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<div class="identifier-type">function template</div><div class="header"><algorithm></div><h1 itemprop="name"><span class="namespace" title="namespace std::ranges">std::ranges::</span><span class="token">fill</span><span class="cpp cpp20" title="C++20で追加">(C++20)</span></h1>
<div itemprop="articleBody"><p><div class="codehilite"><pre><span></span><code><span class="k">namespace</span><span class="w"> </span><span class="nn">std</span><span class="o">::</span><span class="nn">ranges</span><span class="w"> </span><span class="p">{</span>
<span class="w"> </span><span class="k">template</span><span class="w"> </span><span class="o"><</span><span class="k">class</span><span class="w"> </span><span class="nc">T</span><span class="p">,</span>
<span class="w"> </span><span class="n"><a href="../iterator/output_iterator.html">output_iterator</a></span><span class="o"><</span><span class="k">const</span><span class="w"> </span><span class="n">T</span><span class="o">&></span><span class="w"> </span><span class="n">O</span><span class="p">,</span>
<span class="w"> </span><span class="n"><a href="../iterator/sentinel_for.html">sentinel_for</a></span><span class="o"><</span><span class="n">O</span><span class="o">></span><span class="w"> </span><span class="n">S</span><span class="o">></span>
<span class="w"> </span><span class="k">constexpr</span><span class="w"> </span><span class="n">O</span>
<span class="w"> </span><span class="n">fill</span><span class="p">(</span><span class="n">O</span><span class="w"> </span><span class="n">first</span><span class="p">,</span><span class="w"> </span><span class="n">S</span><span class="w"> </span><span class="n">last</span><span class="p">,</span><span class="w"> </span><span class="k">const</span><span class="w"> </span><span class="n">T</span><span class="o">&</span><span class="w"> </span><span class="n">value</span><span class="p">);</span><span class="w"> </span><span class="c1">// (1) C++20</span>
<span class="w"> </span><span class="k">template</span><span class="w"> </span><span class="o"><</span><span class="k">class</span><span class="w"> </span><span class="nc">O</span><span class="p">,</span>
<span class="w"> </span><span class="n"><a href="../iterator/sentinel_for.html">sentinel_for</a></span><span class="o"><</span><span class="n">O</span><span class="o">></span><span class="w"> </span><span class="n">S</span><span class="p">,</span>
<span class="w"> </span><span class="k">class</span><span class="w"> </span><span class="nc">T</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="n"><a href="../iterator/iter_value_t.html">iter_value_t</a></span><span class="o"><</span><span class="n">O</span><span class="o">>></span>
<span class="w"> </span><span class="k">requires</span><span class="w"> </span><span class="n"><a href="../iterator/output_iterator.html">output_iterator</a></span><span class="o"><</span><span class="n">O</span><span class="p">,</span><span class="w"> </span><span class="k">const</span><span class="w"> </span><span class="n">T</span><span class="o">&></span>
<span class="w"> </span><span class="k">constexpr</span><span class="w"> </span><span class="n">O</span>
<span class="w"> </span><span class="n">fill</span><span class="p">(</span><span class="n">O</span><span class="w"> </span><span class="n">first</span><span class="p">,</span><span class="w"> </span><span class="n">S</span><span class="w"> </span><span class="n">last</span><span class="p">,</span><span class="w"> </span><span class="k">const</span><span class="w"> </span><span class="n">T</span><span class="o">&</span><span class="w"> </span><span class="n">value</span><span class="p">);</span><span class="w"> </span><span class="c1">// (1) C++26</span>
<span class="w"> </span><span class="k">template</span><span class="w"> </span><span class="o"><</span><span class="k">class</span><span class="w"> </span><span class="nc">T</span><span class="p">,</span>
