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      最終更新日時(UTC):
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        2025年08月11日 06時35分16秒
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  <h1 itemprop="name"><span class="token">機能テストマクロ</span><span class="cpp cpp23" title="C++23で追加">(C++23)</span></h1>
<div itemprop="articleBody"><p></p>
<p>このページはC++23に採用された言語機能の変更を解説しています。</p>
<p>のちのC++規格でさらに変更される場合があるため<a href="#relative-page">関連項目</a>を参照してください。</p>
<h2>概要</h2>
<h3>言語機能</h3>
<table border="1" bordercolor="#888" style="border-collapse:collapse">
<th>マクロ名</th>
<th>機能</th>
<td><code>__cpp_auto_cast</code></td>
<td><code>202110L</code></td>
<td><code>auto(x)</code>および<code>auto{x}</code>によるキャスト</td>
<td><code>__cpp_constexpr</code></td>
<td><code>202211L</code></td>
<td><a href="permitting_static_constexpr_variables_in_constexpr_functions.html">constexpr関数内でのstatic constexpr変数を許可</a></td>
<td><code>__cpp_explicit_this_parameter</code></td>
<td><code>202110L</code></td>
<td>自身のオブジェクトを明示的にパラメータとして指定する</td>
<td><code>__cpp_if_consteval</code></td>
<td><code>202106L</code></td>
<td><a href="if_consteval.html">if consteval</a></td>
<td><code>__cpp_implicit_move</code></td>
<td><code>202207L</code></td>
<td><a href="simpler_implicit_move.html">暗黙的なムーブを簡略化</a></td>
<td><code>__cpp_multidimensional_subscript</code></td>
<td><code>202211L</code></td>
<td><a href="multidimensional_subscript_operator.html">添字演算子の多次元サポート</a></td>
<td><code>__cpp_named_character_escapes</code></td>
<td><code>202207L</code></td>
<td><a href="named_universal_character_escapes.html">名前付きユニバーサルキャラクタ名</a></td>
<td><code>__cpp_range_based_for</code></td>
<td><code>202211L</code></td>
<td><a href="lifetime_extension_in_range_based_for_loop.html">範囲for文が範囲初期化子内で生じた一時オブジェクトを延命することを規定</a></td>
<td><code>__cpp_size_t_suffix</code></td>
<td><code>202011L</code></td>
<td><a href="literal_suffix_for_signed_size_t.html">(符号付き)size_tリテラルのためのサフィックス</a></td>
<td><code>__cpp_static_call_operator</code></td>
<td><code>202207L</code></td>
<td><a href="static_operator.html">thisポインタをもつ必要のない演算子をstaticとして宣言できるようにする</a></td>
<h3>ライブラリ</h3>
<p>ライブラリの機能テストマクロは全て<code><a href="../../reference/version.html">&lt;version&gt;</a></code>でも提供される。</p>
<table border="1" bordercolor="#888" style="border-collapse:collapse">
<th>マクロ名</th>
<th>機能</th>
<th>ヘッダ</th>
<td><code>__cpp_lib_adaptor_iterator_pair_constructor</code></td>
<td><code>202106L</code></td>
<td><code><a href="../../reference/queue.html">std::queue</a></code>と<code><a href="../../reference/stack.html">std::stack</a></code>にイテレータ２つのコンストラクタを追加</td>
<td><code><a href="../../reference/queue.html">&lt;queue&gt;</a></code><br /><code><a href="../../reference/stack.html">&lt;stack&gt;</a></code></td>
<td><code>__cpp_lib_algorithm_iterator_requirements</code></td>
<td><code>202207L</code></td>
<td><code><a href="../../reference/algorithm.html">&lt;algorithm&gt;</a></code>のRangeイテレータ対応</td>
<td><code><a href="../../reference/algorithm.html">&lt;algorithm&gt;</a></code><br /><code><a href="../../reference/memory.html">&lt;memory&gt;</a></code><br /><code><a href="../../reference/numeric.html">&lt;numeric&gt;</a></code></td>
<td><code>__cpp_lib_allocate_at_least</code></td>
<td><code>202302L</code></td>
