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‎lang/cpp26.html‎

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<li>ポインタ出力のサポートを追加</li>
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<li>幅と精度を動的に指定した場合でも型の検証がコンパイル時に行われるよう仕様を見直し</li>
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<li><code>constexpr</code>に対応</li>
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<li>非ロケール版を<code>constexpr</code>に対応</li>
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<li><code><a href="../reference/string/to_string.html">std::to_string()</a></code>と<code><a href="../reference/string/to_wstring.html">std::to_wstring()</a></code>の整数<a class="cpprefjp-defined-word" data-desc="同名の関数を異なる引数・テンプレート・制約などで複数定義すること。または同名の関数の集合">オーバーロード</a>が<code>constexpr</code>に対応</li>

‎reference/format/basic_format_arg.html‎

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<span itemprop="author" itemscope itemtype="http://schema.org/Person">
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<span itemprop="name">Tetsuro Matsumura</span>
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<span itemprop="name">Akira Takahashi</span>
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が更新
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</small></p>
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<td><code>operator bool</code></td>
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<td><code><a href="basic_format_arg/op_bool.html">operator bool</a></code></td>
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<td><code>bool</code>への変換演算子(空の時<code>false</code>)</td>
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<td>C++20</td>
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‎reference/format/basic_format_arg/op_bool.html‎

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2026年01月20日 03時05分18秒
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<br/>
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<span itemprop="author" itemscope itemtype="http://schema.org/Person">
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<span itemprop="name">Akira Takahashi</span>
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が更新
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<span class="fa fa-fw fa-clock-o fa-flip-horizontal"></span>履歴
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<div class="identifier-type">class</div><div class="header">&lt;format&gt;</div><h1 itemprop="name"><span class="namespace" title="namespace std">std::</span><span class="class" title="class basic_format_arg">basic_format_arg::</span><span class="token">operator bool</span><span class="cpp cpp20" title="C++20で追加">(C++20)</span></h1>
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<div itemprop="articleBody"><p><div class="codehilite"><pre><span></span><code><span class="k">explicit</span> <span class="k">operator</span> <span class="nf">bool</span><span class="p">()</span> <span class="k">const</span> <span class="k">noexcept</span><span class="p">;</span> <span class="c1">// (1) C++20</span>
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<span class="k">constexpr</span> <span class="k">explicit</span> <span class="k">operator</span> <span class="nf">bool</span><span class="p">()</span> <span class="k">const</span> <span class="k">noexcept</span><span class="p">;</span> <span class="c1">// (1) C++26</span>
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</code></pre></div>
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</p>
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<h2>概要</h2>
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<p><code>bool</code>型への変換演算子。</p>
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<h2><a class="cpprefjp-defined-word" data-desc="関数呼び出し式の評価結果となるオブジェクト・値">戻り値</a></h2>
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<p>空でない場合に<code>true</code>を返す</p>
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<h2>バージョン</h2>
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<h3>言語</h3>
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<ul>
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<li>C++20</li>
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</ul>
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<h3>処理系</h3>
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<ul>
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<li><a href="../../../implementation.html#clang">Clang</a>: ??</li>
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<li><a href="../../../implementation.html#gcc">GCC</a>: ??</li>
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<li><a href="../../../implementation.html#icc">ICC</a>: ??</li>
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<li><a href="../../../implementation.html#visual_cpp">Visual C++</a>: ??</li>
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</ul>
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<h2>参照</h2>
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<ul>
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<li><a href="https://open-std.org/jtc1/sc22/wg21/docs/papers/2025/p3391r2.html" target="_blank">P3391R2 <code>constexpr std::format</code></a><ul>
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‎reference/format/basic_format_arg/op_constructor.html‎

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2025年07月08日 15時33分39秒
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<span class="k">const</span> <span class="n">char_type</span><span class="o">*</span><span class="p">,</span> <span class="n"><a href="../../string_view/basic_string_view.html">basic_string_view</a></span><span class="o">&lt;</span><span class="n">char_type</span><span class="o">&gt;</span><span class="p">,</span>
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<span class="k">const</span> <span class="kt">void</span><span class="o">*</span><span class="p">,</span> <span class="n"><a href="handle.html">handle</a></span><span class="o">&gt;</span> <span class="n">value</span><span class="p">;</span> <span class="c1">// exposition only</span>
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<span class="k">template</span><span class="o">&lt;</span><span class="k">class</span> <span class="nc">T</span><span class="o">&gt;</span> <span class="k">explicit</span> <span class="n"><i>basic_format_arg</i></span><span class="p">(</span><span class="n">T</span><span class="o">&amp;</span> <span class="n">v</span><span class="p">)</span> <span class="k">noexcept</span><span class="p">;</span> <span class="c1">// (2) exposition only</span>
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<span class="k">template</span><span class="o">&lt;</span><span class="k">class</span> <span class="nc">T</span><span class="o">&gt;</span>
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<ul>
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<li><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2019/p0645r10.html" target="_blank">P0645R10 Text Formatting</a></li>
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<li><a href="https://open-std.org/jtc1/sc22/wg21/docs/papers/2025/p3391r2.html" target="_blank">P3391R2 <code>constexpr std::format</code></a><ul>
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<li>C++26から<code>constexpr</code>に対応した</li>
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</ul>
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</li>
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