The standard defines a set of preprocessor macros corresponding to C++ language and library features introduced in C++11 or later. They are intended as a simple and portable way to detect the presence of said features.
__has_cpp_attribute( attribute-token ) |
Checks for the support of an attribute named by attribute-token (after macro expansion).
For each standard attribute, it is implementation-defined whether __has_cpp_attribute expands to the year and month in which the attribute was added to the working draft (see table below) or 0. It is recommended that non-zero value is given if and only if the standard attribute causes the implementation to behave as recommended (issuing diagnostic messages, affecting class layout, etc.).
The presence of vendor-specific attributes is determined by a non-zero value.
__has_cpp_attribute can be expanded in the expression of #if and #elif. It is treated as a defined macro by #ifdef, #ifndef, #elifdef, #elifndef (since C++23) and defined but cannot be used anywhere else.
| attribute-token | Attribute | Value | Standard | Paper(s) |
|---|---|---|---|---|
assume |
[[assume]] |
202207L | (C++23) | P1774R8 |
carries_dependency |
[[carries_dependency]] |
200809L | (C++11) | N2556, N2643 |
deprecated |
[[deprecated]] |
201309L | (C++14) | N3760 |
fallthrough |
[[fallthrough]] |
201603L | (C++17) | P0188R1 |
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 |
201907L | (C++20) | P1301R4 | ||
noreturn |
[[noreturn]] |
200809L | (C++11) | N2761 |
unlikely |
[[unlikely]] |
201803L | (C++20) | P0479R5 |
| Total number of attributes: 10 | ||||
The following macros are predefined in every translation unit. Each macro expands to an integer literal corresponding to the year and month when the corresponding feature has been included in the working draft.
When a feature changes significantly, the macro will be updated accordingly.
| Macro name | Feature | Value | Std | Paper(s) |
|---|---|---|---|---|
__cpp_aggregate_bases | Aggregate classes with base classes | 201603L | (C++17) | P0017R1 |
__cpp_aggregate_nsdmi | Aggregate classes with default member initializers | 201304L | (C++14) | N3653 |
__cpp_aggregate_paren_init | Aggregate initialization in the form of direct initialization | 201902L | (C++20) | P0960R3 |
__cpp_alias_templates | Alias templates | 200704L | (C++11) | N2258 |
__cpp_aligned_new | Dynamic memory allocation for over-aligned data | 201606L | (C++17) | P0035R4 |
__cpp_attributes | Attributes | 200809L | (C++11) | N2761 |
__cpp_auto_cast | auto(x) and auto{x} | 202110L | (C++23) | P0849R8 |
__cpp_binary_literals | Binary literals | 201304L | (C++14) | N3472 |
__cpp_capture_star_this | Lambda capture of *this by value as [=,*this] | 201603L | (C++17) | P0018R3 |
__cpp_char8_t | char8_t | 201811L | (C++20) | P0482R6 |
| char8_t compatibility and portability fix (allow initialization of (unsigned) char arrays from UTF-8 string literals) | 202207L | (C++20) (DR) | P2513R4 | |
__cpp_concepts | Concepts | 201907L | (C++20) | P0734R0 P1084R2 P1452R2 |
| Conditional trivial special member functions | 202002L | (C++20) | P0848R3 P2493R0 |
|
__cpp_conditional_explicit | explicit(bool) | 201806L | (C++20) | P0892R2 |
__cpp_consteval | Immediate functions | 201811L | (C++20) | P1073R3 |
Making consteval propagate up | 202211L | (C++20) (DR) | P2564R3 | |
__cpp_constexpr | constexpr | 200704L | (C++11) | N2235 |
Relaxed constexpr, non-const constexpr methods | 201304L | (C++14) | N3652 | |
| Constexpr lambda | 201603L | (C++17) | P0170R1 | |
| Virtual function calls in constant expressions | 201806L | (C++20) | P1064R0 | |
try-catch blocks in consexpr functions, dynamic_cast and polymorphic typeid in constant expressions | 201811L | (C++20) | P1002R1 P1327R1 |
|
| Trivial default initialization and asm-declaration in constexpr functions | 201907L | (C++20) | P1331R2 P1668R1 |
|
| Changing the active member of a union in constant evaluation | 202002L | (C++20) | P1330R0 | |
Non-literal variables, labels, and goto statements in constexpr functions | 202110L | (C++23) | P2242R3 | |
| Relaxing some restrictions on constexpr functions and function templates | 202207L | (C++23) | P2448R2 | |
| Permitting static constexpr variables in constexpr functions | 202211L | (C++23) | P2647R1 | |
__cpp_constexpr_dynamic_alloc | Operations for dynamic storage duration in constexpr functions | 201907L | (C++20) | P0784R7 |
__cpp_constexpr_in_decltype | Generation of function and variable definitions when needed for constant evaluation | 201711L | (C++11) (DR) | P0859R0 |
__cpp_constinit | constinit | 201907L | (C++20) | P1143R2 |
__cpp_decltype | decltype | 200707L | (C++11) | N2343 |
__cpp_decltype_auto | Return type deduction for normal functions | 201304L | (C++14) | N3638 |
__cpp_deduction_guides | Template argument deduction for class templates | 201703L | (C++17) | P0091R3 P0512R0 P0620R0 |
| CTAD for aggregates and aliases | 201907L | (C++20) | P1814R0 P1816R0 |
|
