[version.syn]

# 17 Language support library [[support]](./#support)

## 17.3 Implementation properties [[support.limits]](support.limits#version.syn)

### 17.3.2 Header <version> synopsis [version.syn]

[1](#1)

[#](http://github.com/Eelis/draft/tree/9adde4bc1c62ec234483e63ea3b70a59724c745a/source/support.tex#L539)

The header <version> supplies implementation-dependent information
about the C++ standard library
(e.g., version number and release date)[.](#1.sentence-1)

[2](#2)

[#](http://github.com/Eelis/draft/tree/9adde4bc1c62ec234483e63ea3b70a59724c745a/source/support.tex#L545)

Each of the macros defined in [<version>](#header:%3cversion%3e "17.3.2 Header <version> synopsis [version.syn]") is also defined
after inclusion of any member of the set of library headers
indicated in the corresponding comment in this synopsis[.](#2.sentence-1)

[*Note [1](#note-1)*:

Future revisions of this document might replace
the values of these macros with greater values[.](#2.sentence-2)

— *end note*]

#define __cpp_lib_adaptor_iterator_pair_constructor 202106L // also in [<stack>](stack.syn#header:%3cstack%3e "23.6.5 Header <stack> synopsis [stack.syn]"), [<queue>](queue.syn#header:%3cqueue%3e "23.6.2 Header <queue> synopsis [queue.syn]")#define __cpp_lib_addressof_constexpr 201603L // freestanding, also in [<memory>](memory.syn#header:%3cmemory%3e "20.2.2 Header <memory> synopsis [memory.syn]")#define __cpp_lib_algorithm_default_value_type 202403L// also in [<algorithm>](algorithm.syn#header:%3calgorithm%3e "26.4 Header <algorithm> synopsis [algorithm.syn]"), [<ranges>](ranges.syn#header:%3cranges%3e "25.2 Header <ranges> synopsis [ranges.syn]"), [<string>](string.syn#header:%3cstring%3e "27.4.2 Header <string> synopsis [string.syn]"), [<deque>](deque.syn#header:%3cdeque%3e "23.3.4 Header <deque> synopsis [deque.syn]"), [<list>](list.syn#header:%3clist%3e "23.3.10 Header <list> synopsis [list.syn]"), [<forward_list>](forward.list.syn#header:%3cforward_list%3e "23.3.6 Header <forward_­list> synopsis [forward.list.syn]"), [<vector>](vector.syn#header:%3cvector%3e "23.3.12 Header <vector> synopsis [vector.syn]")#define __cpp_lib_algorithm_iterator_requirements 202207L// also in [<algorithm>](algorithm.syn#header:%3calgorithm%3e "26.4 Header <algorithm> synopsis [algorithm.syn]"), [<numeric>](numeric.ops.overview#header:%3cnumeric%3e "26.9 Header <numeric> synopsis [numeric.ops.overview]"), [<memory>](memory.syn#header:%3cmemory%3e "20.2.2 Header <memory> synopsis [memory.syn]")#define __cpp_lib_aligned_accessor 202411L // also in [<mdspan>](mdspan.syn#header:%3cmdspan%3e "23.7.3.2 Header <mdspan> synopsis [mdspan.syn]")#define __cpp_lib_allocate_at_least 202302L // also in [<memory>](memory.syn#header:%3cmemory%3e "20.2.2 Header <memory> synopsis [memory.syn]")#define __cpp_lib_allocator_traits_is_always_equal 201411L// freestanding, also in [<memory>](memory.syn#header:%3cmemory%3e "20.2.2 Header <memory> synopsis [memory.syn]"), [<scoped_allocator>](allocator.adaptor.syn#header:%3cscoped_allocator%3e "20.6.1 Header <scoped_­allocator> synopsis [allocator.adaptor.syn]"), [<string>](string.syn#header:%3cstring%3e "27.4.2 Header <string> synopsis [string.syn]"), [<deque>](deque.syn#header:%3cdeque%3e "23.3.4 Header <deque> synopsis [deque.syn]"), [<forward_list>](forward.list.syn#header:%3cforward_list%3e "23.3.6 Header <forward_­list> synopsis [forward.list.syn]"), [<list>](list.syn#header:%3clist%3e "23.3.10 Header <list> synopsis [list.syn]"),// [<vector>](vector.syn#header:%3cvector%3e "23.3.12 Header <vector> synopsis [vector.syn]"), [<map>](associative.map.syn#header:%3cmap%3e "23.4.2 Header <map> synopsis [associative.map.syn]"), [<set>](associative.set.syn#header:%3cset%3e "23.4.5 Header <set> synopsis [associative.set.syn]"), [<unordered_map>](unord.map.syn#header:%3cunordered_map%3e "23.5.2 Header <unordered_­map> synopsis [unord.map.syn]"), [<unordered_set>](unord.set.syn#header:%3cunordered_set%3e "23.5.5 Header <unordered_­set> synopsis [unord.set.syn]")#define __cpp_lib_any 201606L // also in [<any>](any.synop#header:%3cany%3e "22.7.2 Header <any> synopsis [any.synop]")#define __cpp_lib_apply 202506L // freestanding, also in [<tuple>](tuple.syn#header:%3ctuple%3e "22.4.2 Header <tuple> synopsis [tuple.syn]"), [<type_traits>](meta.type.synop#header:%3ctype_traits%3e "21.3.3 Header <type_­traits> synopsis [meta.type.synop]")#define __cpp_lib_array_constexpr 201811L // also in [<iterator>](iterator.synopsis#header:%3citerator%3e "24.2 Header <iterator>&nbsp;synopsis [iterator.synopsis]"), [<array>](array.syn#header:%3carray%3e "23.3.2 Header <array> synopsis [array.syn]")#define __cpp_lib_as_const 201510L // freestanding, also in [<utility>](utility.syn#header:%3cutility%3e "22.2.1 Header <utility> synopsis [utility.syn]")#define __cpp_lib_associative_heterogeneous_erasure 202110L// also in [<map>](associative.map.syn#header:%3cmap%3e "23.4.2 Header <map> synopsis [associative.map.syn]"), [<set>](associative.set.syn#header:%3cset%3e "23.4.5 Header <set> synopsis [associative.set.syn]"), [<unordered_map>](unord.map.syn#header:%3cunordered_map%3e "23.5.2 Header <unordered_­map> synopsis [unord.map.syn]"), [<unordered_set>](unord.set.syn#header:%3cunordered_set%3e "23.5.5 Header <unordered_­set> synopsis [unord.set.syn]")#define __cpp_lib_associative_heterogeneous_insertion 202306L// also in [<map>](associative.map.syn#header:%3cmap%3e "23.4.2 Header <map> synopsis [associative.map.syn]"), [<set>](associative.set.syn#header:%3cset%3e "23.4.5 Header <set> synopsis [associative.set.syn]"), [<unordered_map>](unord.map.syn#header:%3cunordered_map%3e "23.5.2 Header <unordered_­map> synopsis [unord.map.syn]"), [<unordered_set>](unord.set.syn#header:%3cunordered_set%3e "23.5.5 Header <unordered_­set> synopsis [unord.set.syn]")#define __cpp_lib_assume_aligned 201811L // freestanding, also in [<memory>](memory.syn#header:%3cmemory%3e "20.2.2 Header <memory> synopsis [memory.syn]")#define __cpp_lib_atomic_flag_test 201907L // freestanding, also in [<atomic>](atomics.syn#header:%3catomic%3e "32.5.2 Header <atomic> synopsis [atomics.syn]")#define __cpp_lib_atomic_float 201711L // freestanding, also in [<atomic>](atomics.syn#header:%3catomic%3e "32.5.2 Header <atomic> synopsis [atomics.syn]")#define __cpp_lib_atomic_is_always_lock_free 201603L // freestanding, also in [<atomic>](atomics.syn#header:%3catomic%3e "32.5.2 Header <atomic> synopsis [atomics.syn]")#define __cpp_lib_atomic_lock_free_type_aliases 201907L // also in [<atomic>](atomics.syn#header:%3catomic%3e "32.5.2 Header <atomic> synopsis [atomics.syn]")#define __cpp_lib_atomic_min_max 202506L // freestanding, also in [<atomic>](atomics.syn#header:%3catomic%3e "32.5.2 Header <atomic> synopsis [atomics.syn]")#define __cpp_lib_atomic_reductions 202506L // freestanding, also in [<atomic>](atomics.syn#header:%3catomic%3e "32.5.2 Header <atomic> synopsis [atomics.syn]")#define __cpp_lib_atomic_ref 202411L // freestanding, also in [<atomic>](atomics.syn#header:%3catomic%3e "32.5.2 Header <atomic> synopsis [atomics.syn]")#define __cpp_lib_atomic_shared_ptr 201711L // also in [<memory>](memory.syn#header:%3cmemory%3e "20.2.2 Header <memory> synopsis [memory.syn]")#define __cpp_lib_atomic_value_initialization 201911L // freestanding, also in [<atomic>](atomics.syn#header:%3catomic%3e "32.5.2 Header <atomic> synopsis [atomics.syn]"), [<memory>](memory.syn#header:%3cmemory%3e "20.2.2 Header <memory> synopsis [memory.syn]")#define __cpp_lib_atomic_wait 201907L // freestanding, also in [<atomic>](atomics.syn#header:%3catomic%3e "32.5.2 Header <atomic> synopsis [atomics.syn]")#define __cpp_lib_barrier 202302L // also in [<barrier>](barrier.syn#header:%3cbarrier%3e "32.9.3.2 Header <barrier> synopsis [barrier.syn]")#define __cpp_lib_bind_back 202306L // freestanding, also in [<functional>](functional.syn#header:%3cfunctional%3e "22.10.2 Header <functional> synopsis [functional.syn]")#define __cpp_lib_bind_front 202306L // freestanding, also in [<functional>](functional.syn#header:%3cfunctional%3e "22.10.2 Header <functional> synopsis [functional.syn]")#define __cpp_lib_bit_cast 201806L // freestanding, also in [<bit>](bit.general#header:%3cbit%3e "22.11.1 General [bit.general]")#define __cpp_lib_bitops 201907L // freestanding, also in [<bit>](bit.general#header:%3cbit%3e "22.11.1 General [bit.general]")#define __cpp_lib_bitset 202306L // also in [<bitset>](bitset.syn#header:%3cbitset%3e "22.9.1 Header <bitset> synopsis [bitset.syn]")#define __cpp_lib_bool_constant 201505L // freestanding, also in [<type_traits>](meta.type.synop#header:%3ctype_traits%3e "21.3.3 Header <type_­traits> synopsis [meta.type.synop]")#define __cpp_lib_bounded_array_traits 201902L // freestanding, also in [<type_traits>](meta.type.synop#header:%3ctype_traits%3e "21.3.3 Header <type_­traits> synopsis [meta.type.synop]")#define __cpp_lib_boyer_moore_searcher 201603L // also in [<functional>](functional.syn#header:%3cfunctional%3e "22.10.2 Header <functional> synopsis [functional.syn]")#define __cpp_lib_byte 201603L // freestanding, also in [<cstddef>](cstddef.syn#header:%3ccstddef%3e "17.2.1 Header <cstddef> synopsis [cstddef.syn]")#define __cpp_lib_byteswap 202110L // freestanding, also in [<bit>](bit.general#header:%3cbit%3e "22.11.1 General [bit.general]")#define __cpp_lib_char8_t 201907L// freestanding, also in [<atomic>](atomics.syn#header:%3catomic%3e "32.5.2 Header <atomic> synopsis [atomics.syn]"), [<filesystem>](fs.filesystem.syn#header:%3cfilesystem%3e "31.12.4 Header <filesystem> synopsis [fs.filesystem.syn]"), [<istream>](istream.syn#header:%3cistream%3e "31.7.1 Header <istream> synopsis [istream.syn]"), [<limits>](limits.syn#header:%3climits%3e "17.3.3 Header <limits> synopsis [limits.syn]"), [<locale>](locale.syn#header:%3clocale%3e "28.3.2 Header <locale> synopsis [locale.syn]"), [<ostream>](ostream.syn#header:%3costream%3e "31.7.2 Header <ostream> synopsis [ostream.syn]"), [<string>](string.syn#header:%3cstring%3e "27.4.2 Header <string> synopsis [string.syn]"),// [<string_view>](string.view.synop#header:%3cstring_view%3e "27.3.2 Header <string_­view> synopsis [string.view.synop]")#define __cpp_lib_chrono 202306L // also in [<chrono>](time.syn#header:%3cchrono%3e "30.2 Header <chrono> synopsis [time.syn]")#define __cpp_lib_chrono_udls 201304L // also in [<chrono>](time.syn#header:%3cchrono%3e "30.2 Header <chrono> synopsis [time.syn]")#define __cpp_lib_clamp 201603L // also in [<algorithm>](algorithm.syn#header:%3calgorithm%3e "26.4 Header <algorithm> synopsis [algorithm.syn]")#define __cpp_lib_common_reference 202302L // freestanding, also in [<type_traits>](meta.type.synop#header:%3ctype_traits%3e "21.3.3 Header <type_­traits> synopsis [meta.type.synop]")#define __cpp_lib_common_reference_wrapper 202302L // freestanding, also in [<functional>](functional.syn#header:%3cfunctional%3e "22.10.2 Header <functional> synopsis [functional.syn]")#define __cpp_lib_complex_udls 201309L // also in [<complex>](complex.syn#header:%3ccomplex%3e "29.4.2 Header <complex> synopsis [complex.syn]")#define __cpp_lib_concepts 202207L// freestanding, also in [<concepts>](concepts.syn#header:%3cconcepts%3e "18.3 Header <concepts> synopsis [concepts.syn]"), [<compare>](compare.syn#header:%3ccompare%3e "17.12.1 Header <compare> synopsis [compare.syn]")#define __cpp_lib_constant_wrapper 202506L // freestanding, also in [<type_traits>](meta.type.synop#header:%3ctype_traits%3e "21.3.3 Header <type_­traits> synopsis [meta.type.synop]")#define __cpp_lib_constexpr_algorithms 202306L // also in [<algorithm>](algorithm.syn#header:%3calgorithm%3e "26.4 Header <algorithm> synopsis [algorithm.syn]"), [<utility>](utility.syn#header:%3cutility%3e "22.2.1 Header <utility> synopsis [utility.syn]")#define __cpp_lib_constexpr_atomic 202411L // also in [<atomic>](atomics.syn#header:%3catomic%3e "32.5.2 Header <atomic> synopsis [atomics.syn]")#define __cpp_lib_constexpr_bitset 202207L // also in [<bitset>](bitset.syn#header:%3cbitset%3e "22.9.1 Header <bitset> synopsis [bitset.syn]")#define __cpp_lib_constexpr_charconv 202207L // freestanding, also in [<charconv>](charconv.syn#header:%3ccharconv%3e "28.2.1 Header <charconv> synopsis [charconv.syn]")#define __cpp_lib_constexpr_cmath 202306L // also in [<cmath>](cmath.syn#header:%3ccmath%3e "29.7.1 Header <cmath> synopsis [cmath.syn]"), [<cstdlib>](cstdlib.syn#header:%3ccstdlib%3e "17.2.2 Header <cstdlib> synopsis [cstdlib.syn]")#define __cpp_lib_constexpr_complex 202306L // also in [<complex>](complex.syn#header:%3ccomplex%3e "29.4.2 Header <complex> synopsis [complex.syn]")#define __cpp_lib_constexpr_deque 202502L // also in [<deque>](deque.syn#header:%3cdeque%3e "23.3.4 Header <deque> synopsis [deque.syn]")#define __cpp_lib_constexpr_dynamic_alloc 201907L // also in [<memory>](memory.syn#header:%3cmemory%3e "20.2.2 Header <memory> synopsis [memory.syn]")#define __cpp_lib_constexpr_exceptions 202502L// also in [<exception>](support.exception.general#header:%3cexception%3e "17.9.1 General [support.exception.general]"), [<stdexcept>](std.exceptions.general#header:%3cstdexcept%3e "19.2.1 General [std.exceptions.general]"), [<expected>](expected.syn#header:%3cexpected%3e "22.8.2 Header <expected> synopsis [expected.syn]"), [<optional>](optional.syn#header:%3coptional%3e "22.5.2 Header <optional> synopsis [optional.syn]"), [<variant>](variant.syn#header:%3cvariant%3e "22.6.2 Header <variant> synopsis [variant.syn]"), and [<format>](format.formatter.spec#header:%3cformat%3e "28.5.6.4 Formatter specializations [format.formatter.spec]")#define __cpp_lib_constexpr_flat_map 202502L // also in [<flat_map>](flat.map.syn#header:%3cflat_map%3e "23.6.7 Header <flat_­map> synopsis [flat.map.syn]")#define __cpp_lib_constexpr_flat_set 202502L // also in [<flat_set>](flat.set.syn#header:%3cflat_set%3e "23.6.10 Header <flat_­set> synopsis [flat.set.syn]")#define __cpp_lib_constexpr_forward_list 202502L // also in [<forward_list>](forward.list.syn#header:%3cforward_list%3e "23.3.6 Header <forward_­list> synopsis [forward.list.syn]")#define __cpp_lib_constexpr_functional 201907L // freestanding, also in [<functional>](functional.syn#header:%3cfunctional%3e "22.10.2 Header <functional> synopsis [functional.syn]")#define __cpp_lib_constexpr_inplace_vector 202502L // also in [<inplace_vector>](inplace.vector.syn#header:%3cinplace_vector%3e "23.3.15 Header <inplace_­vector> synopsis [inplace.vector.syn]")#define __cpp_lib_constexpr_iterator 201811L // freestanding, also in [<iterator>](iterator.synopsis#header:%3citerator%3e "24.2 Header <iterator>&nbsp;synopsis [iterator.synopsis]")#define __cpp_lib_constexpr_list 202502L // also in [<list>](list.syn#header:%3clist%3e "23.3.10 Header <list> synopsis [list.syn]")#define __cpp_lib_constexpr_map 202502L // also in [<map>](associative.map.syn#header:%3cmap%3e "23.4.2 Header <map> synopsis [associative.map.syn]")#define __cpp_lib_constexpr_memory 202506L // freestanding, also in [<memory>](memory.syn#header:%3cmemory%3e "20.2.2 Header <memory> synopsis [memory.syn]")#define __cpp_lib_constexpr_new 202406L // freestanding, also in [<new>](support.dynamic.general#header:%3cnew%3e "17.6.1 General [support.dynamic.general]")#define __cpp_lib_constexpr_numeric 201911L // also in [<numeric>](numeric.ops.overview#header:%3cnumeric%3e "26.9 Header <numeric> synopsis [numeric.ops.overview]")#define __cpp_lib_constexpr_queue 202502L // also in [<queue>](queue.syn#header:%3cqueue%3e "23.6.2 Header <queue> synopsis [queue.syn]")#define __cpp_lib_constexpr_set 202502L // also in [<set>](associative.set.syn#header:%3cset%3e "23.4.5 Header <set> synopsis [associative.set.syn]")#define __cpp_lib_constexpr_stack 202502L // also in [<stack>](stack.syn#header:%3cstack%3e "23.6.5 Header <stack> synopsis [stack.syn]")#define __cpp_lib_constexpr_string 201907L // also in [<string>](string.syn#header:%3cstring%3e "27.4.2 Header <string> synopsis [string.syn]")#define __cpp_lib_constexpr_string_view 201811L // also in [<string_view>](string.view.synop#header:%3cstring_view%3e "27.3.2 Header <string_­view> synopsis [string.view.synop]")#define __cpp_lib_constexpr_tuple 201811L // freestanding, also in [<tuple>](tuple.syn#header:%3ctuple%3e "22.4.2 Header <tuple> synopsis [tuple.syn]")#define __cpp_lib_constexpr_typeinfo 202106L // freestanding, also in [<typeinfo>](typeinfo.syn#header:%3ctypeinfo%3e "17.7.2 Header <typeinfo> synopsis [typeinfo.syn]")#define __cpp_lib_constexpr_unordered_map 202502L // also in [<unordered_map>](unord.map.syn#header:%3cunordered_map%3e "23.5.2 Header <unordered_­map> synopsis [unord.map.syn]")#define __cpp_lib_constexpr_unordered_set 202502L // also in [<unordered_set>](unord.set.syn#header:%3cunordered_set%3e "23.5.5 Header <unordered_­set> synopsis [unord.set.syn]")#define __cpp_lib_constexpr_utility 201811L // freestanding, also in [<utility>](utility.syn#header:%3cutility%3e "22.2.1 Header <utility> synopsis [utility.syn]")#define __cpp_lib_constexpr_vector 201907L // also in [<vector>](vector.syn#header:%3cvector%3e "23.3.12 Header <vector> synopsis [vector.syn]")#define __cpp_lib_constrained_equality 202411L // freestanding,// also in [<utility>](utility.syn#header:%3cutility%3e "22.2.1 Header <utility> synopsis [utility.syn]"), [<tuple>](tuple.syn#header:%3ctuple%3e "22.4.2 Header <tuple> synopsis [tuple.syn]"), [<optional>](optional.syn#header:%3coptional%3e "22.5.2 Header <optional> synopsis [optional.syn]"), [<variant>](variant.syn#header:%3cvariant%3e "22.6.2 Header <variant> synopsis [variant.syn]"), [<expected>](expected.syn#header:%3cexpected%3e "22.8.2 Header <expected> synopsis [expected.syn]")#define __cpp_lib_containers_ranges 202202L// also in [<vector>](vector.syn#header:%3cvector%3e "23.3.12 Header <vector> synopsis [vector.syn]"), [<list>](list.syn#header:%3clist%3e "23.3.10 Header <list> synopsis [list.syn]"), [<forward_list>](forward.list.syn#header:%3cforward_list%3e "23.3.6 Header <forward_­list> synopsis [forward.list.syn]"), [<map>](associative.map.syn#header:%3cmap%3e "23.4.2 Header <map> synopsis [associative.map.syn]"), [<set>](associative.set.syn#header:%3cset%3e "23.4.5 Header <set> synopsis [associative.set.syn]"), [<unordered_map>](unord.map.syn#header:%3cunordered_map%3e "23.5.2 Header <unordered_­map> synopsis [unord.map.syn]"), [<unordered_set>](unord.set.syn#header:%3cunordered_set%3e "23.5.5 Header <unordered_­set> synopsis [unord.set.syn]"),// [<deque>](deque.syn#header:%3cdeque%3e "23.3.4 Header <deque> synopsis [deque.syn]"), [<queue>](queue.syn#header:%3cqueue%3e "23.6.2 Header <queue> synopsis [queue.syn]"), [<stack>](stack.syn#header:%3cstack%3e "23.6.5 Header <stack> synopsis [stack.syn]"), [<string>](string.syn#header:%3cstring%3e "27.4.2 Header <string> synopsis [string.syn]")#define __cpp_lib_contracts 202502L // freestanding, also in [<contracts>](contracts.syn#header:%3ccontracts%3e "17.10.1 Header <contracts> synopsis [contracts.syn]")#define __cpp_lib_copyable_function 202306L // also in [<functional>](functional.syn#header:%3cfunctional%3e "22.10.2 Header <functional> synopsis [functional.syn]")#define __cpp_lib_coroutine 201902L // freestanding, also in [<coroutine>](coroutine.syn#header:%3ccoroutine%3e "17.13.2 Header <coroutine> synopsis [coroutine.syn]")#define __cpp_lib_counting_scope 202506L // also in [<execution>](execution.syn#header:%3cexecution%3e "33.4 Header <execution> synopsis [execution.syn]")#define __cpp_lib_debugging 202403L // freestanding, also in [<debugging>](debugging.syn#header:%3cdebugging%3e "19.7.2 Header <debugging> synopsis [debugging.syn]")#define __cpp_lib_define_static 202506L // freestanding, also in [<meta>](meta.syn#header:%3cmeta%3e "21.4.1 Header <meta> synopsis [meta.syn]")#define __cpp_lib_destroying_delete 201806L // freestanding, also in [<new>](support.dynamic.general#header:%3cnew%3e "17.6.1 General [support.dynamic.general]")#define __cpp_lib_enable_shared_from_this 201603L // also in [<memory>](memory.syn#header:%3cmemory%3e "20.2.2 Header <memory> synopsis [memory.syn]")#define __cpp_lib_endian 201907L // freestanding, also in [<bit>](bit.general#header:%3cbit%3e "22.11.1 General [bit.general]")#define __cpp_lib_erase_if 202002L// also in [<string>](string.syn#header:%3cstring%3e "27.4.2 Header <string> synopsis [string.syn]"), [<deque>](deque.syn#header:%3cdeque%3e "23.3.4 Header <deque> synopsis [deque.syn]"), [<forward_list>](forward.list.syn#header:%3cforward_list%3e "23.3.6 Header <forward_­list> synopsis [forward.list.syn]"), [<list>](list.syn#header:%3clist%3e "23.3.10 Header <list> synopsis [list.syn]"), [<vector>](vector.syn#header:%3cvector%3e "23.3.12 Header <vector> synopsis [vector.syn]"), [<map>](associative.map.syn#header:%3cmap%3e "23.4.2 Header <map> synopsis [associative.map.syn]"), [<set>](associative.set.syn#header:%3cset%3e "23.4.5 Header <set> synopsis [associative.set.syn]"), [<unordered_map>](unord.map.syn#header:%3cunordered_map%3e "23.5.2 Header <unordered_­map> synopsis [unord.map.syn]"),// [<unordered_set>](unord.set.syn#header:%3cunordered_set%3e "23.5.5 Header <unordered_­set> synopsis [unord.set.syn]")#define __cpp_lib_exception_ptr_cast 202506L // also in [<exception>](support.exception.general#header:%3cexception%3e "17.9.1 General [support.exception.general]")#define __cpp_lib_exchange_function 201304L // freestanding, also in [<utility>](utility.syn#header:%3cutility%3e "22.2.1 Header <utility> synopsis [utility.syn]")#define __cpp_lib_execution 201902L // also in [<execution>](execution.syn#header:%3cexecution%3e "33.4 Header <execution> synopsis [execution.syn]")#define __cpp_lib_expected 202211L // also in [<expected>](expected.syn#header:%3cexpected%3e "22.8.2 Header <expected> synopsis [expected.syn]")#define __cpp_lib_filesystem 201703L // also in [<filesystem>](fs.filesystem.syn#header:%3cfilesystem%3e "31.12.4 Header <filesystem> synopsis [fs.filesystem.syn]")#define __cpp_lib_flat_map 202207L // also in [<flat_map>](flat.map.syn#header:%3cflat_map%3e "23.6.7 Header <flat_­map> synopsis [flat.map.syn]")#define __cpp_lib_flat_set 202207L // also in [<flat_set>](flat.set.syn#header:%3cflat_set%3e "23.6.10 Header <flat_­set> synopsis [flat.set.syn]")#define __cpp_lib_format 202311L // also in [<format>](format.formatter.spec#header:%3cformat%3e "28.5.6.4 Formatter specializations [format.formatter.spec]")#define __cpp_lib_format_ranges 202207L // also in [<format>](format.formatter.spec#header:%3cformat%3e "28.5.6.4 Formatter specializations [format.formatter.spec]")#define __cpp_lib_format_path 202506L // also in [<filesystem>](fs.filesystem.syn#header:%3cfilesystem%3e "31.12.4 Header <filesystem> synopsis [fs.filesystem.syn]")#define __cpp_lib_format_uchar 202311L // also in [<format>](format.formatter.spec#header:%3cformat%3e "28.5.6.4 Formatter specializations [format.formatter.spec]")#define __cpp_lib_formatters 202302L // also in [<stacktrace>](stacktrace.syn#header:%3cstacktrace%3e "19.6.2 Header <stacktrace> synopsis [stacktrace.syn]"), [<thread>](thread.syn#header:%3cthread%3e "32.4.2 Header <thread> synopsis [thread.syn]")#define __cpp_lib_forward_like 202207L // freestanding, also in [<utility>](utility.syn#header:%3cutility%3e "22.2.1 Header <utility> synopsis [utility.syn]")#define __cpp_lib_freestanding_algorithm 202502L // freestanding, also in [<algorithm>](algorithm.syn#header:%3calgorithm%3e "26.4 Header <algorithm> synopsis [algorithm.syn]")#define __cpp_lib_freestanding_array 202311L // freestanding, also in [<array>](array.syn#header:%3carray%3e "23.3.2 Header <array> synopsis [array.syn]")#define __cpp_lib_freestanding_char_traits 202306L // freestanding, also in [<string>](string.syn#header:%3cstring%3e "27.4.2 Header <string> synopsis [string.syn]")#define __cpp_lib_freestanding_charconv 202306L // freestanding, also in [<charconv>](charconv.syn#header:%3ccharconv%3e "28.2.1 Header <charconv> synopsis [charconv.syn]")#define __cpp_lib_freestanding_cstdlib 202306L // freestanding, also in [<cstdlib>](cstdlib.syn#header:%3ccstdlib%3e "17.2.2 Header <cstdlib> synopsis [cstdlib.syn]"), [<cmath>](cmath.syn#header:%3ccmath%3e "29.7.1 Header <cmath> synopsis [cmath.syn]")#define __cpp_lib_freestanding_cstring 202311L // freestanding, also in [<cstring>](cstring.syn#header:%3ccstring%3e "27.5.1 Header <cstring> synopsis [cstring.syn]")#define __cpp_lib_freestanding_cwchar 202306L // freestanding, also in [<cwchar>](cwchar.syn#header:%3ccwchar%3e "28.7.3 Header <cwchar> synopsis [cwchar.syn]")#define __cpp_lib_freestanding_errc 202306L// freestanding, also in [<cerrno>](errno.general#header:%3ccerrno%3e "19.4.1 General [errno.general]"), [<system_error>](system.error.syn#header:%3csystem_error%3e "19.5.2 Header <system_­error> synopsis [system.error.syn]")#define __cpp_lib_freestanding_execution 202502L // freestanding, also in [<execution>](execution.syn#header:%3cexecution%3e "33.4 Header <execution> synopsis [execution.syn]")#define __cpp_lib_freestanding_expected 202311L // freestanding, also in [<expected>](expected.syn#header:%3cexpected%3e "22.8.2 Header <expected> synopsis [expected.syn]")#define __cpp_lib_freestanding_feature_test_macros 202306L // freestanding#define __cpp_lib_freestanding_functional 202306L // freestanding, also in [<functional>](functional.syn#header:%3cfunctional%3e "22.10.2 Header <functional> synopsis [functional.syn]")#define __cpp_lib_freestanding_iterator 202306L // freestanding, also in [<iterator>](iterator.synopsis#header:%3citerator%3e "24.2 Header <iterator>&nbsp;synopsis [iterator.synopsis]")#define __cpp_lib_freestanding_mdspan 202311L // freestanding, also in [<mdspan>](mdspan.syn#header:%3cmdspan%3e "23.7.3.2 Header <mdspan> synopsis [mdspan.syn]")#define __cpp_lib_freestanding_memory 202502L // freestanding, also in [<memory>](memory.syn#header:%3cmemory%3e "20.2.2 Header <memory> synopsis [memory.syn]")#define __cpp_lib_freestanding_numeric 202502L // freestanding, also in [<numeric>](numeric.ops.overview#header:%3cnumeric%3e "26.9 Header <numeric> synopsis [numeric.ops.overview]")#define __cpp_lib_freestanding_operator_new *see below* // freestanding, also in [<new>](support.dynamic.general#header:%3cnew%3e "17.6.1 General [support.dynamic.general]")#define __cpp_lib_freestanding_optional 202506L // freestanding, also in [<optional>](optional.syn#header:%3coptional%3e "22.5.2 Header <optional> synopsis [optional.syn]")#define __cpp_lib_freestanding_random 202502L // freestanding, also in [<random>](rand.synopsis#header:%3crandom%3e "29.5.2 Header <random> synopsis [rand.synopsis]")#define __cpp_lib_freestanding_ranges 202306L // freestanding, also in [<ranges>](ranges.syn#header:%3cranges%3e "25.2 Header <ranges> synopsis [ranges.syn]")#define __cpp_lib_freestanding_ratio 202306L // freestanding, also in [<ratio>](ratio.syn#header:%3cratio%3e "21.5.2 Header <ratio> synopsis [ratio.syn]")#define __cpp_lib_freestanding_string_view 202311L // freestanding, also in [<string_view>](string.view.synop#header:%3cstring_view%3e "27.3.2 Header <string_­view> synopsis [string.view.synop]")#define __cpp_lib_freestanding_tuple 202306L // freestanding, also in [<tuple>](tuple.syn#header:%3ctuple%3e "22.4.2 Header <tuple> synopsis [tuple.syn]")#define __cpp_lib_freestanding_utility 202306L // freestanding, also in [<utility>](utility.syn#header:%3cutility%3e "22.2.1 Header <utility> synopsis [utility.syn]")#define __cpp_lib_freestanding_variant 202311L // freestanding, also in [<variant>](variant.syn#header:%3cvariant%3e "22.6.2 Header <variant> synopsis [variant.syn]")#define __cpp_lib_fstream_native_handle 202306L // also in [<fstream>](fstream.syn#header:%3cfstream%3e "31.10.1 Header <fstream> synopsis [fstream.syn]")#define __cpp_lib_function_ref 202306L // also in [<functional>](functional.syn#header:%3cfunctional%3e "22.10.2 Header <functional> synopsis [functional.syn]")#define __cpp_lib_gcd_lcm 201606L // also in [<numeric>](numeric.ops.overview#header:%3cnumeric%3e "26.9 Header <numeric> synopsis [numeric.ops.overview]")#define __cpp_lib_generator 202207L // also in [<generator>](generator.syn#header:%3cgenerator%3e "25.8.2 Header <generator> synopsis [generator.syn]")#define __cpp_lib_generic_associative_lookup 201304L // also in [<map>](associative.map.syn#header:%3cmap%3e "23.4.2 Header <map> synopsis [associative.map.syn]"), [<set>](associative.set.syn#header:%3cset%3e "23.4.5 Header <set> synopsis [associative.set.syn]")#define __cpp_lib_generic_unordered_lookup 201811L// also in [<unordered_map>](unord.map.syn#header:%3cunordered_map%3e "23.5.2 Header <unordered_­map> synopsis [unord.map.syn]"), [<unordered_set>](unord.set.syn#header:%3cunordered_set%3e "23.5.5 Header <unordered_­set> synopsis [unord.set.syn]")#define __cpp_lib_hardware_interference_size 201703L // freestanding, also in [<new>](support.dynamic.general#header:%3cnew%3e "17.6.1 General [support.dynamic.general]")#define __cpp_lib_has_unique_object_representations 201606L // freestanding, also in [<type_traits>](meta.type.synop#header:%3ctype_traits%3e "21.3.3 Header <type_­traits> synopsis [meta.type.synop]")#define __cpp_lib_hazard_pointer 202306L // also in [<hazard_pointer>](hazard.pointer.syn#header:%3chazard_pointer%3e "32.11.3.2 Header <hazard_­pointer> synopsis [hazard.pointer.syn]")#define __cpp_lib_hive 202502L // also in [<hive>](hive.syn#header:%3chive%3e "23.3.8 Header <hive> synopsis [hive.syn]")#define __cpp_lib_hypot 201603L // also in [<cmath>](cmath.syn#header:%3ccmath%3e "29.7.1 Header <cmath> synopsis [cmath.syn]")#define __cpp_lib_incomplete_container_elements 201505L// also in [<forward_list>](forward.list.syn#header:%3cforward_list%3e "23.3.6 Header <forward_­list> synopsis [forward.list.syn]"), [<list>](list.syn#header:%3clist%3e "23.3.10 Header <list> synopsis [list.syn]"), [<vector>](vector.syn#header:%3cvector%3e "23.3.12 Header <vector> synopsis [vector.syn]")#define __cpp_lib_indirect 202502L // also in [<memory>](memory.syn#header:%3cmemory%3e "20.2.2 Header <memory> synopsis [memory.syn]")#define __cpp_lib_inplace_vector 202406L // also in [<inplace_vector>](inplace.vector.syn#header:%3cinplace_vector%3e "23.3.15 Header <inplace_­vector> synopsis [inplace.vector.syn]")#define __cpp_lib_int_pow2 202002L // freestanding, also in [<bit>](bit.general#header:%3cbit%3e "22.11.1 General [bit.general]")#define __cpp_lib_integer_comparison_functions 202002L // also in [<utility>](utility.syn#header:%3cutility%3e "22.2.1 Header <utility> synopsis [utility.syn]")#define __cpp_lib_integer_sequence 201304L // freestanding, also in [<utility>](utility.syn#header:%3cutility%3e "22.2.1 Header <utility> synopsis [utility.syn]")#define __cpp_lib_integral_constant_callable 201304L // freestanding, also in [<type_traits>](meta.type.synop#header:%3ctype_traits%3e "21.3.3 Header <type_­traits> synopsis [meta.type.synop]")#define __cpp_lib_interpolate 201902L // also in [<cmath>](cmath.syn#header:%3ccmath%3e "29.7.1 Header <cmath> synopsis [cmath.syn]"), [<numeric>](numeric.ops.overview#header:%3cnumeric%3e "26.9 Header <numeric> synopsis [numeric.ops.overview]")#define __cpp_lib_invoke 201411L // freestanding, also in [<functional>](functional.syn#header:%3cfunctional%3e "22.10.2 Header <functional> synopsis [functional.syn]")#define __cpp_lib_invoke_r 202106L // freestanding, also in [<functional>](functional.syn#header:%3cfunctional%3e "22.10.2 Header <functional> synopsis [functional.syn]")#define __cpp_lib_ios_noreplace 202207L // also in [<ios>](ios.syn#header:%3cios%3e "31.5.1 Header <ios> synopsis [ios.syn]")#define __cpp_lib_is_aggregate 201703L // freestanding, also in [<type_traits>](meta.type.synop#header:%3ctype_traits%3e "21.3.3 Header <type_­traits> synopsis [meta.type.synop]")#define __cpp_lib_is_constant_evaluated 201811L // freestanding, also in [<type_traits>](meta.type.synop#header:%3ctype_traits%3e "21.3.3 Header <type_­traits> synopsis [meta.type.synop]")#define __cpp_lib_is_final 201402L // freestanding, also in [<type_traits>](meta.type.synop#header:%3ctype_traits%3e "21.3.3 Header <type_­traits> synopsis [meta.type.synop]")#define __cpp_lib_is_implicit_lifetime 202302L // freestanding, also