功能特性测试 (C++20)

 

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功能特性测试宏(C++20)

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功能特性测试

 

标准中为 C++11 和之后引入的 C++ 语言和程序库的功能特性定义了一组预处理器宏。标准有意使之成为检测这些功能特性是否存在的一种简单且可移植的方式。

属性

__has_cpp_attribute(属性记号)

检查是否支持（宏展开后）属性记号 指名的属性。

对于每个标准属性，__has_cpp_attribute 会展开成下表中的对应值（它是该属性被添加到工作草案中时的年份和月份）还是 ​0​ 由实现定义。它只会在此标准属性能够使得实现的行为遵循推荐要求时（包括发布诊断信息和改变类布局等各类行为）展开成下表中的对应值。

厂商特定的属性会以某个非零值确定。

可以在 #if 和 #elif 的表达式中展开 __has_cpp_attribute。 #ifdef、 #ifndef、 #elifdef、 #elifndef(C++23 起) 和 defined 把它当做已定义的宏，但不能在别处使用它。

属性记号	属性	值	标准	标准文件
assume	[[assume]]	202207L	(C++23)	P1774R8
carries_dependency	[[carries_dependency]]	200809L	(C++11) (C++26 前)	N2556 N2643 P3475R2
deprecated	[[deprecated]]	201309L	(C++14)	N3760
fallthrough	[[fallthrough]]	201603L	(C++17)	P0188R1
indeterminate	[[indeterminate]]	202403L	(C++26)	P2795R5
likely	[[likely]]	201803L	(C++20)	P0479R5
maybe_unused	[[maybe_unused]]	201603L	(C++17)	P0212R1
no_unique_address	[[no_unique_address]]	201803L	(C++20)	P0840R2
nodiscard	[[nodiscard]]	201603L	(C++17)	P0189R1
	给出理由的 [[nodiscard]]	201907L	(C++20)	P1301R4
noreturn	[[noreturn]]	200809L	(C++11)	N2761
unlikely	[[unlikely]]	201803L	(C++20)	P0479R5
属性总数：11

语言功能特性

下列宏可以用来检测当前实现是否实现了某个语言功能特性。它们会在每个翻译单元预定义。

每个宏都会展开成对应于相应功能特性被包含到工作草案时的年份与月份的整数字面量。当功能特性发生了显著变更时，宏会相应地更新。

宏名	功能特性	值	标准	标准文件
__cpp_aggregate_bases	拥有基类的聚合类	201603L	(C++17)	P0017R1
__cpp_aggregate_nsdmi	拥有默认成员初始化器的聚合类	201304L	(C++14)	N3653
__cpp_aggregate_paren_init	具有直接初始化形式的聚合初始化	201902L	(C++20)	P0960R3
__cpp_alias_templates	别名模版	200704L	(C++11)	N2258
__cpp_aligned_new	过对齐数据的动态内存分配	201606L	(C++17)	P0035R4
__cpp_attributes	属性	200809L	(C++11)	N2761
__cpp_auto_cast	auto(x) 和 auto{x}	202110L	(C++23)	P0849R8
__cpp_binary_literals	二进制字面量	201304L	(C++14)	N3472
__cpp_capture_star_this	以 [=,*this] 进行 *this 的 lambda 按值捕获	201603L	(C++17)	P0018R3
__cpp_char8_t	char8_t	201811L	(C++20)	P0482R6
	char8_t 兼容性和可移植性修复（允许从 UTF-8 字符串字面量初始化（无符号）字符数组）	202207L	(C++23) (DR20)	P2513R4
__cpp_concepts	概念	201907L	(C++20)	P0734R0 P1084R2 P1452R2
	按条件平凡的特殊成员函数	202002L		P0848R3 P2493R0
__cpp_conditional_explicit	explicit(bool)	201806L	(C++20)	P0892R2
__cpp_consteval	立即函数	201811L	(C++20)	P1073R3
	使 consteval 向上传播	202211L	(C++23) (DR20)	P2564R3
__cpp_constexpr	constexpr	200704L	(C++11)	N2235
	放宽 constexpr 限制，非 const 的 constexpr 方法	201304L	(C++14)	N3652
	constexpr 的 lambda	201603L	(C++17)	P0170R1
	在常量表达式中调用虚函数；constexpr 函数中的 try 块，常量表达式中的 dynamic_cast 和多态 typeid；constexpr 函数中的平凡默认初始化和汇编声明	201907L	(C++20)	P1064R0 P1002R1 P1327R1 P1331R2 P1668R1
	在常量求值中改变联合体的活跃成员	202002L		P1330R0 P2493R0
	constexpr 函数中的非字面变量、标号和 goto 语句	202110L	(C++23)	P2242R3
	放松对 constexpr 函数和函数模板的一些限制	202207L		P2448R2
	在 constexpr 函数中允许静态 constexpr 变量	202211L		P2647R1
	从 void* 进行 constexpr 转换：走向 constexpr 类型擦除	202306L	(C++26)	P2738R1
	constexpr 布置 new	202406L		P2747R2
__cpp_constexpr_dynamic_alloc	constexpr 函数中的动态存储期操作	201907L	(C++20)	P0784R7
__cpp_constexpr_exceptions	constexpr异常	202411L	(C++26)	P3068R6
__cpp_constexpr_in_decltype	在为常量求值所需要时生成函数和变量的定义	201711L	(C++20) (DR11)	P0859R0
__cpp_constinit	constinit	201907L	(C++20)	P1143R2
__cpp_contracts	契约	202502L	(C++26)	P2900R14
__cpp_decltype	decltype	200707L	(C++11)	N2343
__cpp_decltype_auto	常规函数的返回类型推导	201304L	(C++14)	N3638
__cpp_deduction_guides	类模板的模板实参推导（CTAD）	201703L	(C++17)	P0091R3 P0512R0 P0620R0
	聚合体与别名的 CTAD	201907L	(C++20)	P1814R0 P1816R0
__cpp_delegating_constructors	委托构造函数	200604L	(C++11)	N1986
__cpp_deleted_function	带消息的弃置函数定义（= delete("应给出理由");）	202403L	(C++26)	P2573R2
__cpp_designated_initializers	指派初始化器	201707L	(C++20)	P0329R4
__cpp_enumerator_attributes	枚举项的属性	201411L	(C++17)	N4266
__cpp_explicit_this_parameter	显式对象形参	202110L	(C++23)	P0847R7
__cpp_fold_expressions	折叠表达式	201603L	(C++17)	N4295 P0036R0
	涉及折叠表达式的约束的排序	202406L	(C++26)	P2963R3
__cpp_generic_lambdas	泛型 lambda 表达式	201304L	(C++14)	N3649
	泛型 lambda 的显式模板形参列表	201707L	(C++20)	P0428R2
__cpp_guaranteed_copy_elision	通过简化的值类别保证复制消除	201606L	(C++17)	P0135R1
__cpp_hex_float	十六进制浮点字面量	201603L	(C++17)	P0245R1
__cpp_if_consteval	if consteval	202106L	(C++23)	P1938R3
__cpp_if_constexpr	if constexpr	201606L	(C++17)	P0292R2
__cpp_impl_coroutine	协程（编译器支持）	201902L	(C++20)	P0912R5 LWG3393
__cpp_impl_destroying_delete	销毁的 operator delete（编译器支持）	201806L	(C++20)	P0722R3
__cpp_impl_three_way_comparison	三路比较（编译器支持）	201907L	(C++20)	P0515R3 P0768R1 P1185R2 P1630R1
__cpp_implicit_move	简化的隐式移动	202207L	(C++23)	P2266R3
__cpp_inheriting_constructors	继承构造函数	200802L	(C++11)	N2540
	重述继承构造函数：有关继承构造函数的信规范（DR1941 等）	201511L	(C++17) (DR11)	P0136R1
__cpp_init_captures	lambda 的初始化捕获	201304L	(C++14)	N3648
	允许 lambda 初始化捕获中的包展开	201803L	(C++20)	P0780R2
__cpp_initializer_lists	列表初始化与 std::initializer_list	200806L	(C++11)	N2672
__cpp_inline_variables	内联变量	201606L	(C++17)	P0386R2
__cpp_lambdas	lambda 表达式	200907L	(C++11)	N2927
__cpp_modules	模块	201907L	(C++20)	P1103R3 P1811R0
__cpp_multidimensional_subscript	多维下标运算符	202110L	(C++23)	P2128R6
	静态的 operator[]	202211L		P2589R1
__cpp_named_character_escapes	具名的通用字符转义	202207L	(C++23)	P2071R2
__cpp_namespace_attributes	命名空间的属性	201411L	(C++17)	N4266
__cpp_noexcept_function_type	使异常说明为类型系统的一部分	201510L	(C++17)	P0012R1
__cpp_nontype_template_args	允许全部常量模板实参的常量求值	201411L	(C++17)	N4268
	常量模板形参中的类类型与浮点类型	201911L	(C++20)	P1907R1
__cpp_nontype_template_parameter_auto	以 auto 声明常量模板形参	201606L	(C++17)	P0127R2
__cpp_nsdmi	非静态数据成员初始化器	200809L	(C++11)	N2756
__cpp_pack_indexing	包索引	202311L	(C++26)	P2662R3
__cpp_placeholder_variables	好用的无名占位符	202306L	(C++26)	P2169R4
__cpp_pp_embed	#embed	202502L	(C++26)	P1967R14
__cpp_range_based_for	基于范围的 for 循环	200907L	(C++11)	N2930
	拥有不同类型的 begin/end 的基于范围的 for 循环	201603L	(C++17)	P0184R0
	基于范围的 for 循环的生存期延长	202211L	(C++23)	P2644R1 P2718R0 CWG2659
__cpp_raw_strings	原始字符串字面量	200710L	(C++11)	N2442
__cpp_ref_qualifiers	引用限定符	200710L	(C++11)	N2439
__cpp_return_type_deduction	常规函数的返回类型推导	201304L	(C++14)	N3638
__cpp_rvalue_references	右值引用	200610L	(C++11)	N2118
__cpp_size_t_suffix	std::size_t 以及它的有符号版本的字面量后缀	202011L	(C++23)	P0330R8
__cpp_sized_deallocation	具有大小的解分配函数	201309L	(C++14)	N3778
__cpp_static_assert	static_assert	200410L	(C++11)	N1720
	单参数的 static_assert	201411L	(C++17)	N3928
	用户生成的 static_assert 消息	202306L	(C++26)	P2741R3
__cpp_static_call_operator	静态的 operator()	202207L	(C++23)	P1169R4
__cpp_structured_bindings	结构化绑定	201606L	(C++17)	P0217R3
	结构化绑定的属性	202403L	(C++26)	P0609R3
	以结构化绑定声明为条件	202406L		P0963R3
	结构化绑定可以引入包	202411L		P1061R10
__cpp_template_parameters	概念和变量模板为模板形参	202502L	(C++26)	P2841R7
__cpp_template_template_args	模板模板实参的匹配	201611L	(C++17)	P0522R0
__cpp_threadsafe_static_init	并发的动态初始化和销毁	200806L	(C++11)	N2660
__cpp_trivial_relocatability	可平凡重定位性	202502L	(C++26)	P2786R13
__cpp_trivial_union	平凡联合体	202502L	(C++26)	P3074R7
__cpp_unicode_characters	新字符类型（char16_t 与 char32_t）	200704L	(C++11)	N2249
__cpp_unicode_literals	Unicode 字符串字面量	200710L	(C++11)	N2442
__cpp_user_defined_literals	用户定义字面量	200809L	(C++11)	N2765
__cpp_using_enum	using enum	201907L	(C++20)	P1099R5
__cpp_variable_templates	变量模板	201304L	(C++14)	N3651
__cpp_variadic_friend	变参友元声明	202403L	(C++26)	P2893R3
__cpp_variadic_templates	变参模板	200704L	(C++11)	N2242
__cpp_variadic_using	using 声明中的包展开	201611L	(C++17)	P0195R2
宏的总数量：76