<td><code><a href="../../reference/memory/allocator/allocate_at_least.html">std::allocator::allocate_at_least()</a></code>の追加</td>
<td><code><a href="../../reference/memory.html">&lt;memory&gt;</a></code></td>
<td><code>__cpp_lib_associative_heterogeneous_erasure</code></td>
<td><code>202110L</code></td>
<td>テンプレート型を受ける<code>erase()</code>の追加</td>
<td><code><a href="../../reference/map.html">&lt;map&gt;</a></code><br /><code><a href="../../reference/set.html">&lt;set&gt;</a></code><br /><code><a href="../../reference/unordered_map.html">&lt;unordered_map&gt;</a></code><br /><code><a href="../../reference/unordered_set.html">&lt;unordered_set&gt;</a></code></td>
<td><code>__cpp_lib_barrier</code></td>
<td><code>202302L</code></td>
<td>バリアフェーズの完了ステップの仕様変更</td>
<td><code><a href="../../reference/barrier.html">&lt;barrier&gt;</a></code></td>
<td><code>__cpp_lib_bind_back</code></td>
<td><code>202202L</code></td>
<td><code><a href="../../reference/functional/bind_back.html">std::bind_back()</a></code>の追加</td>
<td><code><a href="../../reference/functional.html">&lt;functional&gt;</a></code></td>
<td><code>__cpp_lib_byteswap</code></td>
<td><code>202110L</code></td>
<td><code><a href="../../reference/bit/byteswap.html">std::byteswap()</a></code>の追加</td>
<td><code><a href="../../reference/bit.html">&lt;bit&gt;</a></code></td>
<td><code>__cpp_lib_common_reference</code></td>
<td><code>202302L</code></td>
<td><code>T&amp;</code>と<code>reference_wrapper&lt;T&gt;</code>の<code>common_reference</code>を<code>T&amp;</code>に変換</td>
<td><code><a href="../../reference/type_traits.html">&lt;type_traits&gt;</a></code></td>
<td><code>__cpp_lib_common_reference_wrapper</code></td>
<td><code>202302L</code></td>
<td><code>T&amp;</code>と<code>reference_wrapper&lt;T&gt;</code>の<code>common_reference</code>を<code>T&amp;</code>に変換</td>
<td><code><a href="../../reference/functional.html">&lt;functional&gt;</a></code></td>
<td><code>__cpp_lib_concepts</code></td>
<td><code>202207L</code></td>
<td><code><a href="../../reference/concepts/equality_comparable.html">std::equality_comparable_with</a></code>などをムーブのみ可能な型に対応</td>
<td><code><a href="../../reference/compare.html">&lt;compare&gt;</a></code><br /><code><a href="../../reference/concepts.html">&lt;concepts&gt;</a></code></td>
<td><code>__cpp_lib_constexpr_bitset</code></td>
<td><code>202207L</code></td>
<td><code><a href="../../reference/bitset/bitset.html">std::bitset</a></code>の<code>constexpr</code>対応</td>
<td><code><a href="../../reference/bitset.html">&lt;bitset&gt;</a></code></td>
<td><code>__cpp_lib_constexpr_charconv</code></td>
<td><code>202207L</code></td>
<td><code><a href="../../reference/charconv/to_chars.html">std::to_chars()</a></code>と<code><a href="../../reference/charconv/from_chars.html">std::from_chars()</a></code>の<code>constexpr</code>対応</td>
<td><code><a href="../../reference/charconv.html">&lt;charconv&gt;</a></code></td>
<td><code>__cpp_lib_constexpr_cmath</code></td>
<td><code>202202L</code></td>
<td>いくつかの関数を<code>constexpr</code>対応</td>
<td><code><a href="../../reference/cmath.html">&lt;cmath&gt;</a></code><br /><code><a href="../../reference/cstdlib.html">&lt;cstdlib&gt;</a></code></td>
<td><code>__cpp_lib_constexpr_memory</code></td>
<td><code>202202L</code></td>
<td><code><a href="../../reference/memory/unique_ptr.html">std::unique_ptr</a></code>の<code>constexpr</code>対応</td>