in [<type_traits>](meta.type.synop#header:%3ctype_traits%3e "21.3.3 Header <type_­traits> synopsis [meta.type.synop]")#define __cpp_lib_is_invocable 201703L // freestanding, also in [<type_traits>](meta.type.synop#header:%3ctype_traits%3e "21.3.3 Header <type_­traits> synopsis [meta.type.synop]")#define __cpp_lib_is_layout_compatible 201907L // freestanding, also in [<type_traits>](meta.type.synop#header:%3ctype_traits%3e "21.3.3 Header <type_­traits> synopsis [meta.type.synop]")#define __cpp_lib_is_nothrow_convertible 201806L // freestanding, also in [<type_traits>](meta.type.synop#header:%3ctype_traits%3e "21.3.3 Header <type_­traits> synopsis [meta.type.synop]")#define __cpp_lib_is_null_pointer 201309L // freestanding, also in [<type_traits>](meta.type.synop#header:%3ctype_traits%3e "21.3.3 Header <type_­traits> synopsis [meta.type.synop]")#define __cpp_lib_is_pointer_interconvertible 201907L // freestanding, also in [<type_traits>](meta.type.synop#header:%3ctype_traits%3e "21.3.3 Header <type_­traits> synopsis [meta.type.synop]")#define __cpp_lib_is_scoped_enum 202011L // freestanding, also in [<type_traits>](meta.type.synop#header:%3ctype_traits%3e "21.3.3 Header <type_­traits> synopsis [meta.type.synop]")#define __cpp_lib_is_sufficiently_aligned 202411L // also in [<memory>](memory.syn#header:%3cmemory%3e "20.2.2 Header <memory> synopsis [memory.syn]")#define __cpp_lib_is_swappable 201603L // freestanding, also in [<type_traits>](meta.type.synop#header:%3ctype_traits%3e "21.3.3 Header <type_­traits> synopsis [meta.type.synop]")#define __cpp_lib_is_virtual_base_of 202406L // freestanding, also in [<type_traits>](meta.type.synop#header:%3ctype_traits%3e "21.3.3 Header <type_­traits> synopsis [meta.type.synop]")#define __cpp_lib_is_within_lifetime 202306L // freestanding, also in [<type_traits>](meta.type.synop#header:%3ctype_traits%3e "21.3.3 Header <type_­traits> synopsis [meta.type.synop]")#define __cpp_lib_jthread 201911L // also in [<stop_token>](thread.stoptoken.syn#header:%3cstop_token%3e "32.3.2 Header <stop_­token> synopsis [thread.stoptoken.syn]"), [<thread>](thread.syn#header:%3cthread%3e "32.4.2 Header <thread> synopsis [thread.syn]")#define __cpp_lib_latch 201907L // also in [<latch>](latch.syn#header:%3clatch%3e "32.9.2.2 Header <latch> synopsis [latch.syn]")#define __cpp_lib_launder 201606L // freestanding, also in [<new>](support.dynamic.general#header:%3cnew%3e "17.6.1 General [support.dynamic.general]")#define __cpp_lib_linalg 202412L // also in [<linalg>](linalg.syn#header:%3clinalg%3e "29.9.2 Header <linalg> synopsis [linalg.syn]")#define __cpp_lib_list_remove_return_type 201806L // also in [<forward_list>](forward.list.syn#header:%3cforward_list%3e "23.3.6 Header <forward_­list> synopsis [forward.list.syn]"), [<list>](list.syn#header:%3clist%3e "23.3.10 Header <list> synopsis [list.syn]")#define __cpp_lib_logical_traits 201510L // freestanding, also in [<type_traits>](meta.type.synop#header:%3ctype_traits%3e "21.3.3 Header <type_­traits> synopsis [meta.type.synop]")#define __cpp_lib_make_from_tuple 201606L // freestanding, also in [<tuple>](tuple.syn#header:%3ctuple%3e "22.4.2 Header <tuple> synopsis [tuple.syn]")#define __cpp_lib_make_reverse_iterator 201402L // freestanding, also in [<iterator>](iterator.synopsis#header:%3citerator%3e "24.2 Header <iterator>&nbsp;synopsis [iterator.synopsis]")#define __cpp_lib_make_unique 201304L // also in [<memory>](memory.syn#header:%3cmemory%3e "20.2.2 Header <memory> synopsis [memory.syn]")#define __cpp_lib_map_try_emplace 201411L // also in [<map>](associative.map.syn#header:%3cmap%3e "23.4.2 Header <map> synopsis [associative.map.syn]")#define __cpp_lib_math_constants 201907L // also in [<numbers>](numbers.syn#header:%3cnumbers%3e "29.8.1 Header <numbers> synopsis [numbers.syn]")#define __cpp_lib_math_special_functions 201603L // also in [<cmath>](cmath.syn#header:%3ccmath%3e "29.7.1 Header <cmath> synopsis [cmath.syn]")#define __cpp_lib_mdspan 202406L // freestanding, also in [<mdspan>](mdspan.syn#header:%3cmdspan%3e "23.7.3.2 Header <mdspan> synopsis [mdspan.syn]")#define __cpp_lib_memory_resource 201603L // also in [<memory_resource>](mem.res.syn#header:%3cmemory_resource%3e "20.5.1 Header <memory_­resource> synopsis [mem.res.syn]")#define __cpp_lib_modules 202207L // freestanding#define __cpp_lib_move_iterator_concept 202207L // freestanding, also in [<iterator>](iterator.synopsis#header:%3citerator%3e "24.2 Header <iterator>&nbsp;synopsis [iterator.synopsis]")#define __cpp_lib_move_only_function 202110L // also in [<functional>](functional.syn#header:%3cfunctional%3e "22.10.2 Header <functional> synopsis [functional.syn]")#define __cpp_lib_node_extract 201606L// also in [<map>](associative.map.syn#header:%3cmap%3e "23.4.2 Header <map> synopsis [associative.map.syn]"), [<set>](associative.set.syn#header:%3cset%3e "23.4.5 Header <set> synopsis [associative.set.syn]"), [<unordered_map>](unord.map.syn#header:%3cunordered_map%3e "23.5.2 Header <unordered_­map> synopsis [unord.map.syn]"), [<unordered_set>](unord.set.syn#header:%3cunordered_set%3e "23.5.5 Header <unordered_­set> synopsis [unord.set.syn]")#define __cpp_lib_nonmember_container_access 201411L// freestanding, also in [<array>](array.syn#header:%3carray%3e "23.3.2 Header <array> synopsis [array.syn]"), [<deque>](deque.syn#header:%3cdeque%3e "23.3.4 Header <deque> synopsis [deque.syn]"), [<forward_list>](forward.list.syn#header:%3cforward_list%3e "23.3.6 Header <forward_­list> synopsis [forward.list.syn]"), [<iterator>](iterator.synopsis#header:%3citerator%3e "24.2 Header <iterator>&nbsp;synopsis [iterator.synopsis]"), [<list>](list.syn#header:%3clist%3e "23.3.10 Header <list> synopsis [list.syn]"), [<map>](associative.map.syn#header:%3cmap%3e "23.4.2 Header <map> synopsis [associative.map.syn]"), [<regex>](re.syn#header:%3cregex%3e "28.6.3 Header <regex> synopsis [re.syn]"), [<set>](associative.set.syn#header:%3cset%3e "23.4.5 Header <set> synopsis [associative.set.syn]"),// [<string>](string.syn#header:%3cstring%3e "27.4.2 Header <string> synopsis [string.syn]"), [<unordered_map>](unord.map.syn#header:%3cunordered_map%3e "23.5.2 Header <unordered_­map> synopsis [unord.map.syn]"), [<unordered_set>](unord.set.syn#header:%3cunordered_set%3e "23.5.5 Header <unordered_­set> synopsis [unord.set.syn]"), [<vector>](vector.syn#header:%3cvector%3e "23.3.12 Header <vector> synopsis [vector.syn]")#define __cpp_lib_not_fn 202306L // freestanding, also in [<functional>](functional.syn#header:%3cfunctional%3e "22.10.2 Header <functional> synopsis [functional.syn]")#define __cpp_lib_null_iterators 201304L // freestanding, also in [<iterator>](iterator.synopsis#header:%3citerator%3e "24.2 Header <iterator>&nbsp;synopsis [iterator.synopsis]")#define __cpp_lib_observable_checkpoint 202506L // freestanding, also in [<utility>](utility.syn#header:%3cutility%3e "22.2.1 Header <utility> synopsis [utility.syn]")#define __cpp_lib_optional 202506L // also in [<optional>](optional.syn#header:%3coptional%3e "22.5.2 Header <optional> synopsis [optional.syn]")#define __cpp_lib_optional_range_support 202406L // freestanding, also in [<optional>](optional.syn#header:%3coptional%3e "22.5.2 Header <optional> synopsis [optional.syn]")#define __cpp_lib_out_ptr 202311L // freestanding, also in [<memory>](memory.syn#header:%3cmemory%3e "20.2.2 Header <memory> synopsis [memory.syn]")#define __cpp_lib_parallel_algorithm 202506L// also in [<algorithm>](algorithm.syn#header:%3calgorithm%3e "26.4 Header <algorithm> synopsis [algorithm.syn]"), [<numeric>](numeric.ops.overview#header:%3cnumeric%3e "26.9 Header <numeric> synopsis [numeric.ops.overview]"), [<memory>](memory.syn#header:%3cmemory%3e "20.2.2 Header <memory> synopsis [memory.syn]")#define __cpp_lib_parallel_scheduler 202506L // also in [<execution>](execution.syn#header:%3cexecution%3e "33.4 Header <execution> synopsis [execution.syn]")#define __cpp_lib_philox_engine 202406L // also in [<random>](rand.synopsis#header:%3crandom%3e "29.5.2 Header <random> synopsis [rand.synopsis]")#define __cpp_lib_polymorphic 202502L // also in [<memory>](memory.syn#header:%3cmemory%3e "20.2.2 Header <memory> synopsis [memory.syn]")#define __cpp_lib_polymorphic_allocator 201902L // also in [<memory_resource>](mem.res.syn#header:%3cmemory_resource%3e "20.5.1 Header <memory_­resource> synopsis [mem.res.syn]")#define __cpp_lib_print 202406L // also in [<print>](print.syn#header:%3cprint%3e "31.7.4 Header <print> synopsis [print.syn]"), [<ostream>](ostream.syn#header:%3costream%3e "31.7.2 Header <ostream> synopsis [ostream.syn]")#define __cpp_lib_quoted_string_io 201304L // also in [<iomanip>](iomanip.syn#header:%3ciomanip%3e "31.7.3 Header <iomanip> synopsis [iomanip.syn]")#define __cpp_lib_ranges 202406L// also in [<algorithm>](algorithm.syn#header:%3calgorithm%3e "26.4 Header <algorithm> synopsis [algorithm.syn]"), [<functional>](functional.syn#header:%3cfunctional%3e "22.10.2 Header <functional> synopsis [functional.syn]"), [<iterator>](iterator.synopsis#header:%3citerator%3e "24.2 Header <iterator>&nbsp;synopsis [iterator.synopsis]"), [<memory>](memory.syn#header:%3cmemory%3e "20.2.2 Header <memory> synopsis [memory.syn]"), [<ranges>](ranges.syn#header:%3cranges%3e "25.2 Header <ranges> synopsis [ranges.syn]")#define __cpp_lib_ranges_as_const 202311L // freestanding, also in [<ranges>](ranges.syn#header:%3cranges%3e "25.2 Header <ranges> synopsis [ranges.syn]")#define __cpp_lib_ranges_as_rvalue 202207L // freestanding, also in [<ranges>](ranges.syn#header:%3cranges%3e "25.2 Header <ranges> synopsis [ranges.syn]")#define __cpp_lib_ranges_cache_latest 202411L // freestanding, also in [<ranges>](ranges.syn#header:%3cranges%3e "25.2 Header <ranges> synopsis [ranges.syn]")#define __cpp_lib_ranges_cartesian_product 202207L // freestanding, also in [<ranges>](ranges.syn#header:%3cranges%3e "25.2 Header <ranges> synopsis [ranges.syn]")#define __cpp_lib_ranges_chunk 202202L // freestanding, also in [<ranges>](ranges.syn#header:%3cranges%3e "25.2 Header <ranges> synopsis [ranges.syn]")#define __cpp_lib_ranges_chunk_by 202202L // freestanding, also in [<ranges>](ranges.syn#header:%3cranges%3e "25.2 Header <ranges> synopsis [ranges.syn]")#define __cpp_lib_ranges_concat 202403L // freestanding, also in [<ranges>](ranges.syn#header:%3cranges%3e "25.2 Header <ranges> synopsis [ranges.syn]")#define __cpp_lib_ranges_contains 202207L // also in [<algorithm>](algorithm.syn#header:%3calgorithm%3e "26.4 Header <algorithm> synopsis [algorithm.syn]")#define __cpp_lib_ranges_enumerate 202302L // also in [<ranges>](ranges.syn#header:%3cranges%3e "25.2 Header <ranges> synopsis [ranges.syn]")#define __cpp_lib_ranges_find_last 202207L // also in [<algorithm>](algorithm.syn#header:%3calgorithm%3e "26.4 Header <algorithm> synopsis [algorithm.syn]")#define __cpp_lib_ranges_fold 202207L // also in [<algorithm>](algorithm.syn#header:%3calgorithm%3e "26.4 Header <algorithm> synopsis [algorithm.syn]")#define __cpp_lib_ranges_generate_random 202403L // also in [<random>](rand.synopsis#header:%3crandom%3e "29.5.2 Header <random> synopsis [rand.synopsis]")#define __cpp_lib_ranges_indices 202506L // also in [<ranges>](ranges.syn#header:%3cranges%3e "25.2 Header <ranges> synopsis [ranges.syn]")#define __cpp_lib_ranges_iota 202202L // also in [<numeric>](numeric.ops.overview#header:%3cnumeric%3e "26.9 Header <numeric> synopsis [numeric.ops.overview]")#define __cpp_lib_ranges_join_with 202202L // freestanding, also in [<ranges>](ranges.syn#header:%3cranges%3e "25.2 Header <ranges> synopsis [ranges.syn]")#define __cpp_lib_ranges_repeat 202207L // freestanding, also in [<ranges>](ranges.syn#header:%3cranges%3e "25.2 Header <ranges> synopsis [ranges.syn]")#define __cpp_lib_ranges_reserve_hint 202502L // also in [<ranges>](ranges.syn#header:%3cranges%3e "25.2 Header <ranges> synopsis [ranges.syn]")#define __cpp_lib_ranges_slide 202202L // freestanding, also in [<ranges>](ranges.syn#header:%3cranges%3e "25.2 Header <ranges> synopsis [ranges.syn]")#define __cpp_lib_ranges_starts_ends_with 202106L // also in [<algorithm>](algorithm.syn#header:%3calgorithm%3e "26.4 Header <algorithm> synopsis [algorithm.syn]")#define __cpp_lib_ranges_stride 202207L // freestanding, also in [<ranges>](ranges.syn#header:%3cranges%3e "25.2 Header <ranges> synopsis [ranges.syn]")#define __cpp_lib_ranges_to_container 202202L // freestanding, also in [<ranges>](ranges.syn#header:%3cranges%3e "25.2 Header <ranges> synopsis [ranges.syn]")#define __cpp_lib_ranges_to_input 202502L // freestanding, also in [<ranges>](ranges.syn#header:%3cranges%3e "25.2 Header <ranges> synopsis [ranges.syn]")#define __cpp_lib_ranges_zip 202110L// freestanding, also in [<ranges>](ranges.syn#header:%3cranges%3e "25.2 Header <ranges> synopsis [ranges.syn]"), [<tuple>](tuple.syn#header:%3ctuple%3e "22.4.2 Header <tuple> synopsis [tuple.syn]"), [<utility>](utility.syn#header:%3cutility%3e "22.2.1 Header <utility> synopsis [utility.syn]")#define __cpp_lib_ratio 202306L // freestanding, also in [<ratio>](ratio.syn#header:%3cratio%3e "21.5.2 Header <ratio> synopsis [ratio.syn]")#define __cpp_lib_raw_memory_algorithms 202411L // also in [<memory>](memory.syn#header:%3cmemory%3e "20.2.2 Header <memory> synopsis [memory.syn]")#define __cpp_lib_rcu 202306L // also in [<rcu>](rcu.syn#header:%3crcu%3e "32.11.2.2 Header <rcu> synopsis [rcu.syn]")#define __cpp_lib_reference_from_temporary 202202L // freestanding, also in [<type_traits>](meta.type.synop#header:%3ctype_traits%3e "21.3.3 Header <type_­traits> synopsis [meta.type.synop]")#define __cpp_lib_reference_wrapper 202403L // freestanding, also in [<functional>](functional.syn#header:%3cfunctional%3e "22.10.2 Header <functional> synopsis [functional.syn]")#define __cpp_lib_reflection 202506L // also in [<meta>](meta.syn#header:%3cmeta%3e "21.4.1 Header <meta> synopsis [meta.syn]")#define __cpp_lib_remove_cvref 201711L // freestanding, also in [<type_traits>](meta.type.synop#header:%3ctype_traits%3e "21.3.3 Header <type_­traits> synopsis [meta.type.synop]")#define __cpp_lib_result_of_sfinae 201210L// freestanding, also in [<functional>](functional.syn#header:%3cfunctional%3e "22.10.2 Header <functional> synopsis [functional.syn]"), [<type_traits>](meta.type.synop#header:%3ctype_traits%3e "21.3.3 Header <type_­traits> synopsis [meta.type.synop]")#define __cpp_lib_robust_nonmodifying_seq_ops 201304L // also in [<algorithm>](algorithm.syn#header:%3calgorithm%3e "26.4 Header <algorithm> synopsis [algorithm.syn]")#define __cpp_lib_sample 201603L // also in [<algorithm>](algorithm.syn#header:%3calgorithm%3e "26.4 Header <algorithm> synopsis [algorithm.syn]")#define __cpp_lib_saturation_arithmetic 202311L // also in [<numeric>](numeric.ops.overview#header:%3cnumeric%3e "26.9 Header <numeric> synopsis [numeric.ops.overview]")#define __cpp_lib_scoped_lock 201703L // also in [<mutex>](mutex.syn#header:%3cmutex%3e "32.6.2 Header <mutex> synopsis [mutex.syn]")#define __cpp_lib_semaphore 201907L // also in [<semaphore>](semaphore.syn#header:%3csemaphore%3e "32.8.2 Header <semaphore> synopsis [semaphore.syn]")#define __cpp_lib_senders 202506L // also in [<execution>](execution.syn#header:%3cexecution%3e "33.4 Header <execution> synopsis [execution.syn]")#define __cpp_lib_shared_mutex 201505L // also in [<shared_mutex>](shared.mutex.syn#header:%3cshared_mutex%3e "32.6.3 Header <shared_­mutex> synopsis [shared.mutex.syn]")#define __cpp_lib_shared_ptr_arrays 201707L // also in [<memory>](memory.syn#header:%3cmemory%3e "20.2.2 Header <memory> synopsis [memory.syn]")#define __cpp_lib_shared_ptr_weak_type 201606L // also in [<memory>](memory.syn#header:%3cmemory%3e "20.2.2 Header <memory> synopsis [memory.syn]")#define __cpp_lib_shared_timed_mutex 201402L // also in [<shared_mutex>](shared.mutex.syn#header:%3cshared_mutex%3e "32.6.3 Header <shared_­mutex> synopsis [shared.mutex.syn]")#define __cpp_lib_shift 202202L // also in [<algorithm>](algorithm.syn#header:%3calgorithm%3e "26.4 Header <algorithm> synopsis [algorithm.syn]")#define __cpp_lib_simd 202506L // also