__cpp_delegating_constructors | Delegating constructors | 200604L | (C++11) | N1986 |
__cpp_designated_initializers | Designated initializer | 201707L | (C++20) | P0329R4 |
__cpp_enumerator_attributes | Attributes for enumerators | 201411L | (C++17) | N4266 |
__cpp_explicit_this_parameter | Explicit object parameter | 202110L | (C++23) | P0847R7 |
__cpp_fold_expressions | Fold expressions | 201603L | (C++17) | N4295 P0036R0 |
__cpp_generic_lambdas | Generic lambda expressions | 201304L | (C++14) | N3649 |
| Explicit template parameter list for generic lambdas | 201707L | (C++20) | P0428R2 | |
__cpp_guaranteed_copy_elision | Guaranteed copy elision through simplified value categories | 201606L | (C++17) | P0135R1 |
__cpp_hex_float | Hexadecimal floating literals | 201603L | (C++17) | P0245R1 |
__cpp_if_consteval | consteval if | 202106L | (C++23) | P1938R3 |
__cpp_if_constexpr | constexpr if | 201606L | (C++17) | P0292R2 |
__cpp_impl_coroutine | Coroutines (compiler support) | 201902L | (C++20) | P0912R5 LWG3393 |
__cpp_impl_destroying_delete | Destroying operator delete (compiler support) | 201806L | (C++20) | P0722R3 |
__cpp_impl_three_way_comparison | Three-way comparison (compiler support) | 201907L | (C++20) | P0515R3 P0768R1 P1185R2 P1630R1 |
__cpp_implicit_move | Simpler implicit move | 202207L | (C++23) | P2266R3 |
__cpp_inheriting_constructors | Inheriting constructors | 200802L | (C++11) | N2540 |
| Rewording inheriting constructors | 201511L | (C++11) (DR) | P0136R1 | |
__cpp_init_captures | Lambda init-capture | 201304L | (C++14) | N3648 |
| Allow pack expansion in lambda init-capture | 201803L | (C++20) | P0780R2 | |
__cpp_initializer_lists | List-initialization and std::initializer_list | 200806L | (C++11) | N2672 |
__cpp_inline_variables | Inline variables | 201606L | (C++17) | P0386R2 |
__cpp_lambdas | Lambda expressions | 200907L | (C++11) | N2927 |
__cpp_modules | Modules | 201907L | (C++20) | P1103R3 P1811R0 |
__cpp_multidimensional_subscript | Multidimensional subscript operator | 202110L | (C++23) | P2128R6 |
static operator[] | 202211L | (C++23) | P2589R1 | |
__cpp_named_character_escapes | Named universal character escapes | 202207L | (C++23) | P2071R2 |
__cpp_namespace_attributes | Attributes for namespaces | 201411L | (C++17) | N4266 |
__cpp_noexcept_function_type | Make exception specifications be part of the type system | 201510L | (C++17) | P0012R1 |
__cpp_nontype_template_args | Allow constant evaluation for all non-type template arguments | 201411L | (C++17) | N4268 |
| Class types and floating-point types in non-type template parameters | 201911L | (C++20) | P1907R1 | |
__cpp_nontype_template_parameter_auto | Declaring non-type template parameters with auto | 201606L | (C++17) | P0127R2 |
__cpp_nsdmi | Non-static data member initializers | 200809L | (C++11) | N2756 |
__cpp_range_based_for | Range-based for loop | 200907L | (C++11) | N2930 |
Range-based for loop with different begin/end types | 201603L | (C++17) | P0184R0 | |
Lifetime extension in range-based for | 202211L | (C++23) | P2718R0 | |
__cpp_raw_strings | Raw string literals | 200710L | (C++11) | N2442 |
__cpp_ref_qualifiers | ref-qualifiers | 200710L | (C++11) | N2439 |
__cpp_return_type_deduction | Return type deduction for normal functions | 201304L | (C++14) | N3638 |
__cpp_rvalue_references | Rvalue reference | 200610L | (C++11) | N2118 |
__cpp_size_t_suffix | Literal suffixes for size_t and its signed version | 202011L | (C++23) | P0330R8 |
__cpp_sized_deallocation | Sized deallocation | 201309L | (C++14) | N3778 |
__cpp_static_assert | static_assert | 200410L | (C++11) | N1720 |
Single-argument static_assert | 201411L | (C++17) | N3928 | |
__cpp_static_call_operator | static operator() | 202207L | (C++23) | P1169R4 |
__cpp_structured_bindings | Structured bindings | 201606L | (C++17) | P0217R3 |
__cpp_template_template_args | Matching of template template-arguments | 201611L | (C++17) | P0522R0 |
__cpp_threadsafe_static_init | Dynamic initialization and destruction with concurrency | 200806L | (C++11) | N2660 |
__cpp_unicode_characters | New character types (char16_t and char32_t) | 200704L | (C++11) | N2249 |
__cpp_unicode_literals | Unicode string literals | 200710L | (C++11) | N2442 |
__cpp_user_defined_literals | User-defined literals | 200809L | (C++11) | N2765 |
__cpp_using_enum | using enum | 201907L | (C++20) | P1099R5 |
__cpp_variable_templates | Variable templates | 201304L | (C++14) | N3651 |
__cpp_variadic_templates | Variadic templates | 200704L | (C++11) | N2242 |
__cpp_variadic_using | Pack expansions in using-declarations | 201611L | (C++17) | P0195R2 |
| Total number of macros: 66 | ||||
The following macros are defined if the header <version> or any of the corresponding headers in the table below is included. Each macro expands to an integer literal corresponding to the year and month when the corresponding feature has been included in the working draft.
When a feature changes significantly, the macro will be updated accordingly.