<td><code><a href="../../reference/memory.html">&lt;memory&gt;</a></code></td>
<td><code>__cpp_lib_constexpr_typeinfo</code></td>
<td><code>202106L</code></td>
<td><code><a href="../../reference/typeinfo/type_info/op_equal.html">std::type_info::operator==()</a></code>の<code>constexpr</code>対応</td>
<td><code><a href="../../reference/typeinfo.html">&lt;typeinfo&gt;</a></code></td>
<td><code>__cpp_lib_containers_ranges</code></td>
<td><code>202202L</code></td>
<td>コンテナのコンストラクタのRange対応</td>
<td><code><a href="../../reference/vector.html">&lt;vector&gt;</a></code><br /><code><a href="../../reference/list.html">&lt;list&gt;</a></code><br /><code><a href="../../reference/forward_list.html">&lt;forward_list&gt;</a></code><br /><code><a href="../../reference/map.html">&lt;map&gt;</a></code><br /><code><a href="../../reference/set.html">&lt;set&gt;</a></code><br /><code><a href="../../reference/unordered_map.html">&lt;unordered_map&gt;</a></code><br /><code><a href="../../reference/unordered_set.html">&lt;unordered_set&gt;</a></code><br /><code><a href="../../reference/deque.html">&lt;deque&gt;</a></code><br /><code><a href="../../reference/queue.html">&lt;queue&gt;</a></code><br /><code><a href="../../reference/stack.html">&lt;stack&gt;</a></code><br /><code><a href="../../reference/string.html">&lt;string&gt;</a></code></td>
<td><code>__cpp_lib_expected</code></td>
<td><code>202211L</code></td>
<td><code><a href="../../reference/expected.html">&lt;expected&gt;</a></code>の追加</td>
<td><code><a href="../../reference/expected.html">&lt;expected&gt;</a></code></td>
<td><code>__cpp_lib_flat_map</code></td>
<td><code>202207L</code></td>
<td><code><a href="../../reference/flat_map/flat_map.html">std::flat_map</a></code>と<code><a href="../../reference/flat_map/flat_multimap.html">std::flat_multimap</a></code>の追加</td>
<td><code><a href="../../reference/flat_map.html">&lt;flat_map&gt;</a></code></td>
<td><code>__cpp_lib_flat_set</code></td>
<td><code>202207L</code></td>
<td><code><a href="../../reference/flat_set/flat_set.html">std::flat_set</a></code>と<code><a href="../../reference/flat_set/flat_multiset.html">std::flat_multiset</a></code>の追加</td>
<td><code><a href="../../reference/flat_set.html">&lt;flat_set&gt;</a></code></td>
<td><code>__cpp_lib_format</code></td>
<td><code>202207L</code></td>
<td><code>std::format</code>の時刻型のローカライズ対応</td>
<td><code><a href="../../reference/format.html">&lt;format&gt;</a></code></td>
<td><code>__cpp_lib_format_ranges</code></td>
<td><code>202207L</code></td>
<td><code><a href="../../reference/format/formatter.html">std::formatter</a></code>のRange対応</td>
<td><code><a href="../../reference/format.html">&lt;format&gt;</a></code></td>
<td><code>__cpp_lib_formatters</code></td>
<td><code>202302L</code></td>
<td><code><a href="../../reference/format/formatter.html">std::formatter</a></code>の<code><a href="../../reference/stacktrace/basic_stacktrace.html">std::stacktrace</a></code>対応と<code><a href="../../reference/thread/thread/id.html">std::thread::id</a></code>対応</td>
<td><code><a href="../../reference/stacktrace.html">&lt;stacktrace&gt;</a></code><br /><code><a href="../../reference/thread.html">&lt;thread&gt;</a></code></td>
<td><code>__cpp_lib_forward_like</code></td>
<td><code>202207L</code></td>