<span class="w"> </span><span class="n"><a href="../ranges/output_range.html">output_range</a></span><span class="o"><</span><span class="k">const</span><span class="w"> </span><span class="n">T</span><span class="o">&></span><span class="w"> </span><span class="n">R</span><span class="o">></span>
<span class="w"> </span><span class="k">constexpr</span><span class="w"> </span><span class="n"><a href="../ranges/borrowed_iterator_t.html">borrowed_iterator_t</a></span><span class="o"><</span><span class="n">R</span><span class="o">></span>
<span class="w"> </span><span class="n">fill</span><span class="p">(</span><span class="n">R</span><span class="o">&&</span><span class="w"> </span><span class="n">r</span><span class="p">,</span><span class="w"> </span><span class="k">const</span><span class="w"> </span><span class="n">T</span><span class="o">&</span><span class="w"> </span><span class="n">value</span><span class="p">);</span><span class="w"> </span><span class="c1">// (2) C++20</span>
<span class="w"> </span><span class="k">template</span><span class="w"> </span><span class="o"><</span><span class="k">class</span><span class="w"> </span><span class="nc">R</span><span class="p">,</span>
<span class="w"> </span><span class="k">class</span><span class="w"> </span><span class="nc">T</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="n"><a href="../ranges/range_value_t.html">range_value_t</a></span><span class="o"><</span><span class="n">R</span><span class="o">>></span>
<span class="w"> </span><span class="k">requires</span><span class="w"> </span><span class="n"><a href="../ranges/output_range.html">output_range</a></span><span class="o"><</span><span class="n">R</span><span class="p">,</span><span class="w"> </span><span class="k">const</span><span class="w"> </span><span class="n">T</span><span class="o">&></span>
<span class="w"> </span><span class="k">constexpr</span><span class="w"> </span><span class="n"><a href="../ranges/borrowed_iterator_t.html">borrowed_iterator_t</a></span><span class="o"><</span><span class="n">R</span><span class="o">></span>
<span class="w"> </span><span class="n">fill</span><span class="p">(</span><span class="n">R</span><span class="o">&&</span><span class="w"> </span><span class="n">r</span><span class="p">,</span><span class="w"> </span><span class="k">const</span><span class="w"> </span><span class="n">T</span><span class="o">&</span><span class="w"> </span><span class="n">value</span><span class="p">);</span><span class="w"> </span><span class="c1">// (2) C++26</span>
<span class="w"> </span><span class="k">template</span><span class="w"> </span><span class="o"><</span><span class="n"><a href="../execution/execution-policy.html">execution-policy</a></span><span class="w"> </span><span class="n">Ep</span><span class="p">,</span>
<span class="w"> </span><span class="n"><a href="../iterator/random_access_iterator.html">random_access_iterator</a></span><span class="w"> </span><span class="n">O</span><span class="p">,</span>
<span class="w"> </span><span class="n"><a href="../iterator/sized_sentinel_for.html">sized_sentinel_for</a></span><span class="o"><</span><span class="n">O</span><span class="o">></span><span class="w"> </span><span class="n">S</span><span class="p">,</span>
<span class="w"> </span><span class="k">class</span><span class="w"> </span><span class="nc">T</span><span class="o">></span>
<span class="w"> </span><span class="k">requires</span><span class="w"> </span><span class="n"><a href="../iterator/indirectly_writable.html">indirectly_writable</a></span><span class="o"><</span><span class="n">O</span><span class="p">,</span><span class="w"> </span><span class="k">const</span><span class="w"> </span><span class="n">T</span><span class="o">&></span>
<span class="w"> </span><span class="n">O</span><span class="w"> </span><span class="n">fill</span><span class="p">(</span><span class="n">Ep</span><span class="o">&&</span><span class="w"> </span><span class="n">exec</span><span class="p">,</span>
<span class="w"> </span><span class="n">O</span><span class="w"> </span><span class="n">first</span><span class="p">,</span>