in [<simd>](simd.syn#header:%3csimd%3e "29.10.3 Header <simd> synopsis [simd.syn]")#define __cpp_lib_simd_complex 202502L // also in [<simd>](simd.syn#header:%3csimd%3e "29.10.3 Header <simd> synopsis [simd.syn]")#define __cpp_lib_simd_permutations 202506L // also in [<simd>](simd.syn#header:%3csimd%3e "29.10.3 Header <simd> synopsis [simd.syn]")#define __cpp_lib_smart_ptr_for_overwrite 202002L // also in [<memory>](memory.syn#header:%3cmemory%3e "20.2.2 Header <memory> synopsis [memory.syn]")#define __cpp_lib_smart_ptr_owner_equality 202306L // also in [<memory>](memory.syn#header:%3cmemory%3e "20.2.2 Header <memory> synopsis [memory.syn]")#define __cpp_lib_source_location 201907L // freestanding, also in [<source_location>](source.location.syn#header:%3csource_location%3e "17.8.1 Header <source_­location> synopsis [source.location.syn]")#define __cpp_lib_span 202311L // freestanding, also in [<span>](span.syn#header:%3cspan%3e "23.7.2.1 Header <span> synopsis [span.syn]")#define __cpp_lib_span_initializer_list 202311L // freestanding, also in [<span>](span.syn#header:%3cspan%3e "23.7.2.1 Header <span> synopsis [span.syn]")#define __cpp_lib_spanstream 202106L // also in [<spanstream>](span.streams.overview#header:%3cspanstream%3e "31.9.1 Overview [span.streams.overview]")#define __cpp_lib_ssize 201902L // freestanding, also in [<iterator>](iterator.synopsis#header:%3citerator%3e "24.2 Header <iterator>&nbsp;synopsis [iterator.synopsis]")#define __cpp_lib_sstream_from_string_view 202306L // also in [<sstream>](sstream.syn#header:%3csstream%3e "31.8.1 Header <sstream> synopsis [sstream.syn]")#define __cpp_lib_stacktrace 202011L // also in [<stacktrace>](stacktrace.syn#header:%3cstacktrace%3e "19.6.2 Header <stacktrace> synopsis [stacktrace.syn]")#define __cpp_lib_start_lifetime_as 202207L // freestanding, also in [<memory>](memory.syn#header:%3cmemory%3e "20.2.2 Header <memory> synopsis [memory.syn]")#define __cpp_lib_starts_ends_with 201711L // also in [<string>](string.syn#header:%3cstring%3e "27.4.2 Header <string> synopsis [string.syn]"), [<string_view>](string.view.synop#header:%3cstring_view%3e "27.3.2 Header <string_­view> synopsis [string.view.synop]")#define __cpp_lib_stdatomic_h 202011L // also in [<stdatomic.h>](stdatomic.h.syn#header:%3cstdatomic.h%3e "32.5.12 C compatibility [stdatomic.h.syn]")#define __cpp_lib_string_contains 202011L // also in [<string>](string.syn#header:%3cstring%3e "27.4.2 Header <string> synopsis [string.syn]"), [<string_view>](string.view.synop#header:%3cstring_view%3e "27.3.2 Header <string_­view> synopsis [string.view.synop]")#define __cpp_lib_string_resize_and_overwrite 202110L // also in [<string>](string.syn#header:%3cstring%3e "27.4.2 Header <string> synopsis [string.syn]")#define __cpp_lib_string_subview 202506L // also in [<string>](string.syn#header:%3cstring%3e "27.4.2 Header <string> synopsis [string.syn]"), [<string_view>](string.view.synop#header:%3cstring_view%3e "27.3.2 Header <string_­view> synopsis [string.view.synop]")#define __cpp_lib_string_udls 201304L // also in [<string>](string.syn#header:%3cstring%3e "27.4.2 Header <string> synopsis [string.syn]")#define __cpp_lib_string_view 202403L // also in [<string>](string.syn#header:%3cstring%3e "27.4.2 Header <string> synopsis [string.syn]"), [<string_view>](string.view.synop#header:%3cstring_view%3e "27.3.2 Header <string_­view> synopsis [string.view.synop]")#define __cpp_lib_submdspan 202411L // freestanding, also in [<mdspan>](mdspan.syn#header:%3cmdspan%3e "23.7.3.2 Header <mdspan> synopsis [mdspan.syn]")#define __cpp_lib_syncbuf 201803L // also in [<syncstream>](syncstream.syn#header:%3csyncstream%3e "31.11.1 Header <syncstream> synopsis [syncstream.syn]")#define __cpp_lib_task 202506L // also in [<execution>](execution.syn#header:%3cexecution%3e "33.4 Header <execution> synopsis [execution.syn]")#define __cpp_lib_text_encoding 202306L // also in [<text_encoding>](text.encoding.syn#header:%3ctext_encoding%3e "28.4.1 Header <text_­encoding> synopsis [text.encoding.syn]")#define __cpp_lib_three_way_comparison 201907L // freestanding, also in [<compare>](compare.syn#header:%3ccompare%3e "17.12.1 Header <compare> synopsis [compare.syn]")#define __cpp_lib_to_address 201711L // freestanding, also in [<memory>](memory.syn#header:%3cmemory%3e "20.2.2 Header <memory> synopsis [memory.syn]")#define __cpp_lib_to_array 201907L // freestanding, also in [<array>](array.syn#header:%3carray%3e "23.3.2 Header <array> synopsis [array.syn]")#define __cpp_lib_to_chars 202306L // also in [<charconv>](charconv.syn#header:%3ccharconv%3e "28.2.1 Header <charconv> synopsis [charconv.syn]")#define __cpp_lib_to_string 202306L // also in [<string>](string.syn#header:%3cstring%3e "27.4.2 Header <string> synopsis [string.syn]")#define __cpp_lib_to_underlying 202102L // freestanding, also in [<utility>](utility.syn#header:%3cutility%3e "22.2.1 Header <utility> synopsis [utility.syn]")#define __cpp_lib_transformation_trait_aliases 201304L // freestanding, also in [<type_traits>](meta.type.synop#header:%3ctype_traits%3e "21.3.3 Header <type_­traits> synopsis [meta.type.synop]")#define __cpp_lib_transparent_operators 201510L// freestanding, also in [<memory>](memory.syn#header:%3cmemory%3e "20.2.2 Header <memory> synopsis [memory.syn]"), [<functional>](functional.syn#header:%3cfunctional%3e "22.10.2 Header <functional> synopsis [functional.syn]")#define __cpp_lib_trivially_relocatable 202502L// freestanding, also in [<memory>](memory.syn#header:%3cmemory%3e "20.2.2 Header <memory> synopsis [memory.syn]"), [<type_traits>](meta.type.synop#header:%3ctype_traits%3e "21.3.3 Header <type_­traits> synopsis [meta.type.synop]")#define __cpp_lib_tuple_element_t 201402L // freestanding, also in [<tuple>](tuple.syn#header:%3ctuple%3e "22.4.2 Header <tuple> synopsis [tuple.syn]")#define __cpp_lib_tuple_like 202311L// also in [<utility>](utility.syn#header:%3cutility%3e "22.2.1 Header <utility> synopsis [utility.syn]"), [<tuple>](tuple.syn#header:%3ctuple%3e "22.4.2 Header <tuple> synopsis [tuple.syn]"), [<map>](associative.map.syn#header:%3cmap%3e "23.4.2 Header <map> synopsis [associative.map.syn]"), [<unordered_map>](unord.map.syn#header:%3cunordered_map%3e "23.5.2 Header <unordered_­map> synopsis [unord.map.syn]")#define __cpp_lib_tuples_by_type 201304L // freestanding, also in [<utility>](utility.syn#header:%3cutility%3e "22.2.1 Header <utility> synopsis [utility.syn]"), [<tuple>](tuple.syn#header:%3ctuple%3e "22.4.2 Header <tuple> synopsis [tuple.syn]")#define __cpp_lib_type_identity 201806L // freestanding, also in [<type_traits>](meta.type.synop#header:%3ctype_traits%3e "21.3.3 Header <type_­traits> synopsis [meta.type.synop]")#define __cpp_lib_type_order 202506L // also in [<compare>](compare.syn#header:%3ccompare%3e "17.12.1 Header <compare> synopsis [compare.syn]")#define __cpp_lib_type_trait_variable_templates 201510L // freestanding, also in [<type_traits>](meta.type.synop#header:%3ctype_traits%3e "21.3.3 Header <type_­traits> synopsis [meta.type.synop]")#define __cpp_lib_uncaught_exceptions 201411L // freestanding, also in [<exception>](support.exception.general#header:%3cexception%3e "17.9.1 General [support.exception.general]")#define __cpp_lib_unordered_map_try_emplace 201411L // also in [<unordered_map>](unord.map.syn#header:%3cunordered_map%3e "23.5.2 Header <unordered_­map> synopsis [unord.map.syn]")#define __cpp_lib_unreachable 202202L // freestanding, also in [<utility>](utility.syn#header:%3cutility%3e "22.2.1 Header <utility> synopsis [utility.syn]")#define __cpp_lib_unwrap_ref 201811L // freestanding, also in [<type_traits>](meta.type.synop#header:%3ctype_traits%3e "21.3.3 Header <type_­traits> synopsis [meta.type.synop]")#define __cpp_lib_variant 202306L // also in [<variant>](variant.syn#header:%3cvariant%3e "22.6.2 Header <variant> synopsis [variant.syn]")#define __cpp_lib_void_t 201411L // freestanding, also in [<type_traits>](meta.type.synop#header:%3ctype_traits%3e "21.3.3 Header <type_­traits> synopsis [meta.type.synop]")

