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| − | {{title|Library feature-test macros {{mark c++20}}}} | + | {{title|Library feature-test macros {{mark since c++20}}}} |
| | {{cpp/utility/navbar}} | | {{cpp/utility/navbar}} |
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| | Each of following macros is defined if the header {{header|version}} or one of the corresponding headers specified in the table is included. | | Each of following macros is defined if the header {{header|version}} or one of the corresponding headers specified in the table is included. |
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| − | {| class="wikitable sortable" | + | {{include editlink|cpp/utility/feature test}} |
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| − | ! Macro name
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| − | | {{tt|__cpp_lib_addressof_constexpr}}
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| − | | {{tt|__cpp_lib_allocator_traits_is_always_equal}}
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| − | | {{header|memory}} {{header|scoped_allocator}} {{header|string}} {{header|deque}} {{header|forward_list}} {{header|list}} {{header|vector}} {{header|map}} {{header|set}} {{header|unordered_map}} {{header|unordered_set}}
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| − | | {{tt|__cpp_lib_apply}}
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| − | | {{header|tuple}}
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| − | | {{tt|__cpp_lib_array_constexpr}}
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| − | | {{header|iterator}} {{header|array}}
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| − | | {{tt|__cpp_lib_as_const}}
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| − | | {{tt|__cpp_lib_assume_aligned}}
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| − | | {{tt|__cpp_lib_atomic_flag_test}}
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| − | | {{header|atomic}}
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| − | | {{tt|__cpp_lib_atomic_float}}
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| − | | {{header|atomic}}
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| − | | {{tt|__cpp_lib_atomic_is_always_lock_free}}
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| − | | {{header|atomic}}
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| − | | {{tt|__cpp_lib_atomic_lock_free_type_aliases}}
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| − | | {{tt|__cpp_lib_atomic_ref}}
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| − | | {{tt|__cpp_lib_atomic_value_initialization}}
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| − | | {{tt|__cpp_lib_bit_cast}}
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| − | | {{tt|__cpp_lib_bitops}}
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| − | | {{header|atomic}} {{header|filesystem}} {{header|istream}} {{header|limits}} {{header|locale}} {{header|ostream}} {{header|string}} {{header|string_view}}
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| − | | {{tt|__cpp_lib_chrono}}
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| − | | {{tt|__cpp_lib_chrono_udls}}
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| − | | {{tt|__cpp_lib_constexpr_dynamic_alloc}}
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| − | | {{tt|__cpp_lib_constexpr_functional}}
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| − | | {{tt|__cpp_lib_constexpr_numeric}}
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| − | | {{tt|__cpp_lib_constexpr_utility}}
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| − | | {{tt|__cpp_lib_enable_shared_from_this}}
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| − | | {{header|string}} {{header|deque}} {{header|forward_list}} {{header|list}} {{header|vector}} {{header|map}} {{header|set}} {{header|unordered_map}} {{header|unordered_set}}
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| − | | {{tt|__cpp_lib_exchange_function}}
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| − | | {{tt|__cpp_lib_gcd_lcm}}
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| − | | {{header|numeric}}
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| − | | {{tt|__cpp_lib_generic_associative_lookup}}
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| − | | {{header|map}} {{header|set}}
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| − | | {{tt|__cpp_lib_generic_unordered_lookup}}
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| − | | {{header|unordered_map}} {{header|unordered_set}}
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| − | | {{tt|__cpp_lib_hardware_interference_size}}
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| − | | {{tt|__cpp_lib_has_unique_object_representations}}
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| − | | {{tt|__cpp_lib_hypot}}
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| − | | {{header|cmath}}
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| − | | {{tt|__cpp_lib_incomplete_container_elements}}
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| − | | {{header|forward_list}} {{header|list}} {{header|vector}}
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| − | | {{tt|__cpp_lib_int_pow2}}
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| − | | {{header|bit}}
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| − | | {{tt|__cpp_lib_integer_sequence}}
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| − | | {{header|stop_token}} {{header|thread}}
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| − | | {{tt|__cpp_lib_latch}}
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| − | | {{tt|__cpp_lib_list_remove_return_type}}
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| − | | {{header|shared_mutex}}
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| − | | {{tt|__cpp_lib_shared_ptr_arrays}}
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| − | | {{header|memory}}
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| − | | {{tt|__cpp_lib_shared_ptr_weak_type}}
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| − | | 201606L
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| − | | {{header|memory}}
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| − | | {{tt|__cpp_lib_shared_timed_mutex}}
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| − | | {{header|shared_mutex}}
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| − | | {{tt|__cpp_lib_shift}}
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| − | | {{header|algorithm}}
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| − | | {{tt|__cpp_lib_smart_ptr_for_overwrite}}
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| − | | 201811L
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| − | | {{header|memory}}
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| − | | {{tt|__cpp_lib_source_location}}
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| − | | {{header|source_location}}
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| − | | {{tt|__cpp_lib_span}}
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| − | | 202002L
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| − | | {{header|span}}
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| − | | {{tt|__cpp_lib_ssize}}
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| − | | {{header|iterator}}
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| − | | {{tt|__cpp_lib_starts_ends_with}}
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| − | | 201510L
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| − | |-
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| − | | 201411L
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| − | | {{header|type_traits}}
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| − | |}
| + | |
| | | | |
| − | {{langlinks|es|ja|zh}} | + | {{cpp/utility/feature test}} |
| | + | |
| | + | ===Notes=== |
| | + | Each value in "Value" column follows the pattern: {{c/core|"yyyymmL"}}, where {{c/core|"yyyy"}} is a year, and {{c/core|"mm"}} is a month when the corresponding feature-set was accepted for standardization. Some values where increased since the time of their introduction, if capabilities of given feature where extended. The table above contains only the most recent values (that is, taken from the latest C++ language draft standard). A full set of values, including the initial and intermediate ones, can be found in [[cpp/feature test#Library features|this table]]. |
| | + | |
| | + | ===See also=== |
| | + | {{dsc begin}} |
| | + | {{dsc|[[cpp/feature_test|'''Feature testing''']] {{mark c++20}}|A set of preprocessor macros to test the corresponding to C++ language and library features}} |
| | + | {{dsc see cpp|cpp/freestanding#Requirements on standard library headers|Headers required for a freestanding implementation|nomono=true}} |
| | + | {{dsc see cpp|cpp/preprocessor/replace#Predefined macros|Predefined Macro Symbols|nomono=true}} |
| | + | {{dsc end}} |
| | + | |
| | + | {{langlinks|es|ja|ru|zh}} |