| Macro name | Feature | Value | Header | Std | Paper(s) |
|---|---|---|---|---|---|
__cpp_lib_adaptor_iterator_pair_constructor | Iterator pair constructors for std::stack and std::queue | 202106L | <queue> <stack> | (C++23) | P1425R4 |
__cpp_lib_addressof_constexpr | Constexpr std::addressof | 201603L | <memory> | (C++17) | LWG2296 |
__cpp_lib_algorithm_iterator_requirements | Ranges iterators as inputs to non-Ranges algorithms | 202207L | <algorithm> <memory> <numeric> | (C++23) | P2408R5 |
__cpp_lib_allocate_at_least | Size-feedback in the Allocator interface, e.g.: std::allocator::allocate_at_least, std::allocator_traits::allocate_at_least | 202302L | <memory> | (C++23) | P0401R6 P2652R2 |
__cpp_lib_allocator_traits_is_always_equal | std::allocator_traits::is_always_equal | 201411L | <memory> <scoped_allocator> <string> <deque> <forward_list> <list> <vector> <map> <set> <unordered_map> <unordered_set> | (C++17) | N4258 |
__cpp_lib_any | std::any | 201606L | <any> | (C++17) | P0220R1 P0032R3 |
__cpp_lib_apply | std::apply | 201603L | <tuple> | (C++17) | P0220R1 |
__cpp_lib_array_constexpr | Constexpr for std::reverse_iterator, std::move_iterator, std::array and range access | 201603L | <iterator> <array> | (C++17) | P0031R0 |
ConstexprIterator; constexpr comparison for std::array; misc constexpr bits (std::array::fill et al.) | 201811L | <iterator> <array> | (C++20) | P0858R0 LWG3257 P1023R0 P1032R1 |
|
__cpp_lib_as_const | std::as_const | 201510L | <utility> | (C++17) | P0007R1 |
__cpp_lib_associative_heterogeneous_erasure | Heterogeneous erasure in associative containers and unordered associative containers | 202110L | <map> <set> <unordered_map> <unordered_set> | (C++23) | P2077R3 |
__cpp_lib_assume_aligned | std::assume_aligned | 201811L | <memory> | (C++20) | P1007R3 |
__cpp_lib_atomic_flag_test | std::atomic_flag::test | 201907L | <atomic> | (C++20) | P1135R6 |
__cpp_lib_atomic_float | Floating-point atomic | 201711L | <atomic> | (C++20) | P0020R6 |
__cpp_lib_atomic_is_always_lock_free | constexpr atomic<T>::is_always_lock_free | 201603L | <atomic> | (C++17) | P0152R1 |
__cpp_lib_atomic_lock_free_type_aliases | atomic lockfree integral types (std::atomic_signed_lock_free, std::atomic_unsigned_lock_free) | 201907L | <atomic> | (C++20) | P1135R6 |
__cpp_lib_atomic_ref | std::atomic_ref | 201806L | <atomic> | (C++20) | P0019R8 |
__cpp_lib_atomic_shared_ptr | std::atomic<std::shared_ptr> | 201711L | <memory> | (C++20) | P0718R2 |
__cpp_lib_atomic_value_initialization | Fixing atomic initialization (value-initialize std::atomic by default) | 201911L | <atomic> <memory> | (C++20) | P0883R2 |
__cpp_lib_atomic_wait | Efficient std::atomic waiting | 201907L | <atomic> | (C++20) | P1135R6 |
__cpp_lib_barrier | std::barrier | 201907L | <barrier> | (C++20) | P1135R6 |
std::barrier's phase completion guarantees | 202302L | <barrier> | (C++23) | P2588R3 | |
__cpp_lib_bind_back | std::bind_back | 202202L | <functional> | (C++23) | P2387R3 |
__cpp_lib_bind_front | std::bind_front | 201907L | <functional> | (C++20) | P0356R5 P1651R0 |
__cpp_lib_bit_cast | std::bit_cast | 201806L | <bit> | (C++20) | P0476R2 |
__cpp_lib_bitops | Bit operations | 201907L | <bit> | (C++20) | P0553R4 |
__cpp_lib_bool_constant | std::bool_constant | 201505L | <type_traits> | (C++17) | N4389 |
__cpp_lib_bounded_array_traits | std::is_bounded_array, std::is_unbounded_array | 201902L | <type_traits> | (C++20) | P1357R1 |
__cpp_lib_boyer_moore_searcher | Searchers | 201603L | <functional> | (C++17) | P0220R1 |
__cpp_lib_byte | std::byte | 201603L | <cstddef> | (C++17) | P0298R3 |
__cpp_lib_byteswap | std::byteswap | 202110L | <bit> | (C++23) | P1272R4 |
__cpp_lib_char8_t | Library support for char8_t | 201907L | <atomic> <filesystem> <istream> <limits> <locale> <ostream> <string> <string_view> | (C++20) | P0482R6 P1423R3 |
__cpp_lib_chrono | Rounding functions for std::chrono::duration and std::chrono::time_point | 201510L | <chrono> | (C++17) | P0092R1 |
Constexpr for all the member functions of std::chrono::duration and std::chrono::time_point | 201611L | <chrono> | (C++17) | P0505R0 | |
| Calendars and Time Zones | 201907L | <chrono> | (C++20) | P0355R7 P1466R3 |
|
__cpp_lib_chrono_udls | User-defined literals for time types | 201304L | <chrono> | (C++14) | N3642 |
__cpp_lib_clamp | std::clamp | 201603L | <algorithm> | (C++17) | P0025R0 |
__cpp_lib_common_reference | Make std::common_reference_t of std::reference_wrapper a reference type | 202302L | <type_traits> | (C++23) | P2655R3 |
__cpp_lib_common_reference_wrapper | Make std::common_reference_t of std::reference_wrapper a reference type | 202302L | <functional> | (C++23) | P2655R3 |
__cpp_lib_complex_udls | User-defined Literals for std::complex | 201309L | <complex> | (C++14) | N3779 |
__cpp_lib_concepts | Standard library concepts | 202002L | <concepts> | (C++20) | P0898R3 P1754R1 P1964R2 |
Move-only types for equality_comparable_with, totally_ordered_with, and three_way_comparable_with | 202207L | <compare> <concepts> | (C++23) | P2404R3 | |
__cpp_lib_constexpr_algorithms | Constexpr for algorithms | 201806L | <algorithm> | (C++20) | P0202R3 P0879R0 LWG3256 |
| Constexpr stable sorting | 202306L? | <algorithm> | (C++26) | P2562R1 | |
