEPTS

#define LBAL_CPP20_CONCEPTS

Incorporate the Concepts TS into the Standard.

SD-6 equivalent: __cpp_concepts >= 201707L. Note that __cpp_concepts has multiple values associated with it from a number of different proposals, so this token will have the value of the latest supported proposal, or 0 if the proposal described here is not supported.

201707L P0734R0 PDF Wording Paper, C++ extensions for Concepts

◆ LBAL_CPP20_CONCEPTS_CONDITIONALLY_TRIVIAL_SPECIAL_MEMBER_FUNCTIONS

#define LBAL_CPP20_CONCEPTS_CONDITIONALLY_TRIVIAL_SPECIAL_MEMBER_FUNCTIONS

Make special member functions conditionally trivial.

SD-6 equivalent: __cpp_concepts >= 202002L. Note that __cpp_concepts has multiple values associated with it from a number of different proposals, so this token will have the value of the latest supported proposal, or 0 if the proposal described here is not supported.

202002L P0848R3 Conditionally Trivial Special Member Functions

◆ LBAL_CPP20_CONCEPTS_REFINE_RETURN_TYPE_REQUIREMENTS

#define LBAL_CPP20_CONCEPTS_REFINE_RETURN_TYPE_REQUIREMENTS

Refine definition of return-type-requirements.

SD-6 equivalent: __cpp_concepts >= 201907L. Note that __cpp_concepts has multiple values associated with it from a number of different proposals, so this token will have the value of the latest supported proposal, or 0 if the proposal described here is not supported.

201907L P1452R2 On the non-uniform semantics of return-type-requirements

◆ LBAL_CPP20_CONCEPTS_RESPECIFY_RETURN_TYPE_REQUIREMENTS

#define LBAL_CPP20_CONCEPTS_RESPECIFY_RETURN_TYPE_REQUIREMENTS

Refine definition of return-type-requirements.

SD-6 equivalent: __cpp_concepts >= 201811L. Note that __cpp_concepts has multiple values associated with it from a number of different proposals, so this token will have the value of the latest supported proposal, or 0 if the proposal described here is not supported.

201811L P1084R2 PDF Today’s return-type- requirements Are Insufficient

◆ LBAL_CPP20_CONDITIONAL_EXPLICIT

#define LBAL_CPP20_CONDITIONAL_EXPLICIT

Support explicit (bool).

Allow simplification of templated constructors that have the potential to incorrectly convert their arguments.

SD-6 equivalent: __cpp_conditional_explicit >= 201806L. This token will have a value of 0 if the proposal described here is not supported.

201806L P0892R2 explicit(bool)

◆ LBAL_CPP20_CONSTEVAL

#define LBAL_CPP20_CONSTEVAL

Immediate functions.

SD-6 equivalent: __cpp_consteval >= 201811L. Note that __cpp_consteval has multiple values associated with it from a number of different proposals, so this token will have the value of the latest supported proposal, or 0 if the proposal described here is not supported.

201811L P1073R3 Immediate functions

◆ LBAL_CPP20_CONSTEXPR_CHANGE_ACTIVE_UNION_MEMBER

#define LBAL_CPP20_CONSTEXPR_CHANGE_ACTIVE_UNION_MEMBER

Allow the active member of a union inside constexpr to change.

SD-6 equivalent: __cpp_constexpr >= 202002L. Note that __cpp_constexpr has multiple values associated with it from a number of different proposals, so this token will have the value of the latest supported proposal, or 0 if the proposal described here is not supported.

202002L P1330R0 PDF Changing the active member of a union inside constexpr

◆ LBAL_CPP20_CONSTEXPR_DYNAMIC_ALLOC

#define LBAL_CPP20_CONSTEXPR_DYNAMIC_ALLOC

Language support for variable-sized containers suitable for use in constexpr computations.

SD-6 equivalent: __cpp_constexpr_dynamic_alloc >= 201907L. This token will have a value of 0 if the proposal described here is not supported.

201907L P0784R7 More constexpr containers

Remarks: AKA, “More constexpr containers”.

◆ LBAL_CPP20_CONSTEXPR_DYNAMIC_POLYMORPHISM

#define LBAL_CPP20_CONSTEXPR_DYNAMIC_POLYMORPHISM

Allow dynamic_cast, polymorphic typeid in constexpr functions.

SD-6 equivalent: __cpp_constexpr >= 201811L. Note that __cpp_constexpr has multiple values associated with it from a number of different proposals, so this token will have the value of the latest supported proposal, or 0 if the proposal described here is not supported.