<td><code><a href="../../reference/utility/forward_like.html">std::forward_like()</a></code>の追加</td>
<td><code><a href="../../reference/utility.html">&lt;utility&gt;</a></code></td>
<td><code>__cpp_lib_generator</code></td>
<td><code>202207L</code></td>
<td><code><a href="../../reference/generator/generator.html">std::generator</a></code>の追加</td>
<td><code><a href="../../reference/generator.html">&lt;generator&gt;</a></code></td>
<td><code>__cpp_lib_invoke_r</code></td>
<td><code>202106L</code></td>
<td><code><a href="../../reference/functional/invoke_r.html">std::invoke_r()</a></code>の追加</td>
<td><code><a href="../../reference/functional.html">&lt;functional&gt;</a></code></td>
<td><code>__cpp_lib_ios_noreplace</code></td>
<td><code>202207L</code></td>
<td><code><a href="../../reference/ios/ios_base/type-openmode.html">std::ios::noreplace</a></code>の追加</td>
<td><code><a href="../../reference/ios.html">&lt;ios&gt;</a></code></td>
<td><code>__cpp_lib_is_implicit_lifetime</code></td>
<td><code>202302L</code></td>
<td><code><a href="../../reference/type_traits/is_implicit_lifetime.html">std::is_implicit_lifetime</a></code>の追加</td>
<td><code><a href="../../reference/type_traits.html">&lt;type_traits&gt;</a></code></td>
<td><code>__cpp_lib_is_scoped_enum</code></td>
<td><code>202011L</code></td>
<td><code><a href="../../reference/type_traits/is_scoped_enum.html">std::is_scoped_enum</a></code>の追加</td>
<td><code><a href="../../reference/type_traits.html">&lt;type_traits&gt;</a></code></td>
<td><code>__cpp_lib_mdspan</code></td>
<td><code>202207L</code></td>
<td><code><a href="../../reference/mdspan.html">&lt;mdspan&gt;</a></code>の追加</td>
<td><code><a href="../../reference/mdspan.html">&lt;mdspan&gt;</a></code></td>
<td><code>__cpp_lib_modules</code></td>
<td><code>202207L</code></td>
<td>モジュール<code><a href="../../module/std.html">&lt;std&gt;</a></code>と<code><a href="../../module/std.compat.html">&lt;std.compat&gt;</a></code>の追加</td>
<td><code>__cpp_lib_move_iterator_concept</code></td>
<td><code>202207L</code></td>
<td><code><a href="../../reference/iterator/move_iterator.html">std::move_iterator&lt;T*&gt;</a></code>をランダムアクセスイテレータにする</td>
<td><code><a href="../../reference/iterator.html">&lt;iterator&gt;</a></code></td>
<td><code>__cpp_lib_move_only_function</code></td>
<td><code>202110L</code></td>
<td><code><a href="../../reference/functional/move_only_function.html">std::move_only_function</a></code>の追加</td>
<td><code><a href="../../reference/functional.html">&lt;functional&gt;</a></code></td>
<td><code>__cpp_lib_optional</code></td>
<td><code>202110L</code></td>
<td><code><a href="../../reference/optional/optional.html">std::optional</a></code>にモナド操作を追加</td>
<td><code><a href="../../reference/optional.html">&lt;optional&gt;</a></code></td>
<td><code>__cpp_lib_out_ptr</code></td>
<td><code>202106L</code></td>
<td><code><a href="../../reference/memory/out_ptr.html">std::out_ptr</a></code>と<code><a href="../../reference/memory/inout_ptr.html">std::inout_ptr</a></code>の追加</td>
<td><code><a href="../../reference/memory.html">&lt;memory&gt;</a></code></td>
<td><code>__cpp_lib_ranges</code></td>
<td><code>202302L</code></td>
<td><code><a href="../../reference/ranges/range_adaptor_closure.html">std::ranges::range_adaptor_closure</a></code>の追加<br /><code><a href="../../reference/ranges.html">&lt;ranges&gt;</a></code>の様々な機能追加</td>