__cpp_lib_constexpr_bitset | A more constexpr std::bitset | 202207L | <bitset> | (C++23) | P2417R2 |
__cpp_lib_constexpr_charconv | Add constexpr modifiers to functions std::to_chars and std::from_chars for integral types | 202207L | <charconv> | (C++23) | P2291R3 |
__cpp_lib_constexpr_cmath | Constexpr for mathematical functions in <cmath> and <cstdlib> | 202202L | <cmath> <cstdlib> | (C++23) | P0533R9 |
__cpp_lib_constexpr_complex | Constexpr for std::complex | 201711L | <complex> | (C++20) | P0415R1 |
__cpp_lib_constexpr_dynamic_alloc | Constexpr for std::allocator and related utilities | 201907L | <memory> | (C++20) | P0784R7 |
__cpp_lib_constexpr_functional | Misc constexpr bits (std::default_searcher); constexpr INVOKE | 201907L | <functional> | (C++20) | P1032R1 P1065R2 |
__cpp_lib_constexpr_iterator | Misc constexpr bits (std::insert_iterator et al.) | 201811L | <iterator> | (C++20) | P1032R1 |
__cpp_lib_constexpr_memory | Constexpr in std::pointer_traits | 201811L | <memory> | (C++20) | P1006R1 |
Constexpr std::unique_ptr | 202202L | <memory> | (C++23) | P2273R3 | |
__cpp_lib_constexpr_numeric | Constexpr for algorithms in <numeric> | 201911L | <numeric> | (C++20) | P1645R1 |
__cpp_lib_constexpr_string | Constexpr for std::string | 201907L | <string> | (C++20) | P0426R1 P1032R1 P0980R1 |
__cpp_lib_constexpr_string_view | Misc constexpr bits (std::string_view::copy) | 201811L | <string_view> | (C++20) | P0426R1 P1032R1 |
__cpp_lib_constexpr_tuple | Misc constexpr bits (std::tuple::operator= et al.) | 201811L | <tuple> | (C++20) | P1032R1 |
__cpp_lib_constexpr_typeinfo | Constexpr for std::type_info::operator== | 202106L | <typeinfo> | (C++23) | P1328R1 |
__cpp_lib_constexpr_utility | Misc constexpr bits (std::pair::operator= et al.) | 201811L | <utility> | (C++20) | P1032R1 |
__cpp_lib_constexpr_vector | Constexpr for std::vector | 201907L | <vector> | (C++20) | P1004R2 |
__cpp_lib_containers_ranges | Ranges-aware construction and insertion for containers and strings | 202202L | <vector> <list> <forward_list> <map> <set> <unordered_map> <unordered_set> <deque> <queue> <stack> <string> | (C++23) | P1206R7 |
__cpp_lib_coroutine | Coroutines (library support) | 201902L | <coroutine> | (C++20) | P0912R5 LWG3393 |
__cpp_lib_destroying_delete | Destroying operator delete (library support) | 201806L | <new> | (C++20) | P0722R3 |
__cpp_lib_enable_shared_from_this | std::enable_shared_from_this::weak_from_this | 201603L | <memory> | (C++17) | P0033R1 |
__cpp_lib_endian | std::endian | 201907L | <bit> | (C++20) | P0463R1 P1612R1 |
__cpp_lib_erase_if | Uniform container erasure | 202002L | <string> <deque> <forward_list> <list> <vector> <map> <set> <unordered_map> <unordered_set> | (C++20) | P1209R0 P1115R3 |
__cpp_lib_exchange_function | std::exchange | 201304L | <utility> | (C++14) | N3668 |
__cpp_lib_execution | Execution policies | 201603L | <execution> | (C++17) | P0024R2 |
std::execution::unsequenced_policy | 201902L | <execution> | (C++20) | P1001R2 | |
__cpp_lib_expected | class template std::expected | 202202L | <expected> | (C++23) | P0323R12 |
Monadic functions for std::expected | 202211L | <expected> | (C++23) | P2505R5 | |
__cpp_lib_filesystem | Filesystem library | 201703L | <filesystem> | (C++17) | P0218R1 P0219R1 P0392R0 P0317R1 |
__cpp_lib_flat_map | std::flat_map and std::flat_multimap | 202207L | <flat_map> | (C++23) | P0429R9 |
__cpp_lib_flat_set | std::flat_set and std::flat_multiset | 202207L | <flat_set> | (C++23) | P1222R4 LWG3751 |
__cpp_lib_format | Text formatting | 201907L | <format> | (C++20) | P0645R10 P1361R2 P1652R1 |
Compile-time format string checks; Reducing parameterization of std::vformat_to | 202106L | <format> | (C++20) (DR) | P2216R3 | |
| Fixing locale handling in chrono formatters; Supporting non-const-formattable types | 202110L | <format> | (C++20) (DR) | P2372R3 P2418R2 |
|
Exposing std::basic_format_string; clarify handling of encodings in localized formatting of chrono types | 202207L | <format> | (C++23) | P2419R2 P2508R1 |
|
__cpp_lib_format_ranges | Formatting ranges | 202207L | <format> | (C++23) | P2286R8 P2585R1 LWG3750 |
__cpp_lib_formatters | Formatting std::thread::id and std::stacktrace | 202302L | <stacktrace> <thread> | (C++23) | P2693R1 |
__cpp_lib_forward_like | std::forward_like | 202207L | <utility> | (C++23) | P2445R1 |
__cpp_lib_gcd_lcm | std::gcd, std::lcm | 201606L | <numeric> | (C++17) | P0295R0 |
__cpp_lib_generator | std::generator: synchronous coroutine generator for ranges | 202207L | <generator> | (C++23) | P2502R2 |
__cpp_lib_generic_associative_lookup | Heterogeneous comparison lookup in associative containers | 201304L | <map> <set> | (C++14) | N3657 |
__cpp_lib_generic_unordered_lookup | Heterogeneous comparison lookup in unordered associative containers | 201811L | <unordered_map> <unordered_set> | (C++20) | P0919R3 |
__cpp_lib_hardware_interference_size | constexpr std::hardware_{constructive, destructive}_interference_size | 201703L | <new> | (C++17) | P0154R1 |
__cpp_lib_has_unique_object_representations | std::has_unique_object_representations | 201606L | <type_traits> | (C++17) | P0258R2 |
__cpp_lib_hypot | 3-argument overload of std::hypot | 201603L | <cmath> | (C++17) | P0030R1 |
__cpp_lib_incomplete_container_elements | Minimal incomplete type support for std::forward_list, std::list, and std::vector | 201505L | <forward_list> <list> <vector> | (C++17) | N4510 |
__cpp_lib_int_pow2 | Integral power-of-2 operations (std::has_single_bit, std::bit_ceil, std::bit_floor, std::bit_width) | 202002L | <bit> | (C++20) | P0556R3 P1956R1 |
__cpp_lib_integer_comparison_functions | Integer comparison functions | 202002L | <utility> | (C++20) | P0586R2 |
__cpp_lib_integer_sequence | Compile-time integer sequences | 201304L | <utility> | (C++14) | N3658 |
__cpp_lib_integral_constant_callable | std::integral_constant::operator() | 201304L | <type_traits> | (C++14) | N3545 |
__cpp_lib_interpolate | std::lerp, std::midpoint | 201902L | <cmath> <numeric> | (C++20) | P0811R3 |
__cpp_lib_invoke | std::invoke | 201411L | <functional> | (C++17) | N4169 |
__cpp_lib_invoke_r | std::invoke_r | 202106L | <functional> | (C++23) | P2136R3 |
__cpp_lib_ios_noreplace | Support exclusive mode for fstreams | 202207L | <ios> | (C++23) | P2467R1 |
__cpp_lib_is_aggregate | std::is_aggregate | 201703L | <type_traits> | (C++17) | LWG2911 |
__cpp_lib_is_constant_evaluated | std::is_constant_evaluated | 201811L | <type_traits> | (C++20) | P0595R2 |
__cpp_lib_is_final | std::is_final | 201402L | <type_traits> | (C++14) | LWG2112 |
__cpp_lib_is_implicit_lifetime | std::is_implicit_lifetime | 202302L | <type_traits> | (C++23) | P2674R1 |
__cpp_lib_is_invocable | std::is_invocable, std::invoke_result | 201703L | <type_traits> | (C++17) | P0604R0 |
__cpp_lib_is_layout_compatible | std::is_layout_compatible | 201907L | <type_traits> | (C++20) | P0466R5 |
__cpp_lib_is_nothrow_convertible | std::is_nothrow_convertible | 201806L | <type_traits> | (C++20) | P0758R1 LWG3356 |
__cpp_lib_is_null_pointer | std::is_null_pointer | 201309L | <type_traits> | (C++14) | LWG2247 |
__cpp_lib_is_pointer_interconvertible | Pointer-interconvertibility traits: std::is_pointer_interconvertible_with_class, std::is_pointer_interconvertible_base_of | 201907L | <type_traits> | (C++20) | P0466R5 |
__cpp_lib_is_scoped_enum | std::is_scoped_enum | 202011L | <type_traits> | (C++23) | P1048R1 |
__cpp_lib_is_swappable | [nothrow-]swappable traits | 201603L | <type_traits> | (C++17) | P0185R1 |
__cpp_lib_jthread | Stop token and joining thread | 201911L | <stop_token> <thread> | (C++20) | P0660R10 P1869R1 |
__cpp_lib_latch | std::latch | 201907L | <latch> | (C++20) | P1135R6 |
__cpp_lib_launder | Core Issue 1776: Replacement of class objects containing reference members (std::launder) | 201606L | <new> | (C++17) | P0137R1 |
__cpp_lib_list_remove_return_type | Change the return type of the remove(), remove_if() and unique() members of std::forward_list and std::list | 201806L | <forward_list> <list> | (C++20) | P0646R1 |
__cpp_lib_logical_traits | Logical operations on type traits | 201510L | <type_traits> | (C++17) | P0013R1 |
__cpp_lib_make_from_tuple | std::make_from_tuple() | 201606L | <tuple> | (C++17) | P0209R2 |
__cpp_lib_make_reverse_iterator | std::make_reverse_iterator | 201402L | <iterator> | (C++14) | LWG2285 |
__cpp_lib_make_unique | std::make_unique | 201304L | <memory> | (C++14) | N3656 |
__cpp_lib_map_try_emplace | std::map::try_emplace, std::map::insert_or_assign | 201411L | <map> | (C++17) | N4279 |
__cpp_lib_math_constants | Mathematical constants | 201907L | <numbers> | (C++20) | P0631R8 |
__cpp_lib_math_special_functions | Mathematical special functions for C++17 | 201603L | <cmath> | (C++17) | P0226R1 |
__cpp_lib_mdspan | std::mdspan | 202207L | <mdspan> | (C++23) | P0009R18 P2599R2 P2604R0 P2613R1 |
__cpp_lib_memory_resource | std::pmr::memory_resource | 201603L | <memory_resource> | (C++17) | P0220R1 |
__cpp_lib_modules | Standard library modules std and std.compat | 202207L | (C++23) | P2465R3 | |
__cpp_lib_move_iterator_concept | Make std::move_iterator<T*> a random access iterator | 202207L | <iterator> | (C++23) | P2520R0 |
__cpp_lib_move_only_function | std::move_only_function | 202110L | <functional> | (C++23) | P0288R9 |
__cpp_lib_node_extract | Splicing maps and sets (std::map::extract, std::map::merge, std::map::insert(node_type), etc) | 201606L | <map> <set> <unordered_map> <unordered_set> | (C++17) | P0083R3 |
__cpp_lib_nonmember_container_access | std::size(), std::data() and std::empty() | 201411L | <iterator> <array> <deque> <forward_list> <list> <map> <regex> <set> <string> <unordered_map> <unordered_set> <vector> | (C++17) | N4280 |
__cpp_lib_not_fn | std::not_fn() | 201603L | <functional> | (C++17) | P0005R4 |
__cpp_lib_null_iterators | Null LegacyForwardIterators | 201304L | <iterator> | (C++14) | N3644 |
__cpp_lib_optional | std::optional | 201606L | <optional> | (C++17) | P0220R1 P0032R3 P0307R2 |
Fully constexpr std::optional | 202106L | <optional> | (C++20) (DR) | P2231R1 | |
Monadic operations in std::optional | 202110L | <optional> | (C++23) | P0798R8 LWG3621 |
|