201811L P1002R1 Try-catch blocks in constexpr functions
201811L P1327R1 Allowing dynamic_cast, polymorphic typeid in Constant Expressions

Remarks: This and the LBAL_CPP20_CONSTEXPR_TRY_CATCH and LBAL_CPP20_CONSTEXPR_UNION_ALTERATION tokens are aliases for each other.

◆ LBAL_CPP20_CONSTEXPR_IN_DECLTYPE

#define LBAL_CPP20_CONSTEXPR_IN_DECLTYPE

Address Core Issue regarding when constexpr functions are defined.

This has the effect of allowing constant expressions in decltype declarations.

SD-6 equivalent: __cpp_constexpr_in_decltype >= 201711L. This token will have a value of 0 if the proposal described here is not supported.

201711L P0859R0 Core Issue 1581: When are constexpr member functions defined?

◆ LBAL_CPP20_CONSTEXPR_INTRINSICS

#define LBAL_CPP20_CONSTEXPR_INTRINSICS

Permit unevaluated inline assembly in constexpr functions.

SD-6 equivalent: __cpp_constexpr >= 201907L. Note that __cpp_constexpr has multiple values associated with it from a number of different proposals, so this token will have the value of the latest supported proposal, or 0 if the proposal described here is not supported.

201907L P1668R1 Enabling constexpr Intrinsics By Permitting Unevaluated inline-assembly in constexpr Functions

Remarks: This and the LBAL_CPP20_CONSTEXPR_TRIVIAL_DEFAULT_INITIALIZATION token are aliases for each other.

◆ LBAL_CPP20_CONSTEXPR_TRIVIAL_DEFAULT_INITIALIZATION

#define LBAL_CPP20_CONSTEXPR_TRIVIAL_DEFAULT_INITIALIZATION

Address an inconsistency in the lambda specification.

SD-6 equivalent: __cpp_constexpr >= 201907L. Note that __cpp_constexpr has multiple values associated with it from a number of different proposals, so this token will have the value of the latest supported proposal, or 0 if the proposal described here is not supported.

201907L P1331R2 Permitting trivial default initialization in constexpr contexts

Remarks: This and the LBAL_CPP20_CONSTEXPR_INTRINSICS token are aliases for each other.

◆ LBAL_CPP20_CONSTEXPR_TRY_CATCH

#define LBAL_CPP20_CONSTEXPR_TRY_CATCH

Permit unevaluated inline assembly in constexpr functions.

SD-6 equivalent: __cpp_constexpr >= 201811L. Note that __cpp_constexpr has multiple values associated with it from a number of different proposals, so this token will have the value of the latest supported proposal, or 0 if the proposal described here is not supported.

201811L P1002R1 Try-catch blocks in constexpr functions

Remarks: This and the LBAL_CPP20_CONSTEXPR_DYNAMIC_POLYMORPHISM and LBAL_CPP20_CONSTEXPR_UNION_ALTERATION tokens are aliases for each other.

◆ LBAL_CPP20_CONSTEXPR_UNION_ALTERATION

#define LBAL_CPP20_CONSTEXPR_UNION_ALTERATION

Allow changing the active member of a union inside constexpr.

SD-6 equivalent: __cpp_constexpr >= 201811L. Note that __cpp_constexpr has multiple values associated with it from a number of different proposals, so this token will have the value of the latest supported proposal, or 0 if the proposal described here is not supported.

202002L P1330R0 PDF Changing the active member of a union inside constexpr

Remarks: This and the LBAL_CPP20_CONSTEXPR_TRY_CATCH and LBAL_CPP20_CONSTEXPR_DYNAMIC_POLYMORPHISM tokens are aliases for each other.

◆ LBAL_CPP20_CONSTEXPR_VIRTUAL_FUNCTION

#define LBAL_CPP20_CONSTEXPR_VIRTUAL_FUNCTION

Allow virtual function calls in constexpr functions.

SD-6 equivalent: __cpp_constexpr >= 201806L. Note that __cpp_constexpr has multiple values associated with it from a number of different proposals, so this token will have the value of the latest supported proposal, or 0 if the proposal described here is not supported.

201806L P1064R0 Allowing Virtual Function Calls in Constant Expressions

◆ LBAL_CPP20_CONSTINIT

#define LBAL_CPP20_CONSTINIT

Add the constinit keyword.

This keyword provides a decorator that can be used to ensure that initialization of a constant is actually occuring as expected, regardless of any changing (i.e., dialect-specific) rules that might be in play.

SD-6 equivalent: __cpp_constinit >= 201907L. This token will have a value of 0 if the proposal described here is not supported.

201907L P1143R2 Adding the constinit keyword

Remarks

This feature is broadly intended to be back-portable to older C+

dialects; in certain circumstances it’s conceivable that __cpp_constinit will be set even if the dialect is older than C++20.