<td><code><a href="../../reference/algorithm.html">&lt;algorithm&gt;</a></code><br /><code><a href="../../reference/functional.html">&lt;functional&gt;</a></code><br /><code><a href="../../reference/iterator.html">&lt;iterator&gt;</a></code><br /><code><a href="../../reference/memory.html">&lt;memory&gt;</a></code><br /><code><a href="../../reference/ranges.html">&lt;ranges&gt;</a></code></td>
<td><code>__cpp_lib_ranges_as_const</code></td>
<td><code>202207L</code></td>
<td><code><a href="../../reference/ranges/cbegin.html">std::ranges::cbegin</a></code>が常に定数イテレータを返すようにする。<code><a href="../../reference/ranges/as_const_view.html">std::ranges::as_const_view</a></code>の追加</td>
<td><code><a href="../../reference/ranges.html">&lt;ranges&gt;</a></code></td>
<td><code>__cpp_lib_ranges_as_rvalue</code></td>
<td><code>202207L</code></td>
<td><code><a href="../../reference/ranges/as_rvalue_view.html">std::ranges::as_rvalue_view</a></code>の追加</td>
<td><code><a href="../../reference/ranges.html">&lt;ranges&gt;</a></code></td>
<td><code>__cpp_lib_ranges_cartesian_product</code></td>
<td><code>202207L</code></td>
<td><code><a href="../../reference/ranges/cartesian_product_view.html">std::ranges::cartesian_product_view</a></code>の追加</td>
<td><code><a href="../../reference/ranges.html">&lt;ranges&gt;</a></code></td>
<td><code>__cpp_lib_ranges_chunk</code></td>
<td><code>202202L</code></td>
<td><code><a href="../../reference/ranges/chunk_view.html">std::ranges::chunk_view</a></code>の追加</td>
<td><code><a href="../../reference/ranges.html">&lt;ranges&gt;</a></code></td>
<td><code>__cpp_lib_ranges_chunk_by</code></td>
<td><code>202202L</code></td>
<td><code><a href="../../reference/ranges/chunk_by_view.html">std::ranges::chunk_by_view</a></code>の追加</td>
<td><code><a href="../../reference/ranges.html">&lt;ranges&gt;</a></code></td>
<td><code>__cpp_lib_ranges_contains</code></td>
<td><code>202207L</code></td>
<td><code><a href="../../reference/algorithm/ranges_contains.html">std::ranges::contains()</a></code>の追加</td>
<td><code><a href="../../reference/algorithm.html">&lt;algorithm&gt;</a></code></td>
<td><code>__cpp_lib_ranges_enumerate</code></td>
<td><code>202302L</code></td>
<td><code><a href="../../reference/ranges/enumerate_view.html">std::ranges::enumerate_view</a></code>の追加</td>
<td><code><a href="../../reference/ranges.html">&lt;ranges&gt;</a></code></td>
<td><code>__cpp_lib_ranges_find_last</code></td>
<td><code>202207L</code></td>
<td><code><a href="../../reference/algorithm/ranges_find_last.html">std::ranges::find_last()</a></code>と<code><a href="../../reference/algorithm/ranges_find_last_if.html">std::ranges::find_last_if()</a></code>と<code><a href="../../reference/algorithm/ranges_find_last_if_not.html">std::ranges::find_last_if_not()</a></code>の追加</td>
<td><code><a href="../../reference/algorithm.html">&lt;algorithm&gt;</a></code></td>
<td><code>__cpp_lib_ranges_fold</code></td>
<td><code>202207L</code></td>
<td><code>std::ranges::</code>に<code>fold</code>アルゴリズムの追加</td>
<td><code><a href="../../reference/algorithm.html">&lt;algorithm&gt;</a></code></td>
<td><code>__cpp_lib_ranges_iota</code></td>
<td><code>202202L</code></td>
<td><code><a href="../../reference/numeric/ranges_iota.html">std::ranges::iota()</a></code>の追加</td>