标准库功能特性

下列宏可以用来检测当前实现是否实现了某个标准库功能特性。和语言功能特性测试宏不同，它们不会被预定义，而是由标头 <version> 提供。

对于每个标准库功能特性宏，它也会由提供了与该宏相关的标准库组件的标头提供。完整表单列表请参阅库功能特性测试宏。

每个宏都展开成它对应的功能特性被包含于工作草案时的年份与月份的相应整数字面量。当功能特性发生了显著变更时，宏会相应地更新。

宏名	功能特性	值	标准	标准文件
__cpp_lib_adaptor_iterator_pair_constructor	std::stack 与 std::queue 的迭代器对构造函数	202106L	(C++23)	P1425R4
__cpp_lib_addressof_constexpr	constexpr 的 std::addressof	201603L	(C++17)	LWG2296
__cpp_lib_algorithm_default_value_type	为各算法启用列表初始化	202403L	(C++26)	P2248R8 P3217R0
__cpp_lib_algorithm_iterator_requirements	范围迭代器作为非范围算法的输入	202207L	(C++23)	P2408R5
__cpp_lib_aligned_accessor	std::aligned_accessor：采用过量对齐指针的 std::mdspan 访问器	202411L	(C++26)	P2897R7
__cpp_lib_allocate_at_least	反馈大小的分配器接口，例如：std::allocator::allocate_at_least 和 std::allocator_traits::allocate_at_least	202302L	(C++23)	P0401R6 P2652R2 LWG3887
__cpp_lib_allocator_traits_is_always_equal	std::allocator_traits::is_always_equal，清理 noexcept	201411L	(C++17)	N4258
__cpp_lib_any	std::any	201606L	(C++17)	P0220R1 P0032R3
__cpp_lib_apply	std::apply	201603L	(C++17)	P0220R1
__cpp_lib_array_constexpr	constexpr 的 std::reverse_iterator、std::move_iterator、std::array 和 范围访问	201603L	(C++17)	P0031R0
	常量表达式迭代器(ConstexprIterator) ；std::array 的 constexpr 比较；其他的 constexpr（std::array::fill 等）	201811L	(C++20)	P0858R0 LWG3257 P1023R0 P1032R1
__cpp_lib_as_const	std::as_const	201510L	(C++17)	P0007R1
__cpp_lib_associative_heterogeneous_erasure	关联容器和无序关联容器的异质擦除	202110L	(C++23)	P2077R3
__cpp_lib_associative_heterogeneous_insertion	剩余的有序和无序关联容器中剩余成员函数的异质重载	202306L	(C++26)	P2363R5
__cpp_lib_assume_aligned	std::assume_aligned	201811L	(C++20)	P1007R3
__cpp_lib_atomic_flag_test	std::atomic_flag::test	201907L	(C++20)	P1135R6
__cpp_lib_atomic_float	原子浮点类型	201711L	(C++20)	P0020R6
__cpp_lib_atomic_is_always_lock_free	constexpr 的 std::atomic<T>::is_always_lock_free	201603L	(C++17)	P0152R1
__cpp_lib_atomic_lock_free_type_aliases	原子免锁整数类型（std::atomic_signed_lock_free 和 std::atomic_unsigned_lock_free）	201907L	(C++20)	P1135R6
__cpp_lib_atomic_min_max	原子最大值和最小值（std::atomic::fetch_min、std::atomic::fetch_max 等）	202403L	(C++26)	P0493R5
__cpp_lib_atomic_ref	std::atomic_ref	201806L	(C++20)	P0019R8
	std::atomic_ref::address()	202411L	(C++26)	P2835R7
__cpp_lib_atomic_shared_ptr	std::atomic<std::shared_ptr>	201711L	(C++20)	P0718R2
__cpp_lib_atomic_value_initialization	修复原子初始化（默认进行 std::atomic 值初始化）	201911L	(C++20)	P0883R2
__cpp_lib_atomic_wait	高效的 std::atomic 等待	201907L	(C++20)	P1135R6
__cpp_lib_barrier	std::barrier	201907L	(C++20)	P1135R6
	std::barrier 的阶段完成保障	202302L	(C++23)	P2588R3
__cpp_lib_bind_back	std::bind_back	202202L	(C++23)	P2387R3
	允许将可调用对象作为常量模板实参传递给 std::bind_back	202306L	(C++26)	P2714R1
__cpp_lib_bind_front	std::bind_front	201907L	(C++20)	P0356R5 P1651R0
	允许将可调用对象作为常量模板实参传递给 std::bind_front	202306L	(C++26)	P2714R1
__cpp_lib_bit_cast	std::bit_cast	201806L	(C++20)	P0476R2
__cpp_lib_bitops	位操纵	201907L	(C++20)	P0553R4
__cpp_lib_bitset	std::bitset 的 std::string_view 接口	202306L	(C++26)	P2697R1
__cpp_lib_bool_constant	std::bool_constant	201505L	(C++17)	N4389
__cpp_lib_bounded_array_traits	std::is_bounded_array、std::is_unbounded_array	201902L	(C++20)	P1357R1
__cpp_lib_boyer_moore_searcher	搜索器	201603L	(C++17)	P0220R1
__cpp_lib_byte	std::byte	201603L	(C++17)	P0298R3
__cpp_lib_byteswap	std::byteswap	202110L	(C++23)	P1272R4
__cpp_lib_char8_t	char8_t 的库支持	201907L	(C++20)	P0482R6 P1423R3
__cpp_lib_chrono	std::chrono::duration 和 std::chrono::time_point 的舍入函数	201510L	(C++17)	P0092R1
	使得 std::chrono::duration 和 std::chrono::time_point 的所有成员函数 constexpr	201611L		P0505R0
	日历和时区	201907L	(C++20)	P0355R7 P1466R3
	std::chrono 值类的散列支持	202306L	(C++26)	P2592R3
__cpp_lib_chrono_udls	时间类型的用户定义字面量	201304L	(C++14)	N3642
__cpp_lib_clamp	std::clamp	201603L	(C++17)	P0025R1
__cpp_lib_common_reference	使 std::reference_wrapper 的 std::common_reference_t 是引用类型	202302L	(C++23)	P2655R3
__cpp_lib_common_reference_wrapper	使 std::reference_wrapper 的 std::common_reference_t 是引用类型	202302L	(C++23)	P2655R3
__cpp_lib_complex_udls	std::complex 的用户定义字面量]]	201309L	(C++14)	N3779
__cpp_lib_concepts	标准库概念	202002L	(C++20)	P0898R3 P1754R1 P1964R2
	仅移动类型的 equality_comparable_with、totally_ordered_with 和 three_way_comparable_with	202207L	(C++23)	P2404R3
__cpp_lib_constexpr_algorithms	constexpr 的算法	201806L	(C++20)	P0202R3 P0879R0 LWG3256 LWG3792
	constexpr 的稳定排序	202306L	(C++26)	P2562R1
__cpp_lib_constexpr_atomic	constexprstd::atomic 与 std::atomic_ref	202411L	(C++26)	P3309R3
__cpp_lib_constexpr_bitset	使 std::bitset 更 constexpr	202207L	(C++23)	P2417R2
__cpp_lib_constexpr_charconv	constexpr 的 std::to_chars 和 std::from_chars 对整数类型的重载	202207L	(C++23)	P2291R3
__cpp_lib_constexpr_cmath	constexpr 的 <cmath> 和 <cstdlib> 中的数学函数	202202L	(C++23)	P0533R9
	使 <cmath> 更 constexpr	202306L	(C++26)	P1383R2
__cpp_lib_constexpr_complex	constexpr 的 std::complex	201711L	(C++20)	P0415R1
	使 <complex> 更 constexpr	202306L	(C++26)	P1383R2
__cpp_lib_constexpr_deque	constexprstd::deque	202502L	(C++26)	P3372R3
__cpp_lib_constexpr_dynamic_alloc	constexpr 的 std::allocator 和相关工具	201907L	(C++20)	P0784R7
__cpp_lib_constexpr_exceptions	异常类型的 constexpr，例如 std::bad_alloc、std::bad_cast 等	202411L	(C++26)	P3068R6
	使异常类型更 constexpr	202502L		P3378R2
__cpp_lib_constexpr_flat_map	constexpr 的 std::flat_map 与 std::flat_multimap	202502L	(C++26)	P3372R3
__cpp_lib_constexpr_flat_set	constexpr 的 std::flat_set 与 std::flat_multiset	202502L	(C++26)	P3372R3
__cpp_lib_constexpr_forward_list	constexprstd::forward_list	202502L	(C++26)	P3372R3
__cpp_lib_constexpr_functional	其他部分的 constexpr（std::default_searcher）；constexpr 的 INVOKE	201907L	(C++20)	P1032R1 P1065R2
__cpp_lib_constexpr_functional	其他部分的 constexpr（std::default_searcher）；constexpr 的 INVOKE	201907L	(C++20)	P1032R1 P1065R2
__cpp_lib_constexpr_inplace_vector	非平凡类型 std::inplace_vector 的 constexpr	202502L	(C++26)	P3074R7
__cpp_lib_constexpr_iterator	其他部分的 constexpr（std::insert_iterator 等）	201811L	(C++20)	P1032R1
__cpp_lib_constexpr_list	constexprstd::list	202502L	(C++26)	P3372R3
__cpp_lib_constexpr_map	constexpr 的 std::map 与 std::multimap	202502L	(C++26)	P3372R3
__cpp_lib_constexpr_memory	constexpr 的 std::pointer_traits	201811L	(C++20)	P1006R1
	constexpr 的 std::unique_ptr	202202L	(C++23)	P2273R3
__cpp_lib_constexpr_new	constexpr 的 布置 new	202406L	(C++26)	P2747R2
__cpp_lib_constexpr_numeric	<numeric> 中的 constexpr 的 算法	201911L	(C++20)	P1645R1
__cpp_lib_constexpr_queue	constexprstd::queue	202502L	(C++26)	P3372R3
__cpp_lib_constexpr_set	constexpr 的 std::set 与 std::multiset	202502L	(C++26)	P3372R3
__cpp_lib_constexpr_stack	constexprstd::stack	202502L	(C++26)	P3372R3
__cpp_lib_constexpr_string	constexprstd::char_traits	201611L	(C++17)	P0426R1
	constexprstd::string	201907L	(C++20)	P0980R1
__cpp_lib_constexpr_string_view	其他部分的 constexpr（std::string_view::copy）	201811L	(C++20)	P1032R1
__cpp_lib_constexpr_tuple	其他部分的 constexpr（std::tuple::operator= 等）	201811L	(C++20)	P1032R1
__cpp_lib_constexpr_typeinfo	constexpr 的 std::type_info::operator==	202106L	(C++23)	P1328R1
__cpp_lib_constexpr_unordered_map	constexpr 的 std::unordered_map 与 std::unordered_multimap	202502L	(C++26)	P3372R3
__cpp_lib_constexpr_unordered_set	constexpr 的 std::unordered_set 与 std::unordered_multiset	202502L	(C++26)	P3372R3
__cpp_lib_constexpr_utility	其他部分的 constexpr（std::pair::operator= 等）	201811L	(C++20)	P1032R1
__cpp_lib_constexpr_vector	constexpr 的 std::vector	201907L	(C++20)	P1004R2
__cpp_lib_constrained_equality	std::pair、std::tuple、std::optional 和 std::variant 的受约束关系运算符	202403L	(C++26)	P2944R3
	约束 std::expected 的相等性运算符	202411L		P3379R0
__cpp_lib_containers_ranges	字符串和容器的范围构造和插入	202202L	(C++23)	P1206R7
__cpp_lib_contracts	<contracts>：契约支持	202502L	(C++26)	P2900R14
__cpp_lib_copyable_function	std::copyable_function	202306L	(C++26)	P2548R6
__cpp_lib_coroutine	协程（库支持）	201902L	(C++20)	P0912R5 LWG3393
__cpp_lib_debugging	<debugging>：调试支持	202311L	(C++26)	P2546R5
	可替换 std::is_debugger_present	202403L		P2810R4
__cpp_lib_destroying_delete	销毁的 operator delete（库支持）	201806L	(C++20)	P0722R3
__cpp_lib_enable_shared_from_this	std::enable_shared_from_this::weak_from_this	201603L	(C++17)	P0033R1
__cpp_lib_endian	std::endian	201907L	(C++20)	P0463R1 P1612R1
__cpp_lib_erase_if	统一的容器擦除	202002L	(C++20)	P1209R0 P1115R3
__cpp_lib_exchange_function	std::exchange	201304L	(C++14)	N3668
__cpp_lib_execution	执行策略	201603L	(C++17)	P0024R2
	std::execution::unsequenced_policy	201902L	(C++20)	P1001R2
__cpp_lib_expected	类模板 std::expected	202202L	(C++23)	P0323R12
	std::expected 的单子式函数	202211L		P2505R5
__cpp_lib_filesystem	文件系统库	201703L	(C++17)	P0218R1 P0219R1 P0392R0 P0317R1
__cpp_lib_flat_map	std::flat_map 和 std::flat_multimap	202207L	(C++23)	P0429R9
__cpp_lib_flat_set	std::flat_set 和 std::flat_multiset	202207L	(C++23)	P1222R4 LWG3751
__cpp_lib_format	文本格式化	201907L	(C++20)	P0645R10 P1361R2 P1652R1
	编译时格式字符串检查；减少 std::vformat_to 的参数化	202106L	(C++23) (DR20)	P2216R3
	修复 chrono 格式化器中的本地环境处理；支持非 const 可格式化类型	202110L		P2372R3 P2418R2
	暴露 std::basic_format_string；澄清 chrono 类型的本地化的格式化的编码处理	202207L	(C++23)	P2419R2 P2508R1
	格式化指针	202304L	(C++26)	P2510R3
	格式化参数的类型检查	202305L		P2757R3
	visit 成员	202306L		P2637R3
	运行时格式字符串	202311L		P2918R2
__cpp_lib_format_path	std::filesystem::path 的格式化	202403L	(C++26)	P2845R8
__cpp_lib_format_ranges	格式化范围	202207L	(C++23)	P2286R8 P2585R1 LWG3750
__cpp_lib_format_uchar	修正代码单元作为整数的格式化	202311L	(C++26)	P2909R4
__cpp_lib_formatters	格式化 std::thread::id 和 std::stacktrace	202302L	(C++23)	P2693R1
__cpp_lib_forward_like	std::forward_like	202207L	(C++23)	P2445R1
__cpp_lib_freestanding_algorithm	<algorithm> 中的独立设施	202311L	(C++26)	P2407R5
	独立实现库：<algorithm>	202502L		P2976R1
__cpp_lib_freestanding_array	使 std::array 的部分功能独立	202311L	(C++26)	P2407R5
__cpp_lib_freestanding_char_traits	独立的 std::char_traits	202306L	(C++26)	P2338R4
__cpp_lib_freestanding_execution	独立实现库：<execution>	202502L	(C++26)	P2976R1
__cpp_lib_freestanding_charconv	<charconv> 中的独立设施	202306L	(C++26)	P2338R4
__cpp_lib_freestanding_cstdlib	<cstdlib> 中的独立设施	202306L	(C++26)	P2338R4
__cpp_lib_freestanding_cstring	<cstring> 中的独立设施	202306L	(C++26)	P2338R4
	从独立设施中移除 std::strtok	202311L		P2937R0
__cpp_lib_freestanding_cwchar	<cwchar> 中的独立设施	202306L	(C++26)	P2338R4
__cpp_lib_freestanding_errc	独立的 std::errc	202306L	(C++26)	P2338R4
__cpp_lib_freestanding_expected	使 std::expected 的部分功能独立	202311L	(C++26)	P2833R2
__cpp_lib_freestanding_feature_test_macros	支持独立的功能特性测试宏	202306L	(C++26)	P2198R7
__cpp_lib_freestanding_functional	<functional> 中的独立设施	202306L	(C++26)	P2198R7
__cpp_lib_freestanding_iterator	<iterator> 中的独立设施	202306L	(C++26)	P2198R7
__cpp_lib_freestanding_mdspan	独立的 std::mdspan	202311L	(C++26)	P2833R2
__cpp_lib_freestanding_memory	<memory> 中的独立设施	202306L	(C++26)	P2198R7
	独立实现库：<memory>	202502L		P2976R1
__cpp_lib_freestanding_numeric	<numeric> 中的独立设施（饱和算术）	202311L	(C++26)	P0543R3
	独立实现库：<numeric>	202502L		P2976R1
__cpp_lib_freestanding_operator_new	operator new 的定义（在独立实现中可选）	202306L	(C++26)	P2198R7
__cpp_lib_freestanding_optional	使 std::optional 的部分功能独立	202311L	(C++26)	P2407R5
__cpp_lib_freestanding_random	独立实现库：<random>	202502L	(C++26)	P2976R1
__cpp_lib_freestanding_ranges	<ranges> 中的独立设施	202306L	(C++26)	P2198R7
__cpp_lib_freestanding_ratio	<ratio> 中的独立设施	202306L	(C++26)	P2198R7
__cpp_lib_freestanding_string_view	使 std::string_view 的部分功能独立	202311L	(C++26)	P2407R5
__cpp_lib_freestanding_tuple	<tuple> 中的独立设施	202306L	(C++26)	P2198R7
__cpp_lib_freestanding_utility	<utility> 中的独立设施	202306L	(C++26)	P2198R7
__cpp_lib_freestanding_variant	使 std::variant 的部分功能独立	202311L	(C++26)	P2407R5
__cpp_lib_fstream_native_handle	获得文件流的原生把柄	202306L	(C++26)	P1759R6
__cpp_lib_function_ref	std::function_ref：类型擦除的可调用对象的引用	202306L	(C++26)	P0792R14
__cpp_lib_gcd_lcm	std::gcd、std::lcm	201606L	(C++17)	P0295R0
__cpp_lib_generator	std::generator：范围的同步协程生成器	202207L	(C++23)	P2502R2
__cpp_lib_generic_associative_lookup	关联容器的异质比较查找	201304L	(C++14)	N3657
__cpp_lib_generic_unordered_lookup	无序关联容器的异质比较查找	201811L	(C++20)	P0919R3
__cpp_lib_hardened_array	标准库加固（仅在加固实现中提供）	202502L	(C++26)	P3471R4
__cpp_lib_hardened_basic_string	标准库加固（仅在加固实现中提供）	202502L	(C++26)	P3471R4
__cpp_lib_hardened_basic_string_view	标准库加固（仅在加固实现中提供）	202502L	(C++26)	P3471R4
__cpp_lib_hardened_bitset	标准库加固（仅在加固实现中提供）	202502L	(C++26)	P3471R4
__cpp_lib_hardened_deque	标准库加固（仅在加固实现中提供）	202502L	(C++26)	P3471R4
__cpp_lib_hardened_expected	标准库加固（仅在加固实现中提供）	202502L	(C++26)	P3471R4
__cpp_lib_hardened_forward_list	标准库加固（仅在加固实现中提供）	202502L	(C++26)	P3471R4
__cpp_lib_hardened_inplace_vector	标准库加固（仅在加固实现中提供）	202502L	(C++26)	P3471R4
__cpp_lib_hardened_list	标准库加固（仅在加固实现中提供）	202502L	(C++26)	P3471R4
__cpp_lib_hardened_mdspan	标准库加固（仅在加固实现中提供）	202502L	(C++26)	P3471R4
__cpp_lib_hardened_optional	标准库加固（仅在加固实现中提供）	202502L	(C++26)	P3471R4
__cpp_lib_hardened_span	标准库加固（仅在加固实现中提供）	202502L	(C++26)	P3471R4
__cpp_lib_hardened_valarray	标准库加固（仅在加固实现中提供）	202502L	(C++26)	P3471R4
__cpp_lib_hardened_vector	标准库加固（仅在加固实现中提供）	202502L	(C++26)	P3471R4
__cpp_lib_hardware_interference_size	constexpr 的 