◆ LBAL_CPP20_DEDUCTION_GUIDES_FOR_AGGREGATES

#define LBAL_CPP20_DEDUCTION_GUIDES_FOR_AGGREGATES

Class template argument deduction for aggregates.

SD-6 equivalent: __cpp_deduction_guides >= 201907L. Note that __cpp_deduction_guides has multiple values associated with it from a number of different proposals, so this token will have the value of the latest supported proposal, or 0 if the proposal described here is not supported.

201907L P1814R0 Wording for Class Template Argument Deduction for Alias Templates
201907L P1816R0 PDF Wording for class template argument deduction for aggregates

◆ LBAL_CPP20_DESIGNATED_INITIALIZERS

#define LBAL_CPP20_DESIGNATED_INITIALIZERS

Add designated initializers.

SD-6 equivalent: __cpp_designated_initializers >= 201707L. Note that __cpp_designated_initializers has multiple values associated with it from a number of different proposals, so this token will have the value of the latest supported proposal, or 0 if the proposal described here is not supported.

201707L P0329R4 PDF Designated Initialization Wording

◆ LBAL_CPP20_DESTROYING_DELETE

#define LBAL_CPP20_DESTROYING_DELETE

Efficient sized delete for variable sized classes.

SD-6 equivalent: __cpp_impl_destroying_delete >= 201806L. This token will have a value of 0 if the proposal described here is not supported.

201806L P0722R3 Efficient sized delete for variable sized classes

◆ LBAL_CPP20_GENERIC_LAMBDAS_TEMPLATE_PARAMETER_LIST

#define LBAL_CPP20_GENERIC_LAMBDAS_TEMPLATE_PARAMETER_LIST

Generic (Polymorphic) Lambda Expressions.

SD-6 equivalent: __cpp_generic_lambdas >= 201707L. Note that __cpp_generic_lambdas has multiple values associated with it from a number of different proposals, so this token will have the value of the latest supported proposal, or 0 if the proposal described here is not supported.

201707L P0428R2 Familiar template syntax for generic lambdas

◆ LBAL_CPP20_IMPL_COROUTINE

#define LBAL_CPP20_IMPL_COROUTINE

Add necessary language support for the <coroutine> library feature.

SD-6 equivalent: __cpp_impl_coroutine >= 201902L. Note that __cpp_impl_coroutine has multiple values associated with it from a number of different proposals, so this token will have the value of the latest supported proposal, or 0 if the proposal described here is not supported.

201902L LWG3393 Missing/incorrect feature test macro for coroutines
201902L P0912R5 Merge Coroutines TS into C+ +20 working draft

Remarks: Technically, the proposal this is from only directs that the Coroutines TS be merged into the Standard.

◆ LBAL_CPP20_INIT_CAPTURES_PACK_EXPANSION

#define LBAL_CPP20_INIT_CAPTURES_PACK_EXPANSION

Allow pack-expansion in lambda init-capture.

SD-6 equivalent: __cpp_init_captures >= 201803L. Note that __cpp_init_captures has multiple values associated with it from a number of different proposals, so this token will have the value of the latest supported proposal, or 0 if the proposal described here is not supported.

201803L P0780R2 Allow pack expansion in lambda init-capture

◆ LBAL_CPP20_INTEGRATING_OUR_FEATURE_TEST_MACROS

#define LBAL_CPP20_INTEGRATING_OUR_FEATURE_TEST_MACROS

Integrate universal feature test macros into the Standard.

Remarks: It appears this is only here to get Microsoft to support SD-6, as the other major compilers de facto meet the requirement.

◆ LBAL_CPP20_MODULES

#define LBAL_CPP20_MODULES

Incorporate modules.

SD-6 equivalent: __cpp_modules >= 201907L. This token will have a value of 0 if the proposal described here is not supported.

201907L P1103R3 PDF Merging Modules
201907L P1811R0 Relaxing redefinition restrictions for re-exportation robustness

◆ LBAL_CPP20_NONTYPE_TEMPLATE_ARGS_FIXES

#define LBAL_CPP20_NONTYPE_TEMPLATE_ARGS_FIXES

Address inconsistencies in handling of non-type template arguments.

SD-6 equivalent: __cpp_nontype_template_args >= 201911L. Note that __cpp_nontype_template_args has multiple values associated with it from a number of different proposals, so this token will have the value of the latest supported proposal, or 0 if the proposal described here is not supported.

201911L P1907R1 Inconsistencies with non-type template parameters

Remarks: Most mainstream compilers support this, except for float-type arguments, but there is no “partial support” value to qualify this. The latest versions of some compilers even support floats “experimentally”, but have not yet updated the macro value.