__cpp_lib_out_ptr | std::out_ptr, std::inout_ptr | 202106L | <memory> | (C++23) | P1132R7 |
__cpp_lib_parallel_algorithm | Parallel algorithms | 201603L | <algorithm> <numeric> | (C++17) | P0024R2 |
__cpp_lib_polymorphic_allocator | std::pmr::polymorphic_allocator<> as a vocabulary type | 201902L | <memory_resource> | (C++20) | P0339R6 LWG3437 |
__cpp_lib_print | Formatted output | 202207L | <ostream> <print> | (C++23) | P2093R14 |
__cpp_lib_quoted_string_io | std::quoted | 201304L | <iomanip> | (C++14) | N3654 |
__cpp_lib_ranges | Ranges library and constrained algorithms | 201911L | <algorithm> <functional> <iterator> <memory> <ranges> | (C++20) | P0896R4 P1035R7 P1716R3 |
| Non-default-initializable views | 202106L | (C++20) (DR) | P2325R3 | ||
| Views with ownership | 202110L | (C++20) (DR) | P2415R2 | ||
std::ranges::range_adaptor_closure | 202202L | (C++23) | P2387R3 | ||
| Relaxing range adaptors to allow for move-only types | 202207L | (C++23) | P2494R2 | ||
Removing 'poison pill' overloads in ranges::begin, ranges::end, ranges::rbegin, ranges::rend, and ranges::size | 202211L | (C++23) | P2602R2 | ||
| Relaxing ranges to allow certain projections | 202302L | (C++23) | P2609R3 | ||
__cpp_lib_ranges_as_const | std::const_iterator, std::ranges::as_const_view | 202207L | <ranges> | (C++23) | P2278R4 |
__cpp_lib_ranges_as_rvalue | std::ranges::as_rvalue_view | 202207L | <ranges> | (C++23) | P2446R2 |
__cpp_lib_ranges_cartesian_product | std::ranges::cartesian_product_view | 202207L | <ranges> | (C++23) | P2374R4 P2540R1 |
__cpp_lib_ranges_chunk | std::ranges::chunk_view | 202202L | <ranges> | (C++23) | P2442R1 |
__cpp_lib_ranges_chunk_by | std::ranges::chunk_by_view | 202202L | <ranges> | (C++23) | P2443R1 |
__cpp_lib_ranges_contains | std::ranges::contains | 202207L | <algorithm> | (C++23) | P2302R4 |
__cpp_lib_ranges_enumerate | std::ranges::enumerate_view | 202302L | <ranges> | (C++23) | P2164R9 |
__cpp_lib_ranges_find_last | std::find_last(), std::find_last(), and std::find_last() | 202207L | <algorithm> | (C++23) | P1223R5 |
__cpp_lib_ranges_fold | std::ranges fold algorithms | 202207L | <algorithm> | (C++23) | P2322R6 |
__cpp_lib_ranges_iota | std::ranges::iota | 202202L | <numeric> | (C++23) | P2440R1 |
__cpp_lib_ranges_join_with | std::ranges::join_with_view | 202202L | <ranges> | (C++23) | P2441R2 |
__cpp_lib_ranges_repeat | std::ranges::repeat_view | 202207L | <ranges> | (C++23) | P2474R2 |
__cpp_lib_ranges_slide | std::ranges::slide_view | 202202L | <ranges> | (C++23) | P2442R1 |
__cpp_lib_ranges_starts_ends_with | std::ranges::starts_with, std::ranges::ends_with | 202106L | <algorithm> | (C++23) | P1659R3 |
__cpp_lib_ranges_stride | std::ranges::stride_view | 202207L | <ranges> | (C++23) | P1899R3 |
__cpp_lib_ranges_to_container | std::ranges::to | 202202L | <ranges> | (C++23) | P1206R7 |
__cpp_lib_ranges_zip | std::ranges::zip_view, std::ranges::zip_transform_view, std::ranges::adjacent_view, std::ranges::adjacent_transform_view | 202110L | <ranges> <tuple> <utility> | (C++23) | P2321R2 |
__cpp_lib_raw_memory_algorithms | Extending memory management tools | 201606L | <memory> | (C++17) | P0040R3 |
__cpp_lib_reference_from_temporary | std::reference_constructs_from_temporary and std::reference_converts_from_temporary | 202202L | <type_traits> | (C++23) | P2255R2 |
__cpp_lib_remove_cvref | std::remove_cvref | 201711L | <type_traits> | (C++20) | P0550R2 |
__cpp_lib_result_of_sfinae | std::result_of and SFINAE | 201210L | <type_traits> <functional> | (C++14) | N3462 |
__cpp_lib_robust_nonmodifying_seq_ops | Making non-modifying sequence operations more robust (two-range overloads for std::mismatch, std::equal and std::is_permutation) | 201304L | <algorithm> | (C++14) | N3671 |
__cpp_lib_sample | std::sample | 201603L | <algorithm> | (C++17) | P0220R1 |
__cpp_lib_scoped_lock | std::scoped_lock | 201703L | <mutex> | (C++17) | P0156R2 |
__cpp_lib_semaphore | std::counting_semaphore, std::binary_semaphore | 201907L | <semaphore> | (C++20) | P1135R6 |
__cpp_lib_shared_mutex | std::shared_mutex (untimed) | 201505L | <shared_mutex> | (C++17) | N4508 |
__cpp_lib_shared_ptr_arrays | std::shared_ptr<T[]> | 201611L | <memory> | (C++17) | P0497R0 |
Array support of std::make_shared | 201707L | <memory> | (C++20) | P0674R1 | |
__cpp_lib_shared_ptr_weak_type | shared_ptr::weak_type | 201606L | <memory> | (C++17) | P0163R0 |
__cpp_lib_shared_timed_mutex | std::shared_timed_mutex | 201402L | <shared_mutex> | (C++14) | N3891 |
__cpp_lib_shift | std::shift_left and std::shift_right | 201806L | <algorithm> | (C++20) | P0769R2 |
std::ranges::shift_left and std::ranges::shift_right | 202202L | <algorithm> | (C++23) | P2440R1 | |