std::hardware_{constructive, destructive}_interference_size	201703L	(C++17)	P0154R1
__cpp_lib_hive	<hive>：一种基于桶的容器，可重用已擦除元素的内存位置	202502L	(C++26)	P0447R28
__cpp_lib_has_unique_object_representations	std::has_unique_object_representations	201606L	(C++17)	P0258R2
__cpp_lib_hazard_pointer	<hazard_pointer>：风险指针	202306L	(C++26)	P2530R3
__cpp_lib_hypot	std::hypot 的三实参重载	201603L	(C++17)	P0030R1
__cpp_lib_incomplete_container_elements	std::forward_list、std::list 和 std::vector 的最小化不完整类型支持	201505L	(C++17)	N4510
__cpp_lib_indirect	std::indirect	202502L	(C++26)	P3019R13
__cpp_lib_inplace_vector	std::inplace_vector：可动态调整大小的固定容量向量（原位存储）	202406L	(C++26)	P0843R14
__cpp_lib_int_pow2	2 的整数次幂运算（std::has_single_bit、std::bit_ceil、std::bit_floor、std::bit_width）	202002L	(C++20)	P0556R3 P1956R1
__cpp_lib_integer_comparison_functions	整数比较函数	202002L	(C++20)	P0586R2
__cpp_lib_integer_sequence	编译期的整数序列	201304L	(C++14)	N3658
__cpp_lib_integral_constant_callable	std::integral_constant::operator()	201304L	(C++14)	N3545
__cpp_lib_interpolate	std::lerp、std::midpoint	201902L	(C++20)	P0811R3
__cpp_lib_invoke	std::invoke	201411L	(C++17)	N4169
__cpp_lib_invoke_r	std::invoke_r	202106L	(C++23)	P2136R3
__cpp_lib_ios_noreplace	为 fstream 添加排他模式	202207L	(C++23)	P2467R1
__cpp_lib_is_aggregate	std::is_aggregate	201703L	(C++17)	LWG2911
__cpp_lib_is_constant_evaluated	std::is_constant_evaluated	201811L	(C++20)	P0595R2
__cpp_lib_is_final	std::is_final	201402L	(C++14)	LWG2112
__cpp_lib_is_implicit_lifetime	std::is_implicit_lifetime	202302L	(C++23)	P2674R1
__cpp_lib_is_invocable	std::is_invocable、std::invoke_result	201703L	(C++17)	P0604R0
__cpp_lib_is_layout_compatible	std::is_layout_compatible	201907L	(C++20)	P0466R5
__cpp_lib_is_nothrow_convertible	std::is_convertible	201806L	(C++20)	P0758R1 LWG3356
__cpp_lib_is_null_pointer	std::is_null_pointer	201309L	(C++14) (DR11)	LWG2247
__cpp_lib_is_pointer_interconvertible	指针可互转换特征：std::is_pointer_interconvertible_with_class 和 std::is_pointer_interconvertible_base_of	201907L	(C++20)	P0466R5
__cpp_lib_is_scoped_enum	std::is_scoped_enum	202011L	(C++23)	P1048R1
__cpp_lib_is_sufficiently_aligned	std::is_sufficiently_aligned：检查指针对齐前条件	202411L	(C++26)	P2897R7
__cpp_lib_is_swappable	（不抛出的）可交换特征	201603L	(C++17)	P0185R1
__cpp_lib_is_virtual_base_of	std::is_virtual_base_of：用于检测虚基类的类型特征	202406L	(C++26)	P2985R0
__cpp_lib_is_within_lifetime	检查联合体可选项是否活跃（std::is_within_lifetime）	202306L	(C++26)	P2641R4
__cpp_lib_jthread	停止令牌和自动合并线程	201911L	(C++20)	P0660R10 P1869R1
__cpp_lib_latch	std::latch	201907L	(C++20)	P1135R6
__cpp_lib_launder	CWG 问题 1776：替换包含引用成员的类对象（std::launder）	201606L	(C++17)	P0137R1
__cpp_lib_linalg	一套基于 BLAS 的自由函数线性代数接口	202311L	(C++26)	P1673R13
__cpp_lib_list_remove_return_type	修改 std::forward_list 和 std::list 的 remove()、remove_if() 和 unique() 成员的返回值类型	201806L	(C++20)	P0646R1
__cpp_lib_logical_traits	类型特征的逻辑运算	201510L	(C++17)	P0013R1
__cpp_lib_make_from_tuple	std::make_from_tuple	201606L	(C++17)	P0209R2
__cpp_lib_make_reverse_iterator	std::make_reverse_iterator	201402L	(C++14)	LWG2285
__cpp_lib_make_unique	std::make_unique	201304L	(C++14)	N3656
__cpp_lib_map_try_emplace	std::map::try_emplace、std::map::insert_or_assign	201411L	(C++17)	N4279
__cpp_lib_math_constants	数学常量	201907L	(C++20)	P0631R8
__cpp_lib_math_special_functions	特殊数学函数	201603L	(C++17)	P0226R1
__cpp_lib_mdspan	std::mdspan	202207L	(C++23)	P0009R18 P2599R2 P2604R0 P2613R1
	std::mdspan 的 std::dims	202406L	(C++26)	P2389R2
__cpp_lib_memory_resource	std::pmr::memory_resource	201603L	(C++17)	P0220R1
__cpp_lib_modules	标准库模块std 和 std.compat	202207L	(C++23)	P2465R3
__cpp_lib_move_iterator_concept	使 std::move_iterator<T*> 是随机访问迭代器	202207L	(C++23)	P2520R0
__cpp_lib_move_only_function	std::move_only_function	202110L	(C++23)	P0288R9
__cpp_lib_node_extract	拼合映射和集合（std::map::extract、std::map::merge、std::map::insert(node_type) 等）	201606L	(C++17)	P0083R3
__cpp_lib_nonmember_container_access	std::size、std::data 和 std::empty	201411L	(C++17)	N4280
__cpp_lib_not_fn	std::not_fn	201603L	(C++17)	P0005R4
	允许将可调用对象作为常量模板实参传递给 std::not_fn	202306L	(C++26)	P2714R1
__cpp_lib_null_iterators	空的老式向前迭代器(LegacyForwardIterator)	201304L	(C++14)	N3644
__cpp_lib_optional	std::optional	201606L	(C++17)	P0220R1 P0032R3 P0307R2
	完全 constexpr 的 std::optional	202106L	(C++23) (DR20)	P2231R1
	std::optional 的单子式运算	202110L	(C++23)	P0798R8 LWG3621
__cpp_lib_optional_range_support	std::optional 的范围支持	202406L	(C++26)	P3168R2
__cpp_lib_out_ptr	std::out_ptr、std::inout_ptr	202106L	(C++23)	P1132R8
	独立的 std::out_ptr 和 std::inout_ptr	202311L	(C++26)	P2833R2
__cpp_lib_parallel_algorithm	并行算法	201603L	(C++17)	P0024R2
__cpp_lib_polymorphic	std::polymorphic	202502L	(C++26)	P3019R13
__cpp_lib_polymorphic_allocator	std::pmr::polymorphic_allocator<> 作为基础词汇类型	201902L	(C++20)	P0339R6 LWG3437
__cpp_lib_print	格式化的输出	202207L	(C++23)	P2093R14
	允许一种 std::print 高效实现	202403L	(C++26) (DR23)	P3107R5 P3235R3
	用 std::println 打印空行	202403L	(C++26)	P3142R0
__cpp_lib_quoted_string_io	std::quoted	201304L	(C++14)	N3654
__cpp_lib_philox_engine	std::philox_engine：基于计数器的随机数引擎	202406L	(C++26)	P2075R6
__cpp_lib_ranges	范围库和受约束算法	201911L	(C++20)	P0896R4 P1035R7 P1716R3
	不可默认初始化的视图	202106L	(C++23) (DR20)	P2325R3
	带所有权的视图	202110L		P2415R2
	std::ranges::range_adaptor_closure	202202L	(C++23)	P2387R3
	放松对范围适配器要求以允许仅移动类型	202207L		P2494R2
	移除 ranges::begin、ranges::end、ranges::rbegin、ranges::rend 和 ranges::size 的“毒药丸”重载	202211L		P2602R2
	放松对范围要求以允许某些投影	202302L		P2609R3
	移除可间接调用概念中的公共引用要求	202406L	(C++26) (DR20)	P2997R1
__cpp_lib_ranges_as_const	std::const_iterator、std::ranges::as_const_view	202207L	(C++23)	P2278R4
	使 std::basic_const_iterator 遵守其底层类型的可转换性	202311L	(C++26)	P2836R1
__cpp_lib_ranges_as_rvalue	std::ranges::as_rvalue_view	202207L	(C++23)	P2446R2
__cpp_lib_ranges_cache_latest	std::ranges::cache_latest_view	202411L	(C++26)	P3138R5
__cpp_lib_ranges_cartesian_product	std::ranges::cartesian_product_view	202207L	(C++23)	P2374R4 P2540R1
__cpp_lib_ranges_chunk	std::ranges::chunk_view	202202L	(C++23)	P2442R1
__cpp_lib_ranges_chunk_by	std::ranges::chunk_by_view	202202L	(C++23)	P2443R1
__cpp_lib_ranges_concat	std::ranges::concat_view	202403L	(C++26)	P2542R8
__cpp_lib_ranges_contains	std::ranges::contains	202207L	(C++23)	P2302R4
__cpp_lib_ranges_enumerate	std::ranges::enumerate_view	202302L	(C++23)	P2164R9
__cpp_lib_ranges_find_last	std::ranges::find_last、std::ranges::find_last_if 和 std::ranges::find_last_if_not	202207L	(C++23)	P1223R5 LWG3807
__cpp_lib_ranges_fold	std::ranges折叠算法	202207L	(C++23)	P2322R6
__cpp_lib_ranges_generate_random	随机数生成的向量 API（std::ranges::generate_random）	202403L	(C++26)	P1068R11
__cpp_lib_ranges_iota	std::ranges::iota	202202L	(C++23)	P2440R1
__cpp_lib_ranges_join_with	std::ranges::join_with_view	202202L	(C++23)	P2441R2
__cpp_lib_ranges_repeat	std::ranges::repeat_view	202207L	(C++23)	P2474R2
__cpp_lib_ranges_reserve_hint	std::ranges::approximately_sized_range 与 std::ranges::reserve_hint	202502L	(C++26)	P2846R6
__cpp_lib_ranges_slide	std::ranges::slide_view	202202L	(C++23)	P2442R1
__cpp_lib_ranges_starts_ends_with	std::ranges::starts_with、std::ranges::ends_with	202106L	(C++23)	P1659R3
__cpp_lib_ranges_stride	std::ranges::stride_view	202207L	(C++23)	P1899R3
__cpp_lib_ranges_to_container	std::ranges::to	202202L	(C++23)	P1206R7
__cpp_lib_ranges_to_input	std::ranges::to_input_view	202502L	(C++26)	P3137R3
__cpp_lib_ranges_zip	std::ranges::zip_view, std::ranges::zip_transform_view, std::ranges::adjacent_view、std::ranges::adjacent_transform_view	202110L	(C++23)	P2321R2
__cpp_lib_ratio	添加新的 2022 国际单位制（SI）前缀	202306L	(C++26)	P2734R0
__cpp_lib_raw_memory_algorithms	扩展的内存管理工具	201606L	(C++17)	P0040R3
	constexpr 的特化内存算法	202411L	(C++26)	P3508R0 P3369R0
__cpp_lib_rcu	<rcu>：读-复制更新（RCU）	202306L	(C++26)	P2545R4
__cpp_lib_reference_from_temporary	std::reference_constructs_from_temporary 和 std::reference_converts_from_temporary	202202L	(C++23)	P2255R2
__cpp_lib_reference_wrapper	std::reference_wrapper 的比较	202403L	(C++26)	P2944R3
__cpp_lib_remove_cvref	std::remove_cvref	201711L	(C++20)	P0550R2
__cpp_lib_result_of_sfinae	std::result_of 和 SFINAE	201210L	(C++14)	N3462
__cpp_lib_robust_nonmodifying_seq_ops	使非修改的序列操作更加稳健（std::mismatch、std::equal 和 std::is_permutation 的两范围重载）	201304L	(C++14)	N3671
__cpp_lib_sample	std::sample	201603L	(C++17)	P0220R1
__cpp_lib_saturation_arithmetic	饱和算术	202311L	(C++26)	P0543R3
__cpp_lib_scoped_lock	std::scoped_lock	201703L	(C++17)	P0156R2
__cpp_lib_semaphore	std::counting_semaphore、std::binary_semaphore	201907L	(C++20)	P1135R6
__cpp_lib_senders	std::execution：执行控制的发送器/接收器模型	202406L	(C++26)	P2300R10
__cpp_lib_shared_mutex	std::shared_mutex（无时限）	201505L	(C++17)	N4508
__cpp_lib_shared_ptr_arrays	std::shared_ptr<T[]>	201611L	(C++17)	P0497R0
	std::make_shared 的数组支持	201707L	(C++20)	P0674R1
__cpp_lib_shared_ptr_weak_type	shared_ptr::weak_type	201606L	(C++17)	P0163R0
__cpp_lib_shared_timed_mutex	std::shared_timed_mutex	201402L	(C++14)	N3891
__cpp_lib_shift	std::shift_left 和 std::shift_right	201806L	(C++20)	P0769R2
	std::ranges::shift_left 和 std::ranges::shift_right	202202L	(C++23)	P2440R1
__cpp_lib_simd	<simd>: 数据并行类型	202411L	(C++26)	P1928R15 P3430R3 P3441R2 P3287R3 P2933R4
__cpp_lib_simd_complex	对 std::simd 中交错复数值的支持	202502L	(C++26)	P2663R7
__cpp_lib_smart_ptr_for_overwrite	用默认初始化创建智能指针（std::allocate_shared_for_overwrite、std::make_shared_for_overwrite、std::make_unique_for_overwrite）	202002L	(C++20)	P1020R1 P1973R1
__cpp_lib_smart_ptr_owner_equality	使得 std::weak_ptr 可以作为无序关联容器的键	202306L	(C++26)	P1901R2
__cpp_lib_source_location	源代码信息捕获（std::source_location）	201907L	(C++20)	P1208R6
__cpp_lib_span	std::span	202002L	(C++20)	P0122R7 LWG3274 P1024R3 P1976R2
	使 std::span 的部分功能独立	202311L	(C++26)	P2821R5 P2833R2
__cpp_lib_span_initializer_list	从初始化器列表构造 std::span	202311L	(C++26)	P2447R6
__cpp_lib_spanstream	std::spanbuf、std::spanstream	202106L	(C++23)	P0448R4
__cpp_lib_ssize	std::ssize 和无符号 std::span::size	201902L	(C++20)	P1227R2
__cpp_lib_sstream_from_string_view	std::stringstream 的 std::string_view 接口	202306L	(C++26)	P2495R3
__cpp_lib_stacktrace	栈踪迹库	202011L	(C++23)	P0881R7
__cpp_lib_start_lifetime_as	显式生存期管理（std::start_lifetime_as）	202207L	(C++23)	P2590R2
__cpp_lib_starts_ends_with	字符串前缀和后缀检查（用于 std::string 和 std::string_view 的 starts_with() 和 ends_with()）	201711L	(C++20)	P0457R2
__cpp_lib_stdatomic_h	用于 C 原子操作的兼容头文件	202011L	(C++23)	P0943R6
__cpp_lib_string_contains	std::basic_string 和 std::basic_string_view 的 contains 函数	202011L	(C++23)	P1679R3
__cpp_lib_string_resize_and_overwrite	std::basic_string::resize_and_overwrite	202110L	(C++23)	P1072R10
__cpp_lib_string_udls	字符串类型的用户定义字面量	201304L	(C++14)	N3642
__cpp_lib_string_view	std::string_view	201606L	(C++17)	P0220R1 P0254R2
	常量表达式迭代器(ConstexprIterator)	201803L	(C++20)	P0858R0 LWG3257
	拼接std::string 和 std::string_view	202403L	(C++26)	P2591R5
__cpp_lib_submdspan	std::submdspan	202306L	(C++26)	P2630R4
	有填充 mdspan 布局	202403L		P2642R6
__cpp_lib_syncbuf	同步的带缓冲输出流（std::syncbuf、std::osyncstream）和操纵符	201803L	(C++20)	P0053R7 P0753R2
__cpp_lib_text_encoding	std::text_encoding	202306L	(C++26)	P1885R12
__cpp_lib_three_way_comparison	三路比较（库支持）：向库添加三路比较	201907L	(C++20)	P0768R1 P1614R2
__cpp_lib_to_address	将指针转换为原生指针的工具（std::to_address）	201711L	(C++20)	P0653R2
__cpp_lib_to_array	std::to_array	201907L	(C++20)	P0325R4
__cpp_lib_to_chars	初等字符串转换 （std::to_chars 和 std::from_chars）	201611L	(C++17)	P0067R5 P0682R1 LWG3137
	测试 <charconv> 函数的成功或失败	202306L	(C++26)	P2497R0
__cpp_lib_to_string	使用 std::format 重定义 std::to_string	202306L	(C++26)	P2587R3
__cpp_lib_to_underlying	std::to_underlying	202102L	(C++23)	P1682R3
__cpp_lib_transformation_trait_aliases	变换特征的别名模板	201304L	(C++14)	N3655
__cpp_lib_transparent_operators	透明的运算符函数对象（std::less<> 等）	201210L	(C++14)	N3421
	透明的 std::owner_less（std::owner_less<void>）	201510L	(C++17)	P0074R0
__cpp_lib_trivially_relocatable	可平凡重定位性的特征与操作	202502L	(C++26)	N2786R13
__cpp_lib_tuple_element_t	std::tuple_element_t	201402L	(C++14)	N3887
__cpp_lib_tuple_like	std::tuple 和元组式对象（std::pair、std::array、std::subrange）间的兼容性	202207L	(C++23)	P2165R4
	为 std::complex 添加元组协议	202311L	(C++26)	P2819R2
__cpp_lib_tuples_by_type	根据类型寻址元组	201304L	(C++14)	N3670
__cpp_lib_type_identity	std::type_identity	201806L	(C++20)	P0887R1
__cpp_lib_type_trait_variable_templates	类型特征变量模板（std::is_void_v 等）	201510L	(C++17)	P0006R0
__cpp_lib_uncaught_exceptions	std::uncaught_exceptions	201411L	(C++17)	N4259
__cpp_lib_unordered_map_try_emplace	std::unordered_map::try_emplace、std::unordered_map::insert_or_assign	201411L	(C++17)	N4279
__cpp_lib_unreachable	std::unreachable	202202L	(C++23)	P0627R6
__cpp_lib_unwrap_ref	std::unwrap_ref_decay 和 std::unwrap_reference	201811L	(C++20)	P0318R1 LWG3348
__cpp_lib_variant	std::variant：C++17 的类型安全的联合体	201606L	(C++17)	P0088R3 P0393R3 P0032R3
	用于 std::variant 派生类的 std::visit	202102L	(C++23) (DR17)	P2162R2
	完全 constexpr 的 std::variant	202106L	(C++23) (DR20)	P2231R1
	visit 成员	202306L	(C++26)	P2637R3
__cpp_lib_void_t	std::void_t	201411L	(C++17)	N3911
宏的总数量：283