◆ LBAL_CPP20_NONTYPE_TEMPLATE_PARAMETER_CLASS

#define LBAL_CPP20_NONTYPE_TEMPLATE_PARAMETER_CLASS

Class Types in Non-Type Template Parameters.

SD-6 equivalent: __cpp_nontype_template_parameter_class >= 201806L. This token will have a value of 0 if the proposal described here is not supported.

201806L P0732R2 PDF Class Types in Non- Type Template Parameters

◆ LBAL_CPP20_THREE_WAY_COMPARISON_OPERATOR

#define LBAL_CPP20_THREE_WAY_COMPARISON_OPERATOR

This is the original three-way comparison operator.

SD-6 equivalent: __cpp_impl_three_way_comparison >= 201711L. Note that __cpp_impl_three_way_comparison has multiple values associated with it from a number of different proposals, so this token will have the value of the latest supported proposal, or 0 if the proposal described here is not supported.

201711L P0515R3 PDF Consistent comparison
201711L P0768R1 PDF Library Support for the Spaceship (Comparison) Operator

◆ LBAL_CPP20_THREE_WAY_COMPARISON_OPERATOR_EQUALITY_FIX

#define LBAL_CPP20_THREE_WAY_COMPARISON_OPERATOR_EQUALITY_FIX

This is the original three-way comparison operator.

SD-6 equivalent: __cpp_impl_three_way_comparison >= 201902L. Note that __cpp_impl_three_way_comparison has multiple values associated with it from a number of different proposals, so this token will have the value of the latest supported proposal, or 0 if the proposal described here is not supported.

201902L P1185R2 <=> != ==

◆ LBAL_CPP20_THREE_WAY_COMPARISON_OPERATOR_TUNEUP

#define LBAL_CPP20_THREE_WAY_COMPARISON_OPERATOR_TUNEUP

This is the updated three-way comparison operator.

SD-6 equivalent: __cpp_impl_three_way_comparison >= 201907L. Note that __cpp_impl_three_way_comparison has multiple values associated with it from a number of different proposals, so this token will have the value of the latest supported proposal, or 0 if the proposal described here is not supported.

201907L P1630R1 Spaceship needs a tune-up

◆ LBAL_CPP20_USING_ENUM

#define LBAL_CPP20_USING_ENUM

Specify using aliases for enums.

SD-6 equivalent: __cpp_using_enum >= 201907L. This token will have a value of 0 if the proposal described here is not supported.

201907L P1099R5 Using Enum

◆ LBAL_CPP20_VA_OPT

#define LBAL_CPP20_VA_OPT

Provide a smarter predefined macro equivalent to VA__ARGS.

This behaves similarly to Microsoft’s old “broken” C preprocessor implementation in regards to variadic macro handling, in that [0..n] arguments are allowed rather than [1..n], with any extraneous comma being dropped.

Remarks: Ironically, MSVC has no implementation of this.

◆ LBAL_CPP23_ATTRIBUTE_ASSUME

#define LBAL_CPP23_ATTRIBUTE_ASSUME

Optimization hint to indicate an expression is true.

SD-6 equivalent: __has_cpp_attribute(assume) >= 202207L. This token will have a value of 0 if the proposal described here is not supported.

202207L CWG2615 Missing has_cpp_attribute(assume)
202207L [P1774R8 __PDF](https://wg21.link/P1774R8) Portable assumptions

◆ LBAL_CPP23_AUTO_CAST

#define LBAL_CPP23_AUTO_CAST

auto(x): decay-copy in the language

SD-6 equivalent: __cpp_auto_cast >= 202110L. This token will have a value of 0 if the proposal described here is not supported.

202110L P0849R8 auto(x): decay-copy in the language

◆ LBAL_CPP23_CHAR8_T_COMPATIBILITY

#define LBAL_CPP23_CHAR8_T_COMPATIBILITY

char8_t Compatibility and Portability Fix

SD-6 equivalent: __cpp_char8_t >= 202207L. Note that __cpp_char8_t has multiple values associated with it from a number of different proposals, so this token will have the value of the latest supported proposal, or 0 if the proposal described here is not supported.

202207L P2513R3 char8_t Compatibility and Portability Fix

◆ LBAL_CPP23_CONSTEVAL_PROPAGATE_UP

#define LBAL_CPP23_CONSTEVAL_PROPAGATE_UP

consteval needs to propagate up

SD-6 equivalent: __cpp_consteval >= 202211L. Note that __cpp_consteval has multiple values associated with it from a number of different proposals, so this token will have the value of the latest supported proposal, or 0 if the proposal described here is not supported.