[3](#3)

[#](http://github.com/Eelis/draft/tree/9adde4bc1c62ec234483e63ea3b70a59724c745a/source/support.tex#L867)

Additionally, each of the following macros is defined in a hardened implementation:#define __cpp_lib_hardened_array 202502L // also in [<array>](array.syn#header:%3carray%3e "23.3.2 Header <array> synopsis [array.syn]")#define __cpp_lib_hardened_basic_stacktrace 202506L // also in [<stacktrace>](stacktrace.syn#header:%3cstacktrace%3e "19.6.2 Header <stacktrace> synopsis [stacktrace.syn]")#define __cpp_lib_hardened_basic_string 202502L // also in [<string>](string.syn#header:%3cstring%3e "27.4.2 Header <string> synopsis [string.syn]")#define __cpp_lib_hardened_basic_string_view 202502L // also in [<string_view>](string.view.synop#header:%3cstring_view%3e "27.3.2 Header <string_­view> synopsis [string.view.synop]")#define __cpp_lib_hardened_bitset 202502L // also in [<bitset>](bitset.syn#header:%3cbitset%3e "22.9.1 Header <bitset> synopsis [bitset.syn]")#define __cpp_lib_hardened_common_iterator 202506L // also in [<iterator>](iterator.synopsis#header:%3citerator%3e "24.2 Header <iterator>&nbsp;synopsis [iterator.synopsis]")#define __cpp_lib_hardened_counted_iterator 202506L // also in [<iterator>](iterator.synopsis#header:%3citerator%3e "24.2 Header <iterator>&nbsp;synopsis [iterator.synopsis]")#define __cpp_lib_hardened_deque 202502L // also in [<deque>](deque.syn#header:%3cdeque%3e "23.3.4 Header <deque> synopsis [deque.syn]")#define __cpp_lib_hardened_expected 202502L // also in [<expected>](expected.syn#header:%3cexpected%3e "22.8.2 Header <expected> synopsis [expected.syn]")#define __cpp_lib_hardened_forward_list 202502L // also in [<forward_list>](forward.list.syn#header:%3cforward_list%3e "23.3.6 Header <forward_­list> synopsis [forward.list.syn]")#define __cpp_lib_hardened_inplace_vector 202502L // also in [<inplace_vector>](inplace.vector.syn#header:%3cinplace_vector%3e "23.3.15 Header <inplace_­vector> synopsis [inplace.vector.syn]")#define __cpp_lib_hardened_list 202502L // also in [<list>](list.syn#header:%3clist%3e "23.3.10 Header <list> synopsis [list.syn]")#define __cpp_lib_hardened_mdspan 202502L // also in [<mdspan>](mdspan.syn#header:%3cmdspan%3e "23.7.3.2 Header <mdspan> synopsis [mdspan.syn]")#define __cpp_lib_hardened_optional 202502L // also in [<optional>](optional.syn#header:%3coptional%3e "22.5.2 Header <optional> synopsis [optional.syn]")#define __cpp_lib_hardened_shared_ptr_array 202506L // also in [<memory>](memory.syn#header:%3cmemory%3e "20.2.2 Header <memory> synopsis [memory.syn]")#define __cpp_lib_hardened_span 202502L // also in [<span>](span.syn#header:%3cspan%3e "23.7.2.1 Header <span> synopsis [span.syn]")#define __cpp_lib_hardened_valarray 202502L // also in [<valarray>](valarray.syn#header:%3cvalarray%3e "29.6.1 Header <valarray> synopsis [valarray.syn]")#define __cpp_lib_hardened_vector 202502L // also in [<vector>](vector.syn#header:%3cvector%3e "23.3.12 Header <vector> synopsis [vector.syn]")#define __cpp_lib_hardened_view_interface 202506L // also in [<ranges>](ranges.syn#header:%3cranges%3e "25.2 Header <ranges> synopsis [ranges.syn]")

[4](#4)

[#](http://github.com/Eelis/draft/tree/9adde4bc1c62ec234483e63ea3b70a59724c745a/source/support.tex#L891)

The macro __cpp_lib_freestanding_operator_new is defined to
the integer literal 202306L if all the default versions of the replaceable global allocation functions meet
the requirements of a hosted implementation, and
to the integer literal 0 otherwise ([[new.delete]](new.delete "17.6.3 Storage allocation and deallocation"))[.](#4.sentence-1)

[5](#5)

[#](http://github.com/Eelis/draft/tree/9adde4bc1c62ec234483e63ea3b70a59724c745a/source/support.tex#L898)

*Recommended practice*: Freestanding implementations should only define a macro from [<version>](#header:%3cversion%3e "17.3.2 Header <version> synopsis [version.syn]") if the implementation provides the corresponding facility in its entirety[.](#5.sentence-1)

[6](#6)

[#](http://github.com/Eelis/draft/tree/9adde4bc1c62ec234483e63ea3b70a59724c745a/source/support.tex#L903)

*Recommended practice*: A non-hardened implementation should not define macros from [<version>](#header:%3cversion%3e "17.3.2 Header <version> synopsis [version.syn]") required for hardened implementations[.](#6.sentence-1)