<td><code><a href="../../reference/numeric.html">&lt;numeric&gt;</a></code></td>
<td><code>__cpp_lib_ranges_join_with</code></td>
<td><code>202202L</code></td>
<td><code><a href="../../reference/ranges/join_with_view.html">std::ranges::join_with_view</a></code>の追加</td>
<td><code><a href="../../reference/ranges.html">&lt;ranges&gt;</a></code></td>
<td><code>__cpp_lib_ranges_repeat</code></td>
<td><code>202207L</code></td>
<td><code><a href="../../reference/ranges/repeat_view.html">std::ranges::repeat_view</a></code>の追加</td>
<td><code><a href="../../reference/ranges.html">&lt;ranges&gt;</a></code></td>
<td><code>__cpp_lib_ranges_slide</code></td>
<td><code>202202L</code></td>
<td><code><a href="../../reference/ranges/slide_view.html">std::ranges::slide_view</a></code>の追加</td>
<td><code><a href="../../reference/ranges.html">&lt;ranges&gt;</a></code></td>
<td><code>__cpp_lib_ranges_starts_ends_with</code></td>
<td><code>202106L</code></td>
<td><code><a href="../../reference/algorithm/ranges_starts_with.html">std::ranges::starts_with()</a></code>と<code><a href="../../reference/algorithm/ranges_ends_with.html">std::ranges::ends_with()</a></code>の追加</td>
<td><code><a href="../../reference/algorithm.html">&lt;algorithm&gt;</a></code></td>
<td><code>__cpp_lib_ranges_stride</code></td>
<td><code>202207L</code></td>
<td><code><a href="../../reference/ranges/stride_view.html">std::ranges::stride_view</a></code>の追加</td>
<td><code><a href="../../reference/ranges.html">&lt;ranges&gt;</a></code></td>
<td><code>__cpp_lib_ranges_to_container</code></td>
<td><code>202202L</code></td>
<td><code><a href="../../reference/ranges/to.html">std::ranges::to</a></code>の追加</td>
<td><code><a href="../../reference/ranges.html">&lt;ranges&gt;</a></code></td>
<td><code>__cpp_lib_ranges_zip</code></td>
<td><code>202110L</code></td>
<td><code><a href="../../reference/ranges/zip_view.html">std::ranges::zip_view</a></code>と<code><a href="../../reference/ranges/zip_transform_view.html">std::ranges::zip_transform_view</a></code>と<code><a href="../../reference/ranges/adjacent_view.html">std::ranges::adjacent_view</a></code>と<code><a href="../../reference/ranges/adjacent_transform_view.html">std::ranges::adjacent_transform_view</a></code>の追加</td>
<td><code><a href="../../reference/ranges.html">&lt;ranges&gt;</a></code><br /><code><a href="../../reference/tuple.html">&lt;tuple&gt;</a></code><br /><code><a href="../../reference/utility.html">&lt;utility&gt;</a></code></td>
<td><code>__cpp_lib_reference_from_temporary</code></td>
<td><code>202202L</code></td>
<td><code><a href="../../reference/type_traits/reference_constructs_from_temporary.html">std::reference_constructs_from_temporary</a></code>と<code><a href="../../reference/type_traits/reference_converts_from_temporary.html">std::reference_converts_from_temporary</a></code>の追加</td>
<td><code><a href="../../reference/type_traits.html">&lt;type_traits&gt;</a></code></td>
<td><code>__cpp_lib_shift</code></td>
<td><code>202202L</code></td>
<td><code><a href="../../reference/algorithm/ranges_shift_left.html">std::ranges::shift_left()</a></code>と<code><a href="../../reference/algorithm/ranges_shift_right.html">std::ranges::shift_right()</a></code>の追加</td>
<td><code><a href="../../reference/algorithm.html">&lt;algorithm&gt;</a></code></td>
<td><code>__cpp_lib_spanstream</code></td>