202211L P2564R3 consteval needs to propagate up

◆ LBAL_CPP23_CONSTEXPR_NON_LITERAL_VARIABLES

#define LBAL_CPP23_CONSTEXPR_NON_LITERAL_VARIABLES

Allow non-literal variables, labels, and gotos in constexpr functions.

SD-6 equivalent: __cpp_constexpr >= 202110L. Note that __cpp_constexpr has multiple values associated with it from a number of different proposals, so this token will have the value of the latest supported proposal, or 0 if the proposal described here is not supported.

202110L P2242R3 Non-literal variables (and labels and gotos) in constexpr functions

◆ LBAL_CPP23_CONSTEXPR_PERMIT_STATIC_CONSTEXPR

#define LBAL_CPP23_CONSTEXPR_PERMIT_STATIC_CONSTEXPR

Permit static constexpr variables in constexpr functions.

SD-6 equivalent: __cpp_constexpr >= 202211L. Note that __cpp_constexpr has multiple values associated with it from a number of different proposals, so this token will have the value of the latest supported proposal, or 0 if the proposal described here is not supported.

202211L P2647R1 Permitting static constexpr variables in constexpr functions

◆ LBAL_CPP23_CONSTEXPR_RELAX_RESTRICTIONS

#define LBAL_CPP23_CONSTEXPR_RELAX_RESTRICTIONS

Relax some constexpr restrictions.

SD-6 equivalent: __cpp_constexpr >= 202207L. Note that __cpp_constexpr has multiple values associated with it from a number of different proposals, so this token will have the value of the latest supported proposal, or 0 if the proposal described here is not supported.

202207L P2448R2 Relaxing some constexpr restrictions

◆ LBAL_CPP23_DEDUCTION_GUIDES_FROM_INHERITED_CONSTRUCTORS

#define LBAL_CPP23_DEDUCTION_GUIDES_FROM_INHERITED_CONSTRUCTORS

Allow class template argument deduction from inherited constructors.

SD-6 equivalent: __cpp_deduction_guides >= 202207L. Note that __cpp_deduction_guides has multiple values associated with it from a number of different proposals, so this token will have the value of the latest supported proposal, or 0 if the proposal described here is not supported.

202207L P2582R1 PDF Wording for class template argument deduction from inherited constructors

◆ LBAL_CPP23_EXPLICIT_THIS_PARAMETER

#define LBAL_CPP23_EXPLICIT_THIS_PARAMETER

Deduce this.

SD-6 equivalent: __cpp_explicit_this_parameter >= 202110L. This token will have a value of 0 if the proposal described here is not supported.

202110L P0847R7 Deducing this

◆ LBAL_CPP23_IF_CONSTEVAL

#define LBAL_CPP23_IF_CONSTEVAL

if consteval

SD-6 equivalent: __cpp_if_consteval >= 202106L. This token will have a value of 0 if the proposal described here is not supported.

202106L P1938R3 if consteval

◆ LBAL_CPP23_IMPLICIT_MOVE

#define LBAL_CPP23_IMPLICIT_MOVE

Simpler implicit move.

SD-6 equivalent: __cpp_implicit_move >= 202207L. This token will have a value of 0 if the proposal described here is not supported.

202207L P2266R3 Simpler implicit move

◆ LBAL_CPP23_MULTIDIMENSIONAL_SUBSCRIPT

#define LBAL_CPP23_MULTIDIMENSIONAL_SUBSCRIPT

Add a multidimensional subscript operator.

SD-6 equivalent: __cpp_multidimensional_subscript >= 202110L. Note that __cpp_multidimensional_subscript has multiple values associated with it from a number of different proposals, so this token will have the value of the latest supported proposal, or 0 if the proposal described here is not supported.

202110L P2128R6 PDF Multidimensional subscript operator

◆ LBAL_CPP23_MULTIDIMENSIONAL_SUBSCRIPT_STATIC

#define LBAL_CPP23_MULTIDIMENSIONAL_SUBSCRIPT_STATIC

static operator []

SD-6 equivalent: __cpp_multidimensional_subscript >= 202211L. Note that __cpp_multidimensional_subscript has multiple values associated with it from a number of different proposals, so this token will have the value of the latest supported proposal, or 0 if the proposal described here is not supported.

202211L P2589R1 PDF static operator[]

◆ LBAL_CPP23_NAMED_CHARACTER_ESCAPES

#define LBAL_CPP23_NAMED_CHARACTER_ESCAPES

Add named universal character escapes.

SD-6 equivalent: __cpp_named_character_escapes >= 202207L. This token will have a value of 0 if the proposal described here is not supported.