<span class="w"> </span><span class="n">S</span><span class="w"> </span><span class="n">last</span><span class="p">,</span>
<span class="w"> </span><span class="k">const</span><span class="w"> </span><span class="n">T</span><span class="o">&</span><span class="w"> </span><span class="n">value</span><span class="p">);</span><span class="w"> </span><span class="c1">// (3) C++26</span>
<span class="w"> </span><span class="k">template</span><span class="w"> </span><span class="o"><</span><span class="n"><a href="../execution/execution-policy.html">execution-policy</a></span><span class="w"> </span><span class="n">Ep</span><span class="p">,</span>
<span class="w"> </span><span class="n"><a href="../ranges/sized-random-access-range.html">sized-random-access-range</a></span><span class="w"> </span><span class="n">R</span><span class="p">,</span>
<span class="w"> </span><span class="k">class</span><span class="w"> </span><span class="nc">T</span><span class="o">></span>
<span class="w"> </span><span class="k">requires</span><span class="w"> </span><span class="n"><a href="../iterator/indirectly_writable.html">indirectly_writable</a></span><span class="o"><</span><span class="n"><a href="../ranges/iterator_t.html">iterator_t</a></span><span class="o"><</span><span class="n">R</span><span class="o">></span><span class="p">,</span><span class="w"> </span><span class="k">const</span><span class="w"> </span><span class="n">T</span><span class="o">&></span>
<span class="w"> </span><span class="n"><a href="../ranges/borrowed_iterator_t.html">borrowed_iterator_t</a></span><span class="o"><</span><span class="n">R</span><span class="o">></span>
<span class="w"> </span><span class="n">fill</span><span class="p">(</span><span class="n">Ep</span><span class="o">&&</span><span class="w"> </span><span class="n">exec</span><span class="p">,</span>
<span class="w"> </span><span class="n">R</span><span class="o">&&</span><span class="w"> </span><span class="n">r</span><span class="p">,</span>
<span class="w"> </span><span class="k">const</span><span class="w"> </span><span class="n">T</span><span class="o">&</span><span class="w"> </span><span class="n">value</span><span class="p">);</span><span class="w"> </span><span class="c1">// (4) C++26</span>
<span class="p">}</span>
</code></pre></div>
</p>
<h2>概要</h2>
<p>指定された値で出力の範囲に書き込む。</p>
<ul>
<li>(1): <a class="cpprefjp-defined-word" data-desc="2つのイテレータで表現される半開区間を表す。C++20からイテレータと番兵で異なる型であっても指定可能になる">イテレータ範囲</a>を指定する</li>
<li>(2): Rangeを直接指定する</li>
<li>(3): (1)の並列アルゴリズム版。実行ポリシーを指定する</li>
<li>(4): (2)の並列アルゴリズム版。実行ポリシーを指定する</li>
</ul>
<h2>効果</h2>
<p><code>[first,last)</code> 内の全ての要素に <code>value</code> を代入する</p>
<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>
<p><code>last</code></p>
<h2><a class="cpprefjp-defined-word" data-desc="関数等の意味論を構成する要素の1つ。Complexity。関数が使うアルゴリズムの空間計算量・時間計算量">計算量</a></h2>
<p>正確に <code>last - first</code> 回の代入を行う</p>
<h2>備考</h2>
<ul>
<li>(1), (2) :<ul>
<li>C++26 : 引数として波カッコ初期化<code>{}</code>を受け付ける
<br />
<div class="codehilite"><pre><span></span><code><span class="n"><a href="../vector/vector.html">std::vector</a></span><span class="o"><</span><span class="n">T</span><span class="o">></span><span class="w"> </span><span class="n">v</span><span class="p">;</span>
<span class="n">std</span><span class="o">::</span><span class="n">ranges</span><span class="o">::</span><span class="n">fill</span><span class="p">(</span><span class="n">v</span><span class="p">,</span><span class="w"> </span><span class="p">{</span><span class="n">a</span><span class="p">,</span><span class="w"> </span><span class="n">b</span><span class="p">});</span>
</code></pre></div>
</li>
</ul>
</li>
</ul>
<h2>例</h2>
<h3>基本的な使い方</h3>
<p><div class="yata" id="0caa6bed7514c20ef4cdf66ddf137b77f02717c0"><div class="codehilite"><pre><span></span><code><span class="cp">#include <a href="../algorithm.html"><algorithm></a></span>
<span class="cp">#include <a href="../iostream.html"><iostream></a></span>
<span class="cp">#include <a href="../vector.html"><vector></a></span>