__cpp_lib_smart_ptr_for_overwrite | Smart pointer creation with default initialization (std::allocate_shared_for_overwrite, std::make_shared_for_overwrite, std::make_unique_for_overwrite) | 202002L | <memory> | (C++20) | P1020R1 P1973R1 |
__cpp_lib_source_location | Source-code information capture (std::source_location) | 201907L | <source_location> | (C++20) | P1208R6 |
__cpp_lib_span | std::span | 202002L | <span> | (C++20) | P0122R7 LWG3274 P1024R3 P1976R2 |
__cpp_lib_spanstream | std::spanbuf, std::spanstream | 202106L | <spanstream> | (C++23) | P0448R4 |
__cpp_lib_ssize | std::ssize and unsigned std::span::size | 201902L | <iterator> | (C++20) | P1227R2 |
__cpp_lib_stacktrace | Stacktrace library | 202011L | <stacktrace> | (C++23) | P0881R7 |
__cpp_lib_start_lifetime_as | Explicit lifetime management (std::start_lifetime_as) | 202207L | <memory> | (C++23) | P2590R2 |
__cpp_lib_starts_ends_with | String prefix and suffix checking (starts_with() and ends_with() for std::string and std::string_view) | 201711L | <string> <string_view> | (C++20) | P0457R2 |
__cpp_lib_stdatomic_h | Compatibility header for C atomic operations | 202011L | <stdatomic.h> | (C++23) | P0943R6 |
__cpp_lib_string_contains | contains functions of std::basic_string and std::basic_string_view | 202011L | <string> <string_view> | (C++23) | P1679R3 |
__cpp_lib_string_resize_and_overwrite | std::basic_string::resize_and_overwrite | 202110L | <string> | (C++23) | P1072R10 |
__cpp_lib_string_udls | User-defined literals for string types | 201304L | <string> | (C++14) | N3642 |
__cpp_lib_string_view | std::string_view | 201606L | <string> <string_view> | (C++17) | P0220R1 P0254R2 |
| ConstexprIterator | 201803L | <string> <string_view> | (C++20) | P0858R0 LWG3257 |
|
__cpp_lib_syncbuf | Synchronized buffered ostream (std::syncbuf, std::osyncstream) and manipulators | 201803L | <syncstream> | (C++20) | P0053R7 P0753R2 |
__cpp_lib_three_way_comparison | Three-way comparison (library support); adding three-way comparison to the library | 201907L | <compare> | (C++20) | P0768R1 P1614R2 |
__cpp_lib_to_address | Utility to convert a pointer to a raw pointer (std::to_address) | 201711L | <memory> | (C++20) | P0653R2 |
__cpp_lib_to_array | std::to_array | 201907L | <array> | (C++20) | P0325R4 |
__cpp_lib_to_chars | Elementary string conversions (std::to_chars, std::from_chars) | 201611L | <charconv> | (C++17) | P0067R5 P0682R1 LWG3137 |
__cpp_lib_to_underlying | std::to_underlying | 202102L | <utility> | (C++23) | P1682R2 |
__cpp_lib_transformation_trait_aliases | Alias templates for TransformationTraits | 201304L | <type_traits> | (C++14) | N3655 |
__cpp_lib_transparent_operators | Transparent operator functors (std::less<> et al) | 201210L | <functional> | (C++14) | N3421 |
Transparent std::owner_less (std::owner_less<void>) | 201510L | <memory> <functional> | (C++17) | P0074R0 | |
__cpp_lib_tuple_element_t | std::tuple_element_t | 201402L | <tuple> | (C++14) | N3887 |
__cpp_lib_tuple_like | Compatibility between std::tuple and tuple-like objects (std::pair, std::array, std::subrange) | 202207L | <map> <tuple> <unordered_map> <utility> | (C++23) | P2165R4 |
__cpp_lib_tuples_by_type | Addressing tuples by type | 201304L | <tuple> <utility> | (C++14) | N3670 |
__cpp_lib_type_identity | std::type_identity | 201806L | <type_traits> | (C++20) | P0887R1 |
__cpp_lib_type_trait_variable_templates | Type traits variable templates (std::is_void_v, etc) | 201510L | <type_traits> | (C++17) | P0006R0 |
__cpp_lib_uncaught_exceptions | std::uncaught_exceptions | 201411L | <exception> | (C++17) | N4259 |
__cpp_lib_unordered_map_try_emplace | std::unordered_map::try_emplace, std::unordered_map::insert_or_assign | 201411L | <unordered_map> | (C++17) | N4279 |
__cpp_lib_unreachable | std::unreachable | 202202L | <utility> | (C++23) | P0627R6 |
__cpp_lib_unwrap_ref | std::unwrap_ref_decay and std::unwrap_reference | 201811L | <type_traits> | (C++20) | P0318R1 LWG3348 |
__cpp_lib_variant | std::variant: a type-safe union for C++17 | 201606L | <variant> | (C++17) | P0088R3 P0393R3 P0032R3 |
std::visit for classes derived from std::variant | 202102L | <variant> | (C++17) (DR) | P2162R2 | |
Fully constexpr std::variant | 202106L | <variant> | (C++20) (DR) | P2231R1 | |
__cpp_lib_void_t | std::void_t | 201411L | <type_traits> | (C++17) | N3911 |
| Total number of macros: 185 | |||||
#ifdef __has_include // Check if __has_include is present
# if __has_include(<optional>) // Check for a standard library
# include <optional>
# elif __has_include(<experimental/optional>) // Check for an experimental version
# include <experimental/optional>
# elif __has_include(<boost/optional.hpp>) // Try with an external library
# include <boost/optional.hpp>
# else // Not found at all
# error "Missing <optional>"
# endif
#endif
#ifdef __has_cpp_attribute // Check if __has_cpp_attribute is present
# if __has_cpp_attribute(deprecated) // Check for an attribute
# define DEPRECATED(msg) [[deprecated(msg)]]
# endif
#endif
#ifndef DEPRECATED
# define DEPRECATED(msg)
#endif
DEPRECATED("foo() has been deprecated") void foo();
#if __cpp_constexpr >= 201304 // Check for a specific version of a feature
# define CONSTEXPR constexpr
#else
# define CONSTEXPR inline
#endif
CONSTEXPR int bar(unsigned i)
{
#if __cpp_binary_literals // Check for the presence of a feature
unsigned mask1 = 0b11000000;
unsigned mask2 = 0b00000111;
#else
unsigned mask1 = 0xC0;
unsigned mask2 = 0x07;
#endif
if ( i & mask1 )
return 1;
if ( i & mask2 )
return 2;
return 0;
}
int main()
{
}The following (C++11 compatible) program dumps C++ compiler features and attributes.