202207L P2071R2 Named universal character escapes

◆ LBAL_CPP23_RANGE_BASED_FOR_TEMPORARIES

#define LBAL_CPP23_RANGE_BASED_FOR_TEMPORARIES

Allow some temporaries in range-based for-loops.

SD-6 equivalent: __cpp_range_based_for >= 202211L. Note that __cpp_range_based_for has multiple values associated with it from a number of different proposals, so this token will have the value of the latest supported proposal, or 0 if the proposal described here is not supported.

202211L CWG2659 Missing feature-test macro for lifetime extension in range-for loop
202211L P2644R1 PDF Final Fix of Broken Range based for Loop Rev 1
202211L P2718R0 PDF Wording for P2644R1 Fix for Range-based for Loop

◆ LBAL_CPP23_SIZE_T_SUFFIX

#define LBAL_CPP23_SIZE_T_SUFFIX

Add literal suffixes for (signed) size_t.

SD-6 equivalent: __cpp_size_t_suffix >= 202011L. This token will have a value of 0 if the proposal described here is not supported.

202011L P0330R8 Literal Suffixes for (signed) size_t

◆ LBAL_CPP23_STATIC_CALL_OPERATOR

#define LBAL_CPP23_STATIC_CALL_OPERATOR

Static operator ().

SD-6 equivalent: __cpp_static_call_operator >= 202207L. This token will have a value of 0 if the proposal described here is not supported.

202207L P1169R4 static operator()

◆ LBAL_CPP26_ATTRIBUTE_INDETERMINATE

#define LBAL_CPP26_ATTRIBUTE_INDETERMINATE

Erroneous behaviour for uninitialized reads.

SD-6 equivalent: __has_cpp_attribute(indeterminate) >= 202403L. This token will have a value of 0 if the proposal described here is not supported.

202403L P2795R5 Erroneous behaviour for uninitialized reads

◆ LBAL_CPP26_CONSTEXPR_CAST_FROM_VOID_STAR

#define LBAL_CPP26_CONSTEXPR_CAST_FROM_VOID_STAR

All constexpr cast from void *.

SD-6 equivalent: __cpp_constexpr >= 202306L. Note that __cpp_constexpr has multiple values associated with it from a number of different proposals, so this token will have the value of the latest supported proposal, or 0 if the proposal described here is not supported.

202306L P2738R1 PDF constexpr cast from void*: towards constexpr type-erasure

◆ LBAL_CPP26_CONSTEXPR_EXCEPTIONS

#define LBAL_CPP26_CONSTEXPR_EXCEPTIONS

Allow exception throwing in constant-evaluation.

SD-6 equivalent: __cpp_constexpr_exceptions >= 202411L. This token will have a value of 0 if the proposal described here is not supported.

202411L P3068R6 Allowing exception throwing in constant-evaluation

◆ LBAL_CPP26_CONSTEXPR_PLACEMENT_NEW

#define LBAL_CPP26_CONSTEXPR_PLACEMENT_NEW

Add constexpr placement new.

SD-6 equivalent: __cpp_constexpr >= 202406L. Note that __cpp_constexpr has multiple values associated with it from a number of different proposals, so this token will have the value of the latest supported proposal, or 0 if the proposal described here is not supported.

202406L P2747R2 constexpr placement new

◆ LBAL_CPP26_CONSTEXPR_VIRTUAL_INHERITANCE

#define LBAL_CPP26_CONSTEXPR_VIRTUAL_INHERITANCE

Allow exception throwing in constant-evaluation.

SD-6 equivalent: __cpp_constexpr_virtual_inheritance >= 202506L. This token will have a value of 0 if the proposal described here is not supported.

202506L P3533R2 constexpr virtual inheritance

◆ LBAL_CPP26_CONTRACTS

#define LBAL_CPP26_CONTRACTS

Contracts for C++.

SD-6 equivalent: __cpp_contracts >= 202502L. Note that __cpp_contracts has multiple values associated with it from a number of different proposals, so this token will have the value of the latest supported proposal, or 0 if the proposal described here is not supported.

202502L P2900R14 PDF Contracts for C++

◆ LBAL_CPP26_DELETED_FUNCTION

#define LBAL_CPP26_DELETED_FUNCTION

= delete(\should have a reason\).

SD-6 equivalent: __cpp_deleted_function >= 202403L. This token will have a value of 0 if the proposal described here is not supported.

202403L P2573R2 = delete(“should have a reason”);

◆ LBAL_CPP26_EXPANSION_STATEMENTS

#define LBAL_CPP26_EXPANSION_STATEMENTS

Expansion statements.