示例

正常使用

运行此代码

#ifdef __has_include // 检查 __has_include 是否存在# if __has_include(<optional>) // 检查标准库# include <optional># elif __has_include(<experimental/optional>) // 检查实验版本# include <experimental/optional># elif __has_include(<boost/optional.hpp>) // 尝试外部库# include <boost/optional.hpp># else // 完全找不到# error "Missing <optional>"# endif#endif   #ifdef __has_cpp_attribute // 检查 __has_cpp_attribute 是否存在# if __has_cpp_attribute(deprecated) // 检查一个属性# define DEPRECATED(msg) [[deprecated(msg)]]# endif#endif#ifndef DEPRECATED# define DEPRECATED(msg)#endif   DEPRECATED("foo() has been deprecated")void foo();   #if __cpp_constexpr >= 201304 // 检查功能特性的指定版本# define CONSTEXPR constexpr#else# define CONSTEXPR inline#endif   CONSTEXPR int bar(unsigned i){#ifdef __cpp_binary_literals // 检查功能特性是否存在unsigned mask1 =0b11000000;unsigned mask2 =0b00000111;#elseunsigned mask1 =0xA0;unsigned mask2 =0x07;#endifif(i & mask1)return1;if(i & mask2)return2;return0;}   int main(){}

编译器功能特性输出

以下（兼容 C++11）程序将转储 C++ 编译器的功能和属性。 注意 __has_cpp_attribute() 的使用并不遵从标准而是依赖于 gcc/clang 实现。