static constexpr struct change_these_options_to_select_what_will_be_printed
{
constexpr static int longest_macro_name { 44 };
constexpr static bool titles = 1;
constexpr static bool counters = 1;
constexpr static bool attributes = 1;
constexpr static bool standard_values = 1;
constexpr static bool compiler_specific = 1;
constexpr static bool core_features = 1;
constexpr static bool lib_features = 1;
constexpr static bool supported_features = 1;
constexpr static bool unsupported_features = 1;
constexpr static bool sort_by_date = 0;
constexpr static bool separate_year_month = 1;
constexpr static bool separated_revisions = 1;
constexpr static bool latest_revisions = 1;
constexpr static bool cxx98 = 0;
constexpr static bool cxx11 = 1;
constexpr static bool cxx14 = 1;
constexpr static bool cxx17 = 1;
constexpr static bool cxx20 = 1;
constexpr static bool cxx23 = 1;
constexpr static bool cxx26 = 0;
constexpr static bool 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
#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 },
#ifdef __has_cpp_attribute
# 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
{
char const* name_; long data_; long std_;
public:
constexpr CompilerFeature(char const* 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
{ return std::strcmp(name_, rhs.name_) < 0; }
bool operator==(CompilerFeature const& rhs) const
{ return std::strcmp(name_, rhs.name_) == 0; }
constexpr bool supported() const { return data_ >= std_; }
constexpr bool maybe() const { return data_ > 0; }
constexpr char const* name() const { return name_; }
constexpr long std() const { return std_; }
constexpr long data() const { return data_; }
void data(long x) { data_ = x; }
};
static /*constexpr*/ std::pair<const char*, const char*> 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__)
// Add your favorite compiler specific macros. Undefined ones will not be printed.
};
static constexpr CompilerFeature cxx98_core[] = {
COMPILER_FEATURE_ENTRY(199711L, __cpp_exceptions)
COMPILER_FEATURE_ENTRY(199711L, __cpp_rtti)
};
static constexpr 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)
};
static constexpr 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)
};
static constexpr 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)
};
static constexpr 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)
};
static constexpr 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)
};
static constexpr 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)
};
static constexpr 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)
};
static constexpr 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)
};
static constexpr 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)
};
static constexpr CompilerFeature cxx26_core[] = {
//< Continue to Populate
COMPILER_FEATURE_ENTRY(202304L, __cpp_core_TODO)
};
static constexpr CompilerFeature cxx26_lib[] = {
//< Continue to Populate
COMPILER_FEATURE_ENTRY(202304L, __cpp_lib_TODO)
COMPILER_FEATURE_ENTRY(202306L, __cpp_lib_constexpr_algorithms)
};
static constexpr CompilerFeature cxx29_core[] = {
//< Continue to Populate
COMPILER_FEATURE_ENTRY(202604L, __cpp_core_TODO)
};
static constexpr CompilerFeature cxx29_lib[] = {
//< Continue to Populate
COMPILER_FEATURE_ENTRY(202604L, __cpp_lib_TODO)
};
static constexpr CompilerFeature attributes[] = {
COMPILER_ATTRIBUTE(202207L, assume)
COMPILER_ATTRIBUTE(200809L, carries_dependency)
COMPILER_ATTRIBUTE(201309L, deprecated)
COMPILER_ATTRIBUTE(201603L, fallthrough)
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)
};
inline void show_compiler_specific_info()
{
std::printf("Compiler specific 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);
}
inline void 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)
{
return std::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>
inline void show(char const* const title, Container const& co)
{
if (print.titles)
{
std::printf("%-s (", title);
if (print.counters)
{
std::printf("%ld/", 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);
}
else
std::for_each(std::begin(co), std::end(co), print_compiler_feature);
std::puts("");
}
inline void 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);
else if (i->data() < x.data())
i->data(x.data());
};
char text[64];
latest.reserve(512); // max macros
if (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();
}Possible output:
C++11 CORE (20/20) __cpp_alias_templates 2007-04 = 2007-04 __cpp_attributes 2008-09 = 2008-09 __cpp_constexpr 2021-10 > 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 2021-10 > 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 ... C++17 CORE (20/20) __cpp_aggregate_bases 2016-03 = 2016-03 __cpp_aligned_new 2016-06 = 2016-06 __cpp_capture_star_this 2016-03 = 2016-03 __cpp_constexpr 2021-10 > 2016-03 ... truncated ... C++17 LIB (49/49) __cpp_lib_addressof_constexpr 2016-03 = 2016-03 __cpp_lib_allocator_traits_is_always_equal 2014-11 = 2014-11 ... truncated ... C++20 CORE (17/18) __cpp_aggregate_paren_init 2019-02 = 2019-02 __cpp_char8_t 2018-11 = 2018-11 __cpp_concepts 2020-02 = 2020-02 ... truncated ... C++20 LIB (64/67) __cpp_lib_array_constexpr 2018-11 = 2018-11 __cpp_lib_assume_aligned 2018-11 = 2018-11 __cpp_lib_atomic_flag_test 2019-07 = 2019-07 ... truncated ... C++23 CORE (2/11) __cpp_char8_t 2018-11 < 2022-07 __cpp_consteval 2018-11 < 2022-11 ... truncated ... C++23 LIB (16/64) __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++23 (55/65) __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++23 (135/185) __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 (8/10) assume ------- < 2022-07 carries_dependency ------- < 2008-09 deprecated 2013-09 = 2013-09 fallthrough 2016-03 = 2016-03 ... truncated ... Compiler specific macros: __cplusplus 202100L __GNUG__ 12 __GNUC_MINOR__ 2 __GNUC_PATCHLEVEL__ 1
| Library feature-test macros (C++20) | defined in the header <version> |
| C++ documentation for Macro Symbol Index | |
| 1. | The official document on Feature-Test Recommendations |
| 2. | Source code to dump compiler features |
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