SD-6 equivalent: __cpp_expansion_statements >= 202506L. This token will have a value of 0 if the proposal described here is not supported.

202506L P1306R5 Expansion statements

◆ LBAL_CPP26_IMPL_REFLECTION

#define LBAL_CPP26_IMPL_REFLECTION

Reflection for C++26.

SD-6 equivalent: __cpp_impl_reflection >= 202506L. Note that __cpp_impl_reflection has multiple values associated with it from a number of different proposals, so this token will have the value of the latest supported proposal, or 0 if the proposal described here is not supported.

202506L P2996R13 Reflection for C++26
202506L P3096R12 PDF Function Parameter Reflection in Reflection for C++26
202506L P3293R3 Splicing a base class subobject
202506L P3394R4 Annotations for Reflection

◆ LBAL_CPP26_IMPL_REFLECTION_CLEANUP

#define LBAL_CPP26_IMPL_REFLECTION_CLEANUP

Miscellaneous Reflection Cleanup.

SD-6 equivalent: __cpp_impl_reflection >= 202603L. Note that __cpp_impl_reflection has multiple values associated with it from a number of different proposals, so this token will have the value of the latest supported proposal, or 0 if the proposal described here is not supported.

202603L P3795R2 Miscellaneous Reflection Cleanup

◆ LBAL_CPP26_PACK_INDEXING

#define LBAL_CPP26_PACK_INDEXING

Pack Indexing.

SD-6 equivalent: __cpp_pack_indexing >= 202311L. Note that __cpp_pack_indexing has multiple values associated with it from a number of different proposals, so this token will have the value of the latest supported proposal, or 0 if the proposal described here is not supported.

202311L P2662R3 PDF Pack Indexing

◆ LBAL_CPP26_PLACEHOLDER_VARIABLES

#define LBAL_CPP26_PLACEHOLDER_VARIABLES

Add placeholder variables (aka underscore, underbar, low line).

SD-6 equivalent: __cpp_placeholder_variables >= 202306L. This token will have a value of 0 if the proposal described here is not supported.

202306L P2169R4 PDF A Nice Placeholder With No Name

◆ LBAL_CPP26_PP_EMBED

#define LBAL_CPP26_PP_EMBED

#embed - a scannable, tooling-friendly binary resource inclusion mechanism

SD-6 equivalent: __cpp_pp_embed >= 202502L. Note that __cpp_pp_embed has multiple values associated with it from a number of different proposals, so this token will have the value of the latest supported proposal, or 0 if the proposal described here is not supported.

202502L P1967R14 #embed - a scannable, tooling-friendly binary resource inclusion mechanism

◆ LBAL_CPP26_STATIC_ASSERT_USER_MESSAGE

#define LBAL_CPP26_STATIC_ASSERT_USER_MESSAGE

Allow static assertions with user-generated messages.

SD-6 equivalent: __cpp_static_assert >= 202306L. Note that __cpp_static_assert has multiple values associated with it from a number of different proposals, so this token will have the value of the latest supported proposal, or 0 if the proposal described here is not supported.

202306L P2741R3 PDF user-generated static_assert messages

◆ LBAL_CPP26_STRUCTURED_BINDINGS_ATTRIBUTES

#define LBAL_CPP26_STRUCTURED_BINDINGS_ATTRIBUTES

Allow attributes for Structured Bindings.

SD-6 equivalent: __cpp_structured_bindings >= 202403L. Note that __cpp_structured_bindings has multiple values associated with it from a number of different proposals, so this token will have the value of the latest supported proposal, or 0 if the proposal described here is not supported.

202411L P1061R10 Structured Bindings can introduce a Pack

◆ LBAL_CPP26_STRUCTURED_BINDINGS_PACK

#define LBAL_CPP26_STRUCTURED_BINDINGS_PACK

Structured Bindings can introduce a Pack.

SD-6 equivalent: __cpp_structured_bindings >= 202403L. Note that __cpp_structured_bindings has multiple values associated with it from a number of different proposals, so this token will have the value of the latest supported proposal, or 0 if the proposal described here is not supported.

202403L P0609R3 PDF Attributes for Structured Bindings

◆ LBAL_CPP26_TEMPLATE_PARAMETERS

#define LBAL_CPP26_TEMPLATE_PARAMETERS

Allow concept and variable-template template-parameters.

SD-6 equivalent: __cpp_template_parameters >= 202502L. This token will have a value of 0 if the proposal described here is not supported.

202502L P2841R7 PDF Concept and variable- template template-parameters

◆ LBAL_CPP26_TRIVIAL_UNION

#define LBAL_CPP26_TRIVIAL_UNION

Allow trivial unions.