运行此代码

staticconstexprstruct choose_what_and_how_to_print {constexprstaticint longest_macro_name {45};constexprstaticbool titles =1;constexprstaticbool counters =1;constexprstaticbool attributes =1;constexprstaticbool standard_values =1;constexprstaticbool compiler_specific =1;constexprstaticbool core_features =1;constexprstaticbool lib_features =1;constexprstaticbool supported_features =1;constexprstaticbool unsupported_features =1;constexprstaticbool sort_by_date =0;constexprstaticbool separate_year_month =1;constexprstaticbool separated_revisions =1;constexprstaticbool latest_revisions =1;constexprstaticbool cxx98 =0;constexprstaticbool cxx11 =1;constexprstaticbool cxx14 =1;constexprstaticbool cxx17 =1;constexprstaticbool cxx20 =1;constexprstaticbool cxx23 =1;constexprstaticbool cxx26 =1;constexprstaticbool cxx29 =0;} print;   #if __cplusplus < 201100# error "C++11 or better is required"#endif   #include <algorithm>#include <cstdio>#include <cstring>#include <utility>#include <vector>   #ifdef __has_include# if __has_include(<version>)# include <version># endif# if __has_include(<stdfloat>)# include <stdfloat># endif#endif   // Expect a string that starts with 6-decimal-digits or with '_' (if unsupported)#define COMPILER_VALUE_INT(n) #n [0] == '_' ? 0 : \ (#n[5] - '0') + (#n[4] - '0') * 10 + (#n[3] - '0') * 100 + \ (#n[2] - '0') * 1000 + (#n[1] - '0') * 10000 + (#n[0] - '0') * 100000#define COMPILER_FEATURE_ENTRY(expect, name) { #name, COMPILER_VALUE_INT(name), expect },   #if defined(__has_cpp_attribute) && defined(__GNUG__)# define COMPILER_ATTRIBUTE(expect, name) { #name, __has_cpp_attribute(name), expect },#else# define COMPILER_ATTRIBUTE(expect, name) { #name, COMPILER_VALUE_INT(name), expect },#endif   #define COMPILER_SPECIFIC_STRING(value) #value#define COMPILER_SPECIFIC_ENTRY(name) { #name, COMPILER_SPECIFIC_STRING(name) },   class CompilerFeature {charconst* name_;long data_;long std_;public:constexpr CompilerFeature(charconst* name, long data, long std): name_(name), data_(data), std_(std){}constexpr CompilerFeature(CompilerFeature const&)=default; CompilerFeature& operator=(CompilerFeature const&)=default;bool operator<(CompilerFeature const& rhs)const{returnstd::strcmp(name_, rhs.name_)<0;}bool operator==(CompilerFeature const& rhs)const{returnstd::strcmp(name_, rhs.name_)==0;}constexprbool supported()const{return data_ >= std_;}constexprbool maybe()const{return data_ >0;}constexprcharconst* name()const{return name_;}constexprlong std()const{return std_;}constexprlong data()const{return data_;}void data(long x){ data_ = x;}};   // Non-FTM macros, including implementation specific ones:static/*constexpr*/std::pair<constchar*, constchar*> compiler[]={ COMPILER_SPECIFIC_ENTRY(__cplusplus)//< not compiler specific, but useful :) COMPILER_SPECIFIC_ENTRY(__clang_major__) COMPILER_SPECIFIC_ENTRY(__clang_minor__) COMPILER_SPECIFIC_ENTRY(__clang_patchlevel__) COMPILER_SPECIFIC_ENTRY(__GNUG__) COMPILER_SPECIFIC_ENTRY(__GNUC_MINOR__) COMPILER_SPECIFIC_ENTRY(__GNUC_PATCHLEVEL__)// Optional <stdfloat> fixed width floating-point types (C++23) COMPILER_SPECIFIC_ENTRY(__STDCPP_FLOAT16_T__) COMPILER_SPECIFIC_ENTRY(__STDCPP_FLOAT32_T__) COMPILER_SPECIFIC_ENTRY(__STDCPP_FLOAT64_T__) COMPILER_SPECIFIC_ENTRY(__STDCPP_FLOAT128_T__) COMPILER_SPECIFIC_ENTRY(__STDCPP_BFLOAT16_T__)// C23 => C++26 COMPILER_SPECIFIC_ENTRY(__STDC_ENDIAN_BIG__) COMPILER_SPECIFIC_ENTRY(__STDC_ENDIAN_LITTLE__) COMPILER_SPECIFIC_ENTRY(__STDC_ENDIAN_NATIVE__) COMPILER_SPECIFIC_ENTRY(__STDC_VERSION_STDBIT_H__) COMPILER_SPECIFIC_ENTRY(__STDC_VERSION_STDCKDINT_H__)// Add your favorite implementation specific macros... COMPILER_SPECIFIC_ENTRY(__STDCPP_DEFAULT_NEW_ALIGNMENT__) COMPILER_SPECIFIC_ENTRY(__STDCPP_THREADS__) COMPILER_SPECIFIC_ENTRY(__STDCPP_STRICT_POINTER_SAFETY__) COMPILER_SPECIFIC_ENTRY(__STDC_EMBED_NOT_FOUND__) COMPILER_SPECIFIC_ENTRY(__STDC_EMBED_FOUND__) COMPILER_SPECIFIC_ENTRY(__STDC_EMBED_EMPTY__) COMPILER_SPECIFIC_ENTRY(__STDC__) COMPILER_SPECIFIC_ENTRY(__STDC_VERSION__) COMPILER_SPECIFIC_ENTRY(__STDC_HOSTED__) COMPILER_SPECIFIC_ENTRY(__STDC_ISO_10646__) COMPILER_SPECIFIC_ENTRY(__STDC_MB_MIGHT_NEQ_WC__) COMPILER_SPECIFIC_ENTRY(__DATE__) COMPILER_SPECIFIC_ENTRY(__TIME__)};   staticconstexpr CompilerFeature cxx98_core[]={ COMPILER_FEATURE_ENTRY(199711L, __cpp_exceptions) COMPILER_FEATURE_ENTRY(199711L, __cpp_rtti)};   staticconstexpr CompilerFeature cxx11_core[]={ COMPILER_FEATURE_ENTRY(200704L, __cpp_alias_templates) COMPILER_FEATURE_ENTRY(200809L, __cpp_attributes) COMPILER_FEATURE_ENTRY(200704L, __cpp_constexpr) COMPILER_FEATURE_ENTRY(201711L, __cpp_constexpr_in_decltype) COMPILER_FEATURE_ENTRY(200707L, __cpp_decltype) COMPILER_FEATURE_ENTRY(200604L, __cpp_delegating_constructors) COMPILER_FEATURE_ENTRY(201511L, __cpp_inheriting_constructors) COMPILER_FEATURE_ENTRY(200806L, __cpp_initializer_lists) COMPILER_FEATURE_ENTRY(200907L, __cpp_lambdas) COMPILER_FEATURE_ENTRY(200809L, __cpp_nsdmi) COMPILER_FEATURE_ENTRY(200907L, __cpp_range_based_for) COMPILER_FEATURE_ENTRY(200710L, __cpp_raw_strings) COMPILER_FEATURE_ENTRY(200710L, __cpp_ref_qualifiers) COMPILER_FEATURE_ENTRY(200610L, __cpp_rvalue_references) COMPILER_FEATURE_ENTRY(200410L, __cpp_static_assert) COMPILER_FEATURE_ENTRY(200806L, __cpp_threadsafe_static_init) COMPILER_FEATURE_ENTRY(200704L, __cpp_unicode_characters) COMPILER_FEATURE_ENTRY(200710L, __cpp_unicode_literals) COMPILER_FEATURE_ENTRY(200809L, __cpp_user_defined_literals) COMPILER_FEATURE_ENTRY(200704L, __cpp_variadic_templates)};   staticconstexpr CompilerFeature cxx14_core[]={ COMPILER_FEATURE_ENTRY(201304L, __cpp_aggregate_nsdmi) COMPILER_FEATURE_ENTRY(201304L, __cpp_binary_literals) COMPILER_FEATURE_ENTRY(201304L, __cpp_constexpr) COMPILER_FEATURE_ENTRY(201304L, __cpp_decltype_auto) COMPILER_FEATURE_ENTRY(201304L, __cpp_generic_lambdas) COMPILER_FEATURE_ENTRY(201304L, __cpp_init_captures) COMPILER_FEATURE_ENTRY(201304L, __cpp_return_type_deduction) COMPILER_FEATURE_ENTRY(201309L, __cpp_sized_deallocation) COMPILER_FEATURE_ENTRY(201304L, __cpp_variable_templates)};staticconstexpr CompilerFeature cxx14_lib[]={ COMPILER_FEATURE_ENTRY(201304L, __cpp_lib_chrono_udls) COMPILER_FEATURE_ENTRY(201309L, __cpp_lib_complex_udls) COMPILER_FEATURE_ENTRY(201304L, __cpp_lib_exchange_function) COMPILER_FEATURE_ENTRY(201304L, __cpp_lib_generic_associative_lookup) COMPILER_FEATURE_ENTRY(201304L, __cpp_lib_integer_sequence) COMPILER_FEATURE_ENTRY(201304L, __cpp_lib_integral_constant_callable) COMPILER_FEATURE_ENTRY(201402L, __cpp_lib_is_final) COMPILER_FEATURE_ENTRY(201309L, __cpp_lib_is_null_pointer) COMPILER_FEATURE_ENTRY(201402L, __cpp_lib_make_reverse_iterator) COMPILER_FEATURE_ENTRY(201304L, __cpp_lib_make_unique) COMPILER_FEATURE_ENTRY(201304L, __cpp_lib_null_iterators) COMPILER_FEATURE_ENTRY(201304L, __cpp_lib_quoted_string_io) COMPILER_FEATURE_ENTRY(201210L, __cpp_lib_result_of_sfinae) COMPILER_FEATURE_ENTRY(201304L, __cpp_lib_robust_nonmodifying_seq_ops) COMPILER_FEATURE_ENTRY(201402L, __cpp_lib_shared_timed_mutex) COMPILER_FEATURE_ENTRY(201304L, __cpp_lib_string_udls) COMPILER_FEATURE_ENTRY(201304L, __cpp_lib_transformation_trait_aliases) COMPILER_FEATURE_ENTRY(201210L, __cpp_lib_transparent_operators) COMPILER_FEATURE_ENTRY(201402L, __cpp_lib_tuple_element_t) COMPILER_FEATURE_ENTRY(201304L, __cpp_lib_tuples_by_type)};   staticconstexpr CompilerFeature cxx17_core[]={ COMPILER_FEATURE_ENTRY(201603L, __cpp_aggregate_bases) COMPILER_FEATURE_ENTRY(201606L, __cpp_aligned_new) COMPILER_FEATURE_ENTRY(201603L, __cpp_capture_star_this) COMPILER_FEATURE_ENTRY(201603L, __cpp_constexpr) COMPILER_FEATURE_ENTRY(201703L, __cpp_deduction_guides) COMPILER_FEATURE_ENTRY(201411L, __cpp_enumerator_attributes) COMPILER_FEATURE_ENTRY(201603L, __cpp_fold_expressions) COMPILER_FEATURE_ENTRY(201606L, __cpp_guaranteed_copy_elision) COMPILER_FEATURE_ENTRY(201603L, __cpp_hex_float) COMPILER_FEATURE_ENTRY(201606L, __cpp_if_constexpr) COMPILER_FEATURE_ENTRY(201606L, __cpp_inline_variables) COMPILER_FEATURE_ENTRY(201411L, __cpp_namespace_attributes) COMPILER_FEATURE_ENTRY(201510L, __cpp_noexcept_function_type) COMPILER_FEATURE_ENTRY(201411L, __cpp_nontype_template_args) COMPILER_FEATURE_ENTRY(201606L, __cpp_nontype_template_parameter_auto) COMPILER_FEATURE_ENTRY(201603L, __cpp_range_based_for) COMPILER_FEATURE_ENTRY(201411L, __cpp_static_assert) COMPILER_FEATURE_ENTRY(201606L, __cpp_structured_bindings) COMPILER_FEATURE_ENTRY(201611L, __cpp_template_template_args) COMPILER_FEATURE_ENTRY(201611L, __cpp_variadic_using)};staticconstexpr CompilerFeature cxx17_lib[]={ COMPILER_FEATURE_ENTRY(201603L, __cpp_lib_addressof_constexpr) COMPILER_FEATURE_ENTRY(201411L, __cpp_lib_allocator_traits_is_always_equal) COMPILER_FEATURE_ENTRY(201606L, __cpp_lib_any) COMPILER_FEATURE_ENTRY(201603L, __cpp_lib_apply) COMPILER_FEATURE_ENTRY(201603L, __cpp_lib_array_constexpr) COMPILER_FEATURE_ENTRY(201510L, __cpp_lib_as_const) COMPILER_FEATURE_ENTRY(201603L, __cpp_lib_atomic_is_always_lock_free) COMPILER_FEATURE_ENTRY(201505L, __cpp_lib_bool_constant) COMPILER_FEATURE_ENTRY(201603L, __cpp_lib_boyer_moore_searcher) COMPILER_FEATURE_ENTRY(201603L, __cpp_lib_byte) COMPILER_FEATURE_ENTRY(201611L, __cpp_lib_chrono) COMPILER_FEATURE_ENTRY(201603L, __cpp_lib_clamp) COMPILER_FEATURE_ENTRY(201603L, __cpp_lib_enable_shared_from_this) COMPILER_FEATURE_ENTRY(201603L, __cpp_lib_execution) COMPILER_FEATURE_ENTRY(201703L, __cpp_lib_filesystem) COMPILER_FEATURE_ENTRY(201606L, __cpp_lib_gcd_lcm) COMPILER_FEATURE_ENTRY(201703L, __cpp_lib_hardware_interference_size) COMPILER_FEATURE_ENTRY(201606L, __cpp_lib_has_unique_object_representations) COMPILER_FEATURE_ENTRY(201603L, __cpp_lib_hypot) COMPILER_FEATURE_ENTRY(201505L, __cpp_lib_incomplete_container_elements) COMPILER_FEATURE_ENTRY(201411L, __cpp_lib_invoke) COMPILER_FEATURE_ENTRY(201703L, __cpp_lib_is_aggregate) COMPILER_FEATURE_ENTRY(201703L, __cpp_lib_is_invocable) COMPILER_FEATURE_ENTRY(201603L, __cpp_lib_is_swappable) COMPILER_FEATURE_ENTRY(201606L, __cpp_lib_launder) COMPILER_FEATURE_ENTRY(201510L, __cpp_lib_logical_traits) COMPILER_FEATURE_ENTRY(201606L, __cpp_lib_make_from_tuple) COMPILER_FEATURE_ENTRY(201411L, __cpp_lib_map_try_emplace) COMPILER_FEATURE_ENTRY(201603L, __cpp_lib_math_special_functions) COMPILER_FEATURE_ENTRY(201603L, __cpp_lib_memory_resource) COMPILER_FEATURE_ENTRY(201606L, __cpp_lib_node_extract) COMPILER_FEATURE_ENTRY(201411L, __cpp_lib_nonmember_container_access) COMPILER_FEATURE_ENTRY(201603L, __cpp_lib_not_fn) COMPILER_FEATURE_ENTRY(201606L, __cpp_lib_optional) COMPILER_FEATURE_ENTRY(201603L, __cpp_lib_parallel_algorithm) COMPILER_FEATURE_ENTRY(201606L, __cpp_lib_raw_memory_algorithms) COMPILER_FEATURE_ENTRY(201603L, __cpp_lib_sample) COMPILER_FEATURE_ENTRY(201703L, __cpp_lib_scoped_lock) COMPILER_FEATURE_ENTRY(201505L, __cpp_lib_shared_mutex) COMPILER_FEATURE_ENTRY(201611L, __cpp_lib_shared_ptr_arrays) COMPILER_FEATURE_ENTRY(201606L, __cpp_lib_shared_ptr_weak_type) COMPILER_FEATURE_ENTRY(201606L, __cpp_lib_string_view) COMPILER_FEATURE_ENTRY(201611L, __cpp_lib_to_chars) COMPILER_FEATURE_ENTRY(201510L, __cpp_lib_transparent_operators) COMPILER_FEATURE_ENTRY(201510L, __cpp_lib_type_trait_variable_templates) COMPILER_FEATURE_ENTRY(201411L, __cpp_lib_uncaught_exceptions) COMPILER_FEATURE_ENTRY(201411L, __cpp_lib_unordered_map_try_emplace) COMPILER_FEATURE_ENTRY(202102L, __cpp_lib_variant) COMPILER_FEATURE_ENTRY(201411L, __cpp_lib_void_t)};   