<span class="kt">int</span><span class="w"> </span><span class="nf">main</span><span class="p">()</span><span class="w"> </span><span class="p">{</span>
<span class="w"> </span><span class="n"><a href="../vector/vector.html">std::vector</a></span><span class="o"><</span><span class="kt">int</span><span class="o">></span><span class="w"> </span><span class="n">v</span><span class="p">(</span><span class="mi">5</span><span class="p">);</span>
<span class="w"> </span><span class="c1">// v を 3 の値で埋める</span>
<span class="w"> </span><span class="n"><span style="color:#ff0000">std::ranges::fill</span></span><span class="p">(</span><span class="n">v</span><span class="p">,</span><span class="w"> </span><span class="mi">3</span><span class="p">);</span>
<span class="w"> </span><span class="k">for</span><span class="w"> </span><span class="p">(</span><span class="kt">int</span><span class="w"> </span><span class="n">x</span><span class="w"> </span><span class="o">:</span><span class="w"> </span><span class="n">v</span><span class="p">)</span><span class="w"> </span><span class="p">{</span>
<span class="w"> </span><span class="n"><a href="../iostream/cout.html">std::cout</a></span><span class="w"> </span><span class="o"><<</span><span class="w"> </span><span class="n">x</span><span class="w"> </span><span class="o"><<</span><span class="w"> </span><span class="s">","</span><span class="p">;</span>
<span class="w"> </span><span class="p">}</span>
<span class="p">}</span>
</code></pre></div>
</div></p>
<h4>出力</h4>
<p><pre><code>3,3,3,3,3,
</code></pre></p>
<h3>波カッコ初期化を入力として使用する (C++26)</h3>
<p><div class="yata" id="56ae10ad572aa83e9aa91d2c49f64266f354d966"><div class="codehilite"><pre><span></span><code><span class="cp">#include <a href="../algorithm.html"><algorithm></a></span>
<span class="cp">#include <a href="../iostream.html"><iostream></a></span>
<span class="cp">#include <a href="../vector.html"><vector></a></span>
<span class="k">struct</span><span class="w"> </span><span class="nc">Point</span><span class="w"> </span><span class="p">{</span>
<span class="w"> </span><span class="kt">int</span><span class="w"> </span><span class="n">x</span><span class="p">;</span>
<span class="w"> </span><span class="kt">int</span><span class="w"> </span><span class="n">y</span><span class="p">;</span>
<span class="w"> </span><span class="kt">bool</span><span class="w"> </span><span class="k">operator</span><span class="o">==</span><span class="p">(</span><span class="k">const</span><span class="w"> </span><span class="n">Point</span><span class="o">&</span><span class="w"> </span><span class="n">other</span><span class="p">)</span><span class="w"> </span><span class="k">const</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="k">default</span><span class="p">;</span>
<span class="p">};</span>
<span class="kt">int</span><span class="w"> </span><span class="nf">main</span><span class="p">()</span><span class="w"> </span><span class="p">{</span>
<span class="w"> </span><span class="n"><a href="../vector/vector.html">std::vector</a></span><span class="o"><</span><span class="n">Point</span><span class="o">></span><span class="w"> </span><span class="n">v</span><span class="p">(</span><span class="mi">5</span><span class="p">);</span>
<span class="w"> </span><span class="n"><span style="color:#ff0000">std::ranges::fill</span></span><span class="p">(</span><span class="n"><a href="../vector/vector/begin.html">v.begin()</a></span><span class="p">,</span><span class="w"> </span><span class="n"><a href="../vector/vector/end.html">v.end()</a></span><span class="p">,</span><span class="w"> </span><span class="p">{</span><span class="mi">1</span><span class="p">,</span><span class="w"> </span><span class="mi">2</span><span class="p">});</span>
<span class="w"> </span><span class="k">for</span><span class="w"> </span><span class="p">(</span><span class="k">const</span><span class="w"> </span><span class="n">Point</span><span class="o">&</span><span class="w"> </span><span class="n">p</span><span class="w"> </span><span class="o">:</span><span class="w"> </span><span class="n">v</span><span class="p">)</span><span class="w"> </span><span class="p">{</span>