SD-6 equivalent: __cpp_trivial_union >= 202502L. Note that __cpp_trivial_union has multiple values associated with it from a number of different proposals, so this token will have the value of the latest supported proposal, or 0 if the proposal described here is not supported.

202502L P3074R7 trivial unions (was std::uninitialized<T>)
202603L P3074R7 trivial unions (was std::uninitialized<T>)

◆ LBAL_CPP26_TRIVIAL_UNION_LIFETIME

#define LBAL_CPP26_TRIVIAL_UNION_LIFETIME

Adjustments to union Lifetime Rules.

SD-6 equivalent: __cpp_trivial_union >= 202603L. Note that __cpp_trivial_union has multiple values associated with it from a number of different proposals, so this token will have the value of the latest supported proposal, or 0 if the proposal described here is not supported.

202603L P3726R2 Adjustments to union Lifetime Rules

◆ LBAL_CPP26_VARIADIC_FRIEND

#define LBAL_CPP26_VARIADIC_FRIEND

Support variadic friends.

SD-6 equivalent: __cpp_variadic_friend >= 202403L. This token will have a value of 0 if the proposal described here is not supported.

202403L P2893R3 Variadic Friends

◆ LBAL_CPP2D_CONCEPTS_CONDITIONAL_NOEXCEPT

#define LBAL_CPP2D_CONCEPTS_CONDITIONAL_NOEXCEPT

Conditional noexcept specifiers in compound requirements.

SD-6 equivalent: __cpp_concepts >= 202606L. Note that __cpp_concepts has multiple values associated with it from a number of different proposals, so this token will have the value of the latest supported proposal, or 0 if the proposal described here is not supported.

202606L P3822R2 Conditional noexcept specifiers in compound requirements

◆ LBAL_CPP2D_CONSTEVAL_ONLY

#define LBAL_CPP2D_CONSTEVAL_ONLY

consteval-only Values for C++26

SD-6 equivalent: __cpp_consteval >= 202606L. Note that __cpp_consteval has multiple values associated with it from a number of different proposals, so this token will have the value of the latest supported proposal, or 0 if the proposal described here is not supported.

202606L P4101R1 consteval-only Values for C++26

◆ LBAL_CPP2D_CONTRACTS_VIRTUAL

#define LBAL_CPP2D_CONTRACTS_VIRTUAL

Contracts for C++: Virtual functions.

SD-6 equivalent: __cpp_contracts >= 202606L. Note that __cpp_contracts has multiple values associated with it from a number of different proposals, so this token will have the value of the latest supported proposal, or 0 if the proposal described here is not supported.

202606L P3097R3 Contracts for C++: Virtual functions

◆ LBAL_CPP2D_DESIGNATED_INITIALIZERS_BASE_CLASSES

#define LBAL_CPP2D_DESIGNATED_INITIALIZERS_BASE_CLASSES

Designated-initializers for Base Classes.

SD-6 equivalent: __cpp_designated_initializers >= 202606L. Note that __cpp_designated_initializers has multiple values associated with it from a number of different proposals, so this token will have the value of the latest supported proposal, or 0 if the proposal described here is not supported.

202606L P2287R6 Designated-initializers for Base Classes

◆ LBAL_CPP2D_IMPL_COROUTINE_RETURN

#define LBAL_CPP2D_IMPL_COROUTINE_RETURN

return_value & return_void Are Not Mutually Exclusive

SD-6 equivalent: __cpp_impl_coroutine >= 202606L. Note that __cpp_impl_coroutine has multiple values associated with it from a number of different proposals, so this token will have the value of the latest supported proposal, or 0 if the proposal described here is not supported.

202606L P3950R1 return_value & return_void Are Not Mutually Exclusive

◆ LBAL_CPP2D_PACK_INDEXING_TEMPLATE_NAMES

#define LBAL_CPP2D_PACK_INDEXING_TEMPLATE_NAMES

Pack Indexing for Template Names.

SD-6 equivalent: __cpp_pack_indexing >= 202606L. Note that __cpp_pack_indexing has multiple values associated with it from a number of different proposals, so this token will have the value of the latest supported proposal, or 0 if the proposal described here is not supported.

202606L P3670R4 Pack Indexing for Template Names

◆ LBAL_CPP2D_PP_EMBED_OFFSET

#define LBAL_CPP2D_PP_EMBED_OFFSET

#embed offset parameter

SD-6 equivalent: __cpp_pp_embed >= 202606L. Note that __cpp_pp_embed has multiple values associated with it from a number of different proposals, so this token will have the value of the latest supported proposal, or 0 if the proposal described here is not supported.

202606L P3540R3 #embed offset parameter