staticconstexpr CompilerFeature cxx20_core[]={ COMPILER_FEATURE_ENTRY(201902L, __cpp_aggregate_paren_init) COMPILER_FEATURE_ENTRY(202207L, __cpp_char8_t) COMPILER_FEATURE_ENTRY(202002L, __cpp_concepts) COMPILER_FEATURE_ENTRY(201806L, __cpp_conditional_explicit) COMPILER_FEATURE_ENTRY(202211L, __cpp_consteval) COMPILER_FEATURE_ENTRY(202002L, __cpp_constexpr) COMPILER_FEATURE_ENTRY(201907L, __cpp_constexpr_dynamic_alloc) COMPILER_FEATURE_ENTRY(201907L, __cpp_constinit) COMPILER_FEATURE_ENTRY(201907L, __cpp_deduction_guides) COMPILER_FEATURE_ENTRY(201707L, __cpp_designated_initializers) COMPILER_FEATURE_ENTRY(201707L, __cpp_generic_lambdas) COMPILER_FEATURE_ENTRY(201902L, __cpp_impl_coroutine) COMPILER_FEATURE_ENTRY(201806L, __cpp_impl_destroying_delete) COMPILER_FEATURE_ENTRY(201907L, __cpp_impl_three_way_comparison) COMPILER_FEATURE_ENTRY(201803L, __cpp_init_captures) COMPILER_FEATURE_ENTRY(201907L, __cpp_modules) COMPILER_FEATURE_ENTRY(201911L, __cpp_nontype_template_args) COMPILER_FEATURE_ENTRY(201907L, __cpp_using_enum)};staticconstexpr CompilerFeature cxx20_lib[]={ COMPILER_FEATURE_ENTRY(201811L, __cpp_lib_array_constexpr) COMPILER_FEATURE_ENTRY(201811L, __cpp_lib_assume_aligned) COMPILER_FEATURE_ENTRY(201907L, __cpp_lib_atomic_flag_test) COMPILER_FEATURE_ENTRY(201711L, __cpp_lib_atomic_float) COMPILER_FEATURE_ENTRY(201907L, __cpp_lib_atomic_lock_free_type_aliases) COMPILER_FEATURE_ENTRY(201806L, __cpp_lib_atomic_ref) COMPILER_FEATURE_ENTRY(201711L, __cpp_lib_atomic_shared_ptr) COMPILER_FEATURE_ENTRY(201911L, __cpp_lib_atomic_value_initialization) COMPILER_FEATURE_ENTRY(201907L, __cpp_lib_atomic_wait) COMPILER_FEATURE_ENTRY(201907L, __cpp_lib_barrier) COMPILER_FEATURE_ENTRY(201907L, __cpp_lib_bind_front) COMPILER_FEATURE_ENTRY(201806L, __cpp_lib_bit_cast) COMPILER_FEATURE_ENTRY(201907L, __cpp_lib_bitops) COMPILER_FEATURE_ENTRY(201902L, __cpp_lib_bounded_array_traits) COMPILER_FEATURE_ENTRY(201907L, __cpp_lib_char8_t) COMPILER_FEATURE_ENTRY(201907L, __cpp_lib_chrono) COMPILER_FEATURE_ENTRY(202002L, __cpp_lib_concepts) COMPILER_FEATURE_ENTRY(201806L, __cpp_lib_constexpr_algorithms) COMPILER_FEATURE_ENTRY(201711L, __cpp_lib_constexpr_complex) COMPILER_FEATURE_ENTRY(201907L, __cpp_lib_constexpr_dynamic_alloc) COMPILER_FEATURE_ENTRY(201907L, __cpp_lib_constexpr_functional) COMPILER_FEATURE_ENTRY(201811L, __cpp_lib_constexpr_iterator) COMPILER_FEATURE_ENTRY(201811L, __cpp_lib_constexpr_memory) COMPILER_FEATURE_ENTRY(201911L, __cpp_lib_constexpr_numeric) COMPILER_FEATURE_ENTRY(201907L, __cpp_lib_constexpr_string) COMPILER_FEATURE_ENTRY(201811L, __cpp_lib_constexpr_string_view) COMPILER_FEATURE_ENTRY(201811L, __cpp_lib_constexpr_tuple) COMPILER_FEATURE_ENTRY(201811L, __cpp_lib_constexpr_utility) COMPILER_FEATURE_ENTRY(201907L, __cpp_lib_constexpr_vector) COMPILER_FEATURE_ENTRY(201902L, __cpp_lib_coroutine) COMPILER_FEATURE_ENTRY(201806L, __cpp_lib_destroying_delete) COMPILER_FEATURE_ENTRY(201907L, __cpp_lib_endian) COMPILER_FEATURE_ENTRY(202002L, __cpp_lib_erase_if) COMPILER_FEATURE_ENTRY(201902L, __cpp_lib_execution) COMPILER_FEATURE_ENTRY(202110L, __cpp_lib_format) COMPILER_FEATURE_ENTRY(201811L, __cpp_lib_generic_unordered_lookup) COMPILER_FEATURE_ENTRY(202002L, __cpp_lib_int_pow2) COMPILER_FEATURE_ENTRY(202002L, __cpp_lib_integer_comparison_functions) COMPILER_FEATURE_ENTRY(201902L, __cpp_lib_interpolate) COMPILER_FEATURE_ENTRY(201811L, __cpp_lib_is_constant_evaluated) COMPILER_FEATURE_ENTRY(201907L, __cpp_lib_is_layout_compatible) COMPILER_FEATURE_ENTRY(201806L, __cpp_lib_is_nothrow_convertible) COMPILER_FEATURE_ENTRY(201907L, __cpp_lib_is_pointer_interconvertible) COMPILER_FEATURE_ENTRY(201911L, __cpp_lib_jthread) COMPILER_FEATURE_ENTRY(201907L, __cpp_lib_latch) COMPILER_FEATURE_ENTRY(201806L, __cpp_lib_list_remove_return_type) COMPILER_FEATURE_ENTRY(201907L, __cpp_lib_math_constants) COMPILER_FEATURE_ENTRY(202106L, __cpp_lib_optional) COMPILER_FEATURE_ENTRY(201902L, __cpp_lib_polymorphic_allocator) COMPILER_FEATURE_ENTRY(202110L, __cpp_lib_ranges) COMPILER_FEATURE_ENTRY(201711L, __cpp_lib_remove_cvref) COMPILER_FEATURE_ENTRY(201907L, __cpp_lib_semaphore) COMPILER_FEATURE_ENTRY(201707L, __cpp_lib_shared_ptr_arrays) COMPILER_FEATURE_ENTRY(201806L, __cpp_lib_shift) COMPILER_FEATURE_ENTRY(202002L, __cpp_lib_smart_ptr_for_overwrite) COMPILER_FEATURE_ENTRY(201907L, __cpp_lib_source_location) COMPILER_FEATURE_ENTRY(202002L, __cpp_lib_span) COMPILER_FEATURE_ENTRY(201902L, __cpp_lib_ssize) COMPILER_FEATURE_ENTRY(201711L, __cpp_lib_starts_ends_with) COMPILER_FEATURE_ENTRY(201803L, __cpp_lib_string_view) COMPILER_FEATURE_ENTRY(201803L, __cpp_lib_syncbuf) COMPILER_FEATURE_ENTRY(201907L, __cpp_lib_three_way_comparison) COMPILER_FEATURE_ENTRY(201711L, __cpp_lib_to_address) COMPILER_FEATURE_ENTRY(201907L, __cpp_lib_to_array) COMPILER_FEATURE_ENTRY(201806L, __cpp_lib_type_identity) COMPILER_FEATURE_ENTRY(201811L, __cpp_lib_unwrap_ref) COMPILER_FEATURE_ENTRY(202106L, __cpp_lib_variant)};   staticconstexpr CompilerFeature cxx23_core[]={ COMPILER_FEATURE_ENTRY(202110L, __cpp_auto_cast) COMPILER_FEATURE_ENTRY(202211L, __cpp_constexpr) COMPILER_FEATURE_ENTRY(202110L, __cpp_explicit_this_parameter) COMPILER_FEATURE_ENTRY(202106L, __cpp_if_consteval) COMPILER_FEATURE_ENTRY(202207L, __cpp_implicit_move) COMPILER_FEATURE_ENTRY(202211L, __cpp_multidimensional_subscript) COMPILER_FEATURE_ENTRY(202207L, __cpp_named_character_escapes) COMPILER_FEATURE_ENTRY(202211L, __cpp_range_based_for) COMPILER_FEATURE_ENTRY(202011L, __cpp_size_t_suffix) COMPILER_FEATURE_ENTRY(202207L, __cpp_static_call_operator)};staticconstexpr CompilerFeature cxx23_lib[]={ COMPILER_FEATURE_ENTRY(202106L, __cpp_lib_adaptor_iterator_pair_constructor) COMPILER_FEATURE_ENTRY(202207L, __cpp_lib_algorithm_iterator_requirements) COMPILER_FEATURE_ENTRY(202302L, __cpp_lib_allocate_at_least) COMPILER_FEATURE_ENTRY(202110L, __cpp_lib_associative_heterogeneous_erasure) COMPILER_FEATURE_ENTRY(202302L, __cpp_lib_barrier) COMPILER_FEATURE_ENTRY(202202L, __cpp_lib_bind_back) COMPILER_FEATURE_ENTRY(202110L, __cpp_lib_byteswap) COMPILER_FEATURE_ENTRY(202302L, __cpp_lib_common_reference) COMPILER_FEATURE_ENTRY(202302L, __cpp_lib_common_reference_wrapper) COMPILER_FEATURE_ENTRY(202207L, __cpp_lib_concepts) COMPILER_FEATURE_ENTRY(202207L, __cpp_lib_constexpr_bitset) COMPILER_FEATURE_ENTRY(202207L, __cpp_lib_constexpr_charconv) COMPILER_FEATURE_ENTRY(202202L, __cpp_lib_constexpr_cmath) COMPILER_FEATURE_ENTRY(202202L, __cpp_lib_constexpr_memory) COMPILER_FEATURE_ENTRY(202106L, __cpp_lib_constexpr_typeinfo) COMPILER_FEATURE_ENTRY(202202L, __cpp_lib_containers_ranges) COMPILER_FEATURE_ENTRY(202211L, __cpp_lib_expected) COMPILER_FEATURE_ENTRY(202207L, __cpp_lib_flat_map) COMPILER_FEATURE_ENTRY(202207L, __cpp_lib_flat_set) COMPILER_FEATURE_ENTRY(202207L, __cpp_lib_format) COMPILER_FEATURE_ENTRY(202207L, __cpp_lib_format_ranges) COMPILER_FEATURE_ENTRY(202302L, __cpp_lib_formatters) COMPILER_FEATURE_ENTRY(202207L, __cpp_lib_forward_like) COMPILER_FEATURE_ENTRY(202207L, __cpp_lib_generator) COMPILER_FEATURE_ENTRY(202106L, __cpp_lib_invoke_r) COMPILER_FEATURE_ENTRY(202207L, __cpp_lib_ios_noreplace) COMPILER_FEATURE_ENTRY(202302L, __cpp_lib_is_implicit_lifetime) COMPILER_FEATURE_ENTRY(202011L, __cpp_lib_is_scoped_enum) COMPILER_FEATURE_ENTRY(202207L, __cpp_lib_mdspan) COMPILER_FEATURE_ENTRY(202207L, __cpp_lib_modules) COMPILER_FEATURE_ENTRY(202207L, __cpp_lib_move_iterator_concept) COMPILER_FEATURE_ENTRY(202110L, __cpp_lib_move_only_function) COMPILER_FEATURE_ENTRY(202110L, __cpp_lib_optional) COMPILER_FEATURE_ENTRY(202106L, __cpp_lib_out_ptr) COMPILER_FEATURE_ENTRY(202207L, __cpp_lib_print) COMPILER_FEATURE_ENTRY(202302L, __cpp_lib_ranges) COMPILER_FEATURE_ENTRY(202207L, __cpp_lib_ranges_as_const) COMPILER_FEATURE_ENTRY(202207L, __cpp_lib_ranges_as_rvalue) COMPILER_FEATURE_ENTRY(202207L, __cpp_lib_ranges_cartesian_product) COMPILER_FEATURE_ENTRY(202202L, __cpp_lib_ranges_chunk) COMPILER_FEATURE_ENTRY(202202L, __cpp_lib_ranges_chunk_by) COMPILER_FEATURE_ENTRY(202207L, __cpp_lib_ranges_contains) COMPILER_FEATURE_ENTRY(202302L, __cpp_lib_ranges_enumerate) COMPILER_FEATURE_ENTRY(202207L, __cpp_lib_ranges_find_last) COMPILER_FEATURE_ENTRY(202207L, __cpp_lib_ranges_fold) COMPILER_FEATURE_ENTRY(202202L, __cpp_lib_ranges_iota) COMPILER_FEATURE_ENTRY(202202L, __cpp_lib_ranges_join_with) COMPILER_FEATURE_ENTRY(202207L, __cpp_lib_ranges_repeat) COMPILER_FEATURE_ENTRY(202202L, __cpp_lib_ranges_slide) COMPILER_FEATURE_ENTRY(202106L, __cpp_lib_ranges_starts_ends_with) COMPILER_FEATURE_ENTRY(202207L, __cpp_lib_ranges_stride) COMPILER_FEATURE_ENTRY(202202L, __cpp_lib_ranges_to_container) COMPILER_FEATURE_ENTRY(202110L, __cpp_lib_ranges_zip) COMPILER_FEATURE_ENTRY(202202L, __cpp_lib_reference_from_temporary) COMPILER_FEATURE_ENTRY(202202L, __cpp_lib_shift) COMPILER_FEATURE_ENTRY(202106L, __cpp_lib_spanstream) COMPILER_FEATURE_ENTRY(202011L, __cpp_lib_stacktrace) COMPILER_FEATURE_ENTRY(202207L, __cpp_lib_start_lifetime_as) COMPILER_FEATURE_ENTRY(202011L, __cpp_lib_stdatomic_h) COMPILER_FEATURE_ENTRY(202011L, __cpp_lib_string_contains) COMPILER_FEATURE_ENTRY(202110L, __cpp_lib_string_resize_and_overwrite) COMPILER_FEATURE_ENTRY(202102L, __cpp_lib_to_underlying) COMPILER_FEATURE_ENTRY(202207L, __cpp_lib_tuple_like) COMPILER_FEATURE_ENTRY(202202L, __cpp_lib_unreachable)};   staticconstexpr CompilerFeature cxx26_core[]={//< Continue to Populate COMPILER_FEATURE_ENTRY(202406L, __cpp_constexpr) COMPILER_FEATURE_ENTRY(202411L, __cpp_constexpr_exceptions) COMPILER_FEATURE_ENTRY(202502L, __cpp_contracts) COMPILER_FEATURE_ENTRY(202403L, __cpp_deleted_function) COMPILER_FEATURE_ENTRY(202406L, __cpp_fold_expressions) COMPILER_FEATURE_ENTRY(202311L, __cpp_pack_indexing) COMPILER_FEATURE_ENTRY(202306L, __cpp_placeholder_variables) COMPILER_FEATURE_ENTRY(202502L, __cpp_pp_embed) COMPILER_FEATURE_ENTRY(202306L, __cpp_static_assert) COMPILER_FEATURE_ENTRY(202411L, __cpp_structured_bindings) COMPILER_FEATURE_ENTRY(202502L, __cpp_template_parameters) COMPILER_FEATURE_ENTRY(202502L, __cpp_trivial_relocatability) COMPILER_FEATURE_ENTRY(202502L, __cpp_trivial_union) COMPILER_FEATURE_ENTRY(202403L, __cpp_variadic_friend)};staticconstexpr CompilerFeature cxx26_lib[]={//< Continue to Populate