<td><code>202106L</code></td>
<td><code><a href="../../reference/spanstream.html">&lt;spanstream&gt;</a></code>の追加</td>
<td><code><a href="../../reference/spanstream.html">&lt;spanstream&gt;</a></code></td>
<td><code>__cpp_lib_stacktrace</code></td>
<td><code>202011L</code></td>
<td><code><a href="../../reference/stacktrace.html">&lt;stacktrace&gt;</a></code>の追加</td>
<td><code><a href="../../reference/stacktrace.html">&lt;stacktrace&gt;</a></code></td>
<td><code>__cpp_lib_start_lifetime_as</code></td>
<td><code>202207L</code></td>
<td><code><a href="../../reference/memory/start_lifetime_as.html">std::start_lifetime_as()</a></code>の追加</td>
<td><code><a href="../../reference/memory.html">&lt;memory&gt;</a></code></td>
<td><code>__cpp_lib_stdatomic_h</code></td>
<td><code>202011L</code></td>
<td><code><a href="../../reference/stdatomic.h.html">&lt;stdatomic.h&gt;</a></code>の追加</td>
<td><code><a href="../../reference/stdatomic.h.html">&lt;stdatomic.h&gt;</a></code></td>
<td><code>__cpp_lib_string_contains</code></td>
<td><code>202011L</code></td>
<td><code><a href="../../reference/string/basic_string/contains.html">std::basic_string::contains()</a></code>と<code><a href="../../reference/string_view/basic_string_view/contains.html">std::basic_string_view::contains()</a></code>の追加</td>
<td><code><a href="../../reference/string.html">&lt;string&gt;</a></code><br /><code><a href="../../reference/string_view.html">&lt;string_view&gt;</a></code></td>
<td><code>__cpp_lib_string_resize_and_overwrite</code></td>
<td><code>202110L</code></td>
<td><code><a href="../../reference/string/basic_string/resize_and_overwrite.html">std::basic_string::resize_and_overwrite()</a></code>の追加</td>
<td><code><a href="../../reference/string.html">&lt;string&gt;</a></code></td>
<td><code>__cpp_lib_to_underlying</code></td>
<td><code>202102L</code></td>
<td><code><a href="../../reference/utility/to_underlying.html">std::to_underlying()</a></code>の追加</td>
<td><code><a href="../../reference/utility.html">&lt;utility&gt;</a></code></td>
<td><code>__cpp_lib_tuple_like</code></td>
<td><code>202207L</code></td>
<td><code><a href="../../reference/tuple/tuple-like.html">tuple-like</a></code>コンセプトの追加</td>
<td><code><a href="../../reference/map.html">&lt;map&gt;</a></code><br /><code><a href="../../reference/tuple.html">&lt;tuple&gt;</a></code><br /><code><a href="../../reference/unordered_map.html">&lt;unordered_map&gt;</a></code><br /><code><a href="../../reference/utility.html">&lt;utility&gt;</a></code></td>
<td><code>__cpp_lib_unreachable</code></td>
<td><code>202202L</code></td>
<td><code><a href="../../reference/utility/unreachable.html">std::unreachable()</a></code>の追加</td>
<td><code><a href="../../reference/utility.html">&lt;utility&gt;</a></code></td>
<td><code>__cpp_lib_print</code></td>
<td><code>202403L</code></td>
<td><code><a href="../../reference/print.html">&lt;print&gt;</a></code>の追加</td>
<td><code><a href="../../reference/ostream.html">&lt;ostream&gt;</a></code><br /><code><a href="../../reference/print.html">&lt;print&gt;</a></code></td>
<h2>参照</h2>
<li><a href="https://isocpp.org/std/standing-documents/sd-6-sg10-feature-test-recommendations" target="_blank">SD-FeatureTest: Feature-Test Macros and Policies - isocpp</a></li>
</ul></div>
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