COMPILER_FEATURE_ENTRY(202403L, __cpp_lib_algorithm_default_value_type) COMPILER_FEATURE_ENTRY(202411L, __cpp_lib_aligned_accessor) COMPILER_FEATURE_ENTRY(202311L, __cpp_lib_associative_heterogeneous_insertion) COMPILER_FEATURE_ENTRY(202403L, __cpp_lib_atomic_min_max) COMPILER_FEATURE_ENTRY(202411L, __cpp_lib_atomic_ref) COMPILER_FEATURE_ENTRY(202306L, __cpp_lib_bind_back) COMPILER_FEATURE_ENTRY(202306L, __cpp_lib_bind_front) COMPILER_FEATURE_ENTRY(202306L, __cpp_lib_bitset) COMPILER_FEATURE_ENTRY(202306L, __cpp_lib_chrono) COMPILER_FEATURE_ENTRY(202306L, __cpp_lib_constexpr_algorithms) COMPILER_FEATURE_ENTRY(202411L, __cpp_lib_constexpr_atomic) COMPILER_FEATURE_ENTRY(202306L, __cpp_lib_constexpr_cmath) COMPILER_FEATURE_ENTRY(202306L, __cpp_lib_constexpr_complex) COMPILER_FEATURE_ENTRY(202502L, __cpp_lib_constexpr_deque) COMPILER_FEATURE_ENTRY(202502L, __cpp_lib_constexpr_exceptions) COMPILER_FEATURE_ENTRY(202502L, __cpp_lib_constexpr_flat_map) COMPILER_FEATURE_ENTRY(202502L, __cpp_lib_constexpr_flat_set) COMPILER_FEATURE_ENTRY(202502L, __cpp_lib_constexpr_forward_list) COMPILER_FEATURE_ENTRY(202502L, __cpp_lib_constexpr_inplace_vector) COMPILER_FEATURE_ENTRY(202502L, __cpp_lib_constexpr_list) COMPILER_FEATURE_ENTRY(202502L, __cpp_lib_constexpr_map) COMPILER_FEATURE_ENTRY(202406L, __cpp_lib_constexpr_new) COMPILER_FEATURE_ENTRY(202502L, __cpp_lib_constexpr_queue) COMPILER_FEATURE_ENTRY(202502L, __cpp_lib_constexpr_set) COMPILER_FEATURE_ENTRY(202502L, __cpp_lib_constexpr_stack) COMPILER_FEATURE_ENTRY(202502L, __cpp_lib_constexpr_unordered_map) COMPILER_FEATURE_ENTRY(202502L, __cpp_lib_constexpr_unordered_set) COMPILER_FEATURE_ENTRY(202411L, __cpp_lib_constrained_equality) COMPILER_FEATURE_ENTRY(202502L, __cpp_lib_contracts) COMPILER_FEATURE_ENTRY(202306L, __cpp_lib_copyable_function) COMPILER_FEATURE_ENTRY(202403L, __cpp_lib_debugging) COMPILER_FEATURE_ENTRY(202311L, __cpp_lib_format) COMPILER_FEATURE_ENTRY(202403L, __cpp_lib_format_path) COMPILER_FEATURE_ENTRY(202311L, __cpp_lib_format_uchar) COMPILER_FEATURE_ENTRY(202502L, __cpp_lib_freestanding_algorithm) COMPILER_FEATURE_ENTRY(202311L, __cpp_lib_freestanding_array) COMPILER_FEATURE_ENTRY(202306L, __cpp_lib_freestanding_char_traits) COMPILER_FEATURE_ENTRY(202306L, __cpp_lib_freestanding_charconv) COMPILER_FEATURE_ENTRY(202306L, __cpp_lib_freestanding_cstdlib) COMPILER_FEATURE_ENTRY(202311L, __cpp_lib_freestanding_cstring) COMPILER_FEATURE_ENTRY(202306L, __cpp_lib_freestanding_cwchar) COMPILER_FEATURE_ENTRY(202306L, __cpp_lib_freestanding_errc) COMPILER_FEATURE_ENTRY(202502L, __cpp_lib_freestanding_execution) COMPILER_FEATURE_ENTRY(202311L, __cpp_lib_freestanding_expected) COMPILER_FEATURE_ENTRY(202306L, __cpp_lib_freestanding_feature_test_macros) COMPILER_FEATURE_ENTRY(202306L, __cpp_lib_freestanding_functional) COMPILER_FEATURE_ENTRY(202306L, __cpp_lib_freestanding_iterator) COMPILER_FEATURE_ENTRY(202311L, __cpp_lib_freestanding_mdspan) COMPILER_FEATURE_ENTRY(202502L, __cpp_lib_freestanding_memory) COMPILER_FEATURE_ENTRY(202502L, __cpp_lib_freestanding_numeric) COMPILER_FEATURE_ENTRY(202306L, __cpp_lib_freestanding_operator_new) COMPILER_FEATURE_ENTRY(202311L, __cpp_lib_freestanding_optional) COMPILER_FEATURE_ENTRY(202502L, __cpp_lib_freestanding_random) COMPILER_FEATURE_ENTRY(202306L, __cpp_lib_freestanding_ranges) COMPILER_FEATURE_ENTRY(202306L, __cpp_lib_freestanding_ratio) COMPILER_FEATURE_ENTRY(202311L, __cpp_lib_freestanding_string_view) COMPILER_FEATURE_ENTRY(202306L, __cpp_lib_freestanding_tuple) COMPILER_FEATURE_ENTRY(202306L, __cpp_lib_freestanding_utility) COMPILER_FEATURE_ENTRY(202311L, __cpp_lib_freestanding_variant) COMPILER_FEATURE_ENTRY(202306L, __cpp_lib_fstream_native_handle) COMPILER_FEATURE_ENTRY(202306L, __cpp_lib_function_ref) COMPILER_FEATURE_ENTRY(202502L, __cpp_lib_hardened_array) COMPILER_FEATURE_ENTRY(202502L, __cpp_lib_hardened_basic_string) COMPILER_FEATURE_ENTRY(202502L, __cpp_lib_hardened_basic_string_view) COMPILER_FEATURE_ENTRY(202502L, __cpp_lib_hardened_bitset) COMPILER_FEATURE_ENTRY(202502L, __cpp_lib_hardened_deque) COMPILER_FEATURE_ENTRY(202502L, __cpp_lib_hardened_expected) COMPILER_FEATURE_ENTRY(202502L, __cpp_lib_hardened_forward_list) COMPILER_FEATURE_ENTRY(202502L, __cpp_lib_hardened_inplace_vector) COMPILER_FEATURE_ENTRY(202502L, __cpp_lib_hardened_list) COMPILER_FEATURE_ENTRY(202502L, __cpp_lib_hardened_mdspan) COMPILER_FEATURE_ENTRY(202502L, __cpp_lib_hardened_optional) COMPILER_FEATURE_ENTRY(202502L, __cpp_lib_hardened_span) COMPILER_FEATURE_ENTRY(202502L, __cpp_lib_hardened_valarray) COMPILER_FEATURE_ENTRY(202502L, __cpp_lib_hardened_vector) COMPILER_FEATURE_ENTRY(202306L, __cpp_lib_hazard_pointer) COMPILER_FEATURE_ENTRY(202502L, __cpp_lib_hive) COMPILER_FEATURE_ENTRY(202502L, __cpp_lib_indirect) COMPILER_FEATURE_ENTRY(202406L, __cpp_lib_inplace_vector) COMPILER_FEATURE_ENTRY(202411L, __cpp_lib_is_sufficiently_aligned) COMPILER_FEATURE_ENTRY(202406L, __cpp_lib_is_virtual_base_of) COMPILER_FEATURE_ENTRY(202306L, __cpp_lib_is_within_lifetime) COMPILER_FEATURE_ENTRY(202311L, __cpp_lib_linalg) COMPILER_FEATURE_ENTRY(202406L, __cpp_lib_mdspan) COMPILER_FEATURE_ENTRY(202306L, __cpp_lib_not_fn) COMPILER_FEATURE_ENTRY(202406L, __cpp_lib_optional_range_support) COMPILER_FEATURE_ENTRY(202311L, __cpp_lib_out_ptr) COMPILER_FEATURE_ENTRY(202406L, __cpp_lib_philox_engine) COMPILER_FEATURE_ENTRY(202502L, __cpp_lib_polymorphic) COMPILER_FEATURE_ENTRY(202403L, __cpp_lib_print) COMPILER_FEATURE_ENTRY(202406L, __cpp_lib_ranges) COMPILER_FEATURE_ENTRY(202311L, __cpp_lib_ranges_as_const) COMPILER_FEATURE_ENTRY(202411L, __cpp_lib_ranges_cache_latest) COMPILER_FEATURE_ENTRY(202403L, __cpp_lib_ranges_concat) COMPILER_FEATURE_ENTRY(202403L, __cpp_lib_ranges_generate_random) COMPILER_FEATURE_ENTRY(202502L, __cpp_lib_ranges_reserve_hint) COMPILER_FEATURE_ENTRY(202502L, __cpp_lib_ranges_to_input) COMPILER_FEATURE_ENTRY(202306L, __cpp_lib_ratio) COMPILER_FEATURE_ENTRY(202411L, __cpp_lib_raw_memory_algorithms) COMPILER_FEATURE_ENTRY(202306L, __cpp_lib_rcu) COMPILER_FEATURE_ENTRY(202403L, __cpp_lib_reference_wrapper) COMPILER_FEATURE_ENTRY(202311L, __cpp_lib_saturation_arithmetic) COMPILER_FEATURE_ENTRY(202406L, __cpp_lib_senders) COMPILER_FEATURE_ENTRY(202411L, __cpp_lib_simd) COMPILER_FEATURE_ENTRY(202502L, __cpp_lib_simd_complex) COMPILER_FEATURE_ENTRY(202306L, __cpp_lib_smart_ptr_owner_equality) COMPILER_FEATURE_ENTRY(202311L, __cpp_lib_span) COMPILER_FEATURE_ENTRY(202311L, __cpp_lib_span_initializer_list) COMPILER_FEATURE_ENTRY(202306L, __cpp_lib_sstream_from_string_view) COMPILER_FEATURE_ENTRY(202403L, __cpp_lib_string_view) COMPILER_FEATURE_ENTRY(202403L, __cpp_lib_submdspan) COMPILER_FEATURE_ENTRY(202306L, __cpp_lib_text_encoding) COMPILER_FEATURE_ENTRY(202306L, __cpp_lib_to_chars) COMPILER_FEATURE_ENTRY(202306L, __cpp_lib_to_string) COMPILER_FEATURE_ENTRY(202502L, __cpp_lib_trivially_relocatable) COMPILER_FEATURE_ENTRY(202311L, __cpp_lib_tuple_like) COMPILER_FEATURE_ENTRY(202306L, __cpp_lib_variant)};   staticconstexpr CompilerFeature cxx29_core[]={//< Continue to Populate COMPILER_FEATURE_ENTRY(202604L, __cpp_core_TODO)};staticconstexpr CompilerFeature cxx29_lib[]={//< Continue to Populate COMPILER_FEATURE_ENTRY(202604L, __cpp_lib_TODO)};   staticconstexpr CompilerFeature attributes[]={ COMPILER_ATTRIBUTE(202207L, assume) COMPILER_ATTRIBUTE(200809L, carries_dependency) COMPILER_ATTRIBUTE(201309L, deprecated) COMPILER_ATTRIBUTE(201603L, fallthrough) COMPILER_ATTRIBUTE(202403L, indeterminate) COMPILER_ATTRIBUTE(201803L, likely) COMPILER_ATTRIBUTE(201603L, maybe_unused) COMPILER_ATTRIBUTE(201803L, no_unique_address) COMPILER_ATTRIBUTE(201907L, nodiscard) COMPILER_ATTRIBUTE(200809L, noreturn) COMPILER_ATTRIBUTE(201803L, unlikely)};   inlinevoid show_compiler_specific_info(){std::printf("OTHER MACROS:\n");for(auto co : compiler)if(std::strcmp(co.first, co.second))std::printf("%*s %s\n", -print.longest_macro_name, co.first, co.second);}   inlinevoid print_compiler_feature(const CompilerFeature& x){if(not ((print.supported_features and x.maybe()) or (print.unsupported_features and not x.maybe())))return;auto print_year_month =[](long n){returnstd::printf("%ld%s%02ld", n /100, print.separate_year_month?"-":"", n %100);};std::printf("%*s ", -print.longest_macro_name, x.name()); x.maybe()? print_year_month(x.data()):std::printf("------%s", print.separate_year_month?"-":"");if(print.standard_values)std::printf("  %c ", (x.supported()?(x.data()> x.std()?'>':'='):'<')), print_year_month(x.std());std::puts("");}   template<class Container>inlinevoid show(charconst*const title, Container const& co){if(print.titles){std::printf("%-s (", title);if(print.counters){std::printf("%zd/", std::count_if(std::begin(co), std::end(co), [](CompilerFeature x){return x.supported();}));}std::printf("%td)\n", std::distance(std::begin(co), std::end(co)));}if(print.sort_by_date){std::vector<CompilerFeature> v(std::begin(co), std::end(co));std::stable_sort(v.begin(), v.end(), [](CompilerFeature const& lhs, CompilerFeature const& rhs){return lhs.data()< rhs.data();});std::for_each(v.cbegin(), v.cend(), print_compiler_feature);}elsestd::for_each(std::begin(co), std::end(co), print_compiler_feature);std::puts("");}   inlinevoid show_latest(){auto latest_rev =[]()->int{return print.cxx29?29: print.cxx26?26: print.cxx23?23: print.cxx20?20: print.cxx17?17: print.cxx14?14: print.cxx11?11:98;};std::vector<CompilerFeature> latest;auto add =[&latest](CompilerFeature x){auto i =std::lower_bound(latest.begin(), latest.end(), x);if(i == latest.end() or not (*i == x)) latest.insert(i, x);elseif(i->data()< x.data()) i->data(x.data());};char text[64]; latest.reserve(512);// max macrosif(print.core_features){// preserve reverse revision insertion order!if(print.cxx29)std::for_each(std::begin(cxx29_core), std::end(cxx29_core), add);if(print.cxx26)std::for_each(std::begin(cxx26_core), std::end(cxx26_core), add);if(print.cxx23)std::for_each(std::begin(cxx23_core), std::end(cxx23_core), add);if(print.cxx20)std::for_each(std::begin(cxx20_core), std::end(cxx20_core), add);if(print.cxx17)std::for_each(std::begin(cxx17_core), std::end(cxx17_core), add);if(print.cxx14)std::for_each(std::begin(cxx14_core), std::end(cxx14_core), add);if(print.cxx11)std::for_each(std::begin(cxx11_core), std::end(cxx11_core), add);if(print.cxx98)std::for_each(std::begin(cxx98_core), std::end(cxx98_core), add);std::snprintf(text, sizeof text, "ALL CORE MACROS UP TO C++%02i", latest_rev()); show(text, latest);} latest.clear();if(print.lib_features){// preserve reverse revision insertion order!if(print.cxx29)std::for_each(std::begin(cxx29_lib), std::end(cxx29_lib), add);if(print.cxx26)std::for_each(std::begin(cxx26_lib), std::end(cxx26_lib), add);if(print.cxx23)std::for_each(std::begin(cxx23_lib), std::end(cxx23_lib), add);if(print.cxx20)std::for_each(std::begin(cxx20_lib), std::end(cxx20_lib), add);if(print.cxx17)std::for_each(std::begin(cxx17_lib), std::end(cxx17_lib), add);if(print.cxx14)std::for_each(std::begin(cxx14_lib), std::end(cxx14_lib), add);std::snprintf(text, sizeof text, "ALL LIB MACROS UP TO C++%02i", latest_rev()); show(text, latest);}}   int main(){if(print.separated_revisions){if(print.cxx98 and print.core_features) show("C++98 CORE", cxx98_core);if(print.cxx11 and print.core_features) show("C++11 CORE", cxx11_core);if(print.cxx14 and print.core_features) show("C++14 CORE", cxx14_core);if(print.cxx14 and print.lib_features) show("C++14 LIB" , cxx14_lib);if(print.cxx17 and print.core_features) show("C++17 CORE", cxx17_core);if(print.cxx17 and print.lib_features) show("C++17 LIB" , cxx17_lib);if(print.cxx20 and print.core_features) show("C++20 CORE", cxx20_core);if(print.cxx20 and print.lib_features) show("C++20 LIB" , cxx20_lib);if(print.cxx23 and print.core_features) show("C++23 CORE", cxx23_core);if(print.cxx23 and print.lib_features) show("C++23 LIB" , cxx23_lib);if(print.cxx26 and print.core_features) show("C++26 CORE", cxx26_core);if(print.cxx26 and print.lib_features) show("C++26 LIB" , cxx26_lib);if(print.cxx29 and print.core_features) show("C++29 CORE", cxx29_core);if(print.cxx29 and print.lib_features) show("C++29 LIB" , cxx29_lib);}if(print.latest_revisions) show_latest();if(print.attributes) show("ATTRIBUTES", attributes);if(print.compiler_specific) show_compiler_specific_info();}

可能的输出：

C++11 CORE (20/20) __cpp_alias_templates 2007-04 = 2007-04 __cpp_attributes 2008-09 = 2008-09 __cpp_constexpr 2022-11 > 2007-04 __cpp_constexpr_in_decltype 2017-11 = 2017-11 ... truncated ...   C++14 CORE (9/9) __cpp_aggregate_nsdmi 2013-04 = 2013-04 __cpp_binary_literals 2013-04 = 2013-04 __cpp_constexpr 2022-11 > 2013-04 ... truncated ...   C++14 LIB (20/20) __cpp_lib_chrono_udls 2013-04 = 2013-04 __cpp_lib_complex_udls 2013-09 = 2013-09 __cpp_lib_exchange_function 2013-04 = 2013-04 ... truncated ...   ... truncated ...   C++23 LIB (43/64) __cpp_lib_adaptor_iterator_pair_constructor 2021-06 = 2021-06 __cpp_lib_algorithm_iterator_requirements ------- < 2022-07 __cpp_lib_allocate_at_least ------- < 2023-02 __cpp_lib_associative_heterogeneous_erasure ------- < 2021-10 __cpp_lib_barrier 2019-07 < 2023-02 ... truncated ...   ALL CORE MACROS UP TO C++26 (60/76) __cpp_aggregate_bases 2016-03 = 2016-03 __cpp_aggregate_nsdmi 2013-04 = 2013-04 __cpp_aggregate_paren_init 2019-02 = 2019-02 __cpp_alias_templates 2007-04 = 2007-04 ... truncated ...   ALL LIB MACROS UP TO C++26 (158/282) __cpp_lib_adaptor_iterator_pair_constructor 2021-06 = 2021-06 __cpp_lib_addressof_constexpr 2016-03 = 2016-03 __cpp_lib_algorithm_iterator_requirements ------- < 2022-07 __cpp_lib_allocate_at_least ------- < 2023-02 __cpp_lib_allocator_traits_is_always_equal 2014-11 = 2014-11 ... truncated ...   ATTRIBUTES (9/11) assume 2022-07 = 2022-07 carries_dependency ------- < 2008-09 deprecated 2013-09 = 2013-09 fallthrough 2016-03 = 2016-03 ... truncated ...   OTHER MACROS: __cplusplus 202302L __GNUG__ 14 __GNUC_MINOR__ 2 __GNUC_PATCHLEVEL__ 0 __STDCPP_FLOAT16_T__ 1 __STDCPP_FLOAT32_T__ 1 ... truncated ...

缺陷报告

下列更改行为的缺陷报告追溯地应用于以前出版的 C++ 标准。

缺陷报告	应用于	出版时的行为	正确行为
P2552R3	C++20	__has_cpp_attribute 对于标准属性必须展开成非零值	可以展开成 ​0​

参阅

库功能特性测试宏(C++20)	在标头 <version> 定义
预定义宏符号
宏符号索引

外部链接

1.	特性测试推荐的官方文档
2.	试出编译器特性的源码