<span class="w"> </span><span class="n"><a href="../iostream/cout.html">std::cout</a></span><span class="w"> </span><span class="o"><<</span><span class="w"> </span><span class="n">p</span><span class="p">.</span><span class="n">x</span><span class="w"> </span><span class="o"><<</span><span class="w"> </span><span class="s">","</span><span class="w"> </span><span class="o"><<</span><span class="w"> </span><span class="n">p</span><span class="p">.</span><span class="n">y</span><span class="w"> </span><span class="o"><<</span><span class="w"> </span><span class="n"><a href="../ostream/endl.html">std::endl</a></span><span class="p">;</span>
<span class="w"> </span><span class="p">}</span>
<span class="p">}</span>
</code></pre></div>
</div></p>
<h4>出力</h4>
<p><pre><code>1,2
1,2
1,2
1,2
1,2
</code></pre></p>
<h3>並列アルゴリズムの例 (C++26)</h3>
<p><div class="yata" id="2a53021bdeca84bf11ebf77fdcda798c1ff652fa"><div class="codehilite"><pre><span></span><code><span class="cp">#include <a href="../algorithm.html"><algorithm></a></span>
<span class="cp">#include <a href="../iostream.html"><iostream></a></span>
<span class="cp">#include <a href="../vector.html"><vector></a></span>
<span class="cp">#include <a href="../execution.html"><execution></a></span>
<span class="kt">int</span><span class="w"> </span><span class="nf">main</span><span class="p">()</span><span class="w"> </span><span class="p">{</span>
<span class="w"> </span><span class="n"><a href="../vector/vector.html">std::vector</a></span><span class="o"><</span><span class="kt">int</span><span class="o">></span><span class="w"> </span><span class="n">v</span><span class="p">(</span><span class="mi">10</span><span class="p">);</span>
<span class="w"> </span><span class="c1">// 並列に全要素を42で埋める</span>
<span class="w"> </span><span class="n"><span style="color:#ff0000">std::ranges::fill</span></span><span class="p">(</span><span class="n"><a href="../execution/execution/execution_policy.html">std::execution::par</a></span><span class="p">,</span><span class="w"> </span><span class="n">v</span><span class="p">,</span><span class="w"> </span><span class="mi">42</span><span class="p">);</span>
<span class="w"> </span><span class="k">for</span><span class="w"> </span><span class="p">(</span><span class="kt">int</span><span class="w"> </span><span class="n">x</span><span class="w"> </span><span class="o">:</span><span class="w"> </span><span class="n">v</span><span class="p">)</span><span class="w"> </span><span class="p">{</span>
<span class="w"> </span><span class="n"><a href="../iostream/cout.html">std::cout</a></span><span class="w"> </span><span class="o"><<</span><span class="w"> </span><span class="n">x</span><span class="w"> </span><span class="o"><<</span><span class="w"> </span><span class="sc">' '</span><span class="p">;</span>
<span class="w"> </span><span class="p">}</span>
<span class="w"> </span><span class="n"><a href="../iostream/cout.html">std::cout</a></span><span class="w"> </span><span class="o"><<</span><span class="w"> </span><span class="n"><a href="../ostream/endl.html">std::endl</a></span><span class="p">;</span>
<span class="p">}</span>
</code></pre></div>
</div></p>
<h4>出力</h4>
<p><pre><code>42 42 42 42 42 42 42 42 42 42
</code></pre></p>
<h2>バージョン</h2>
<h3>言語</h3>
<ul>
<li>C++20</li>
</ul>
<h3>処理系</h3>
<ul>
<li><a href="../../implementation.html#clang">Clang</a>: ??</li>
<li><a href="../../implementation.html#gcc">GCC</a>: 10.1.0 <span aria-label="検証済" role="img" title="検証済">✅</span></li>
<li><a href="../../implementation.html#icc">ICC</a>: ??</li>
<li><a href="../../implementation.html#visual_cpp">Visual C++</a>: 2019 Update 10 <span aria-label="検証済" role="img" title="検証済">✅</span></li>
</ul>
<h2>参照</h2>
<ul>
<li><a href="https://timsong-cpp.github.io/cppwp/n4861/algorithms" target="_blank">N4861 25 Algorithms library</a></li>
<li><a href="https://open-std.org/jtc1/sc22/wg21/docs/papers/2024/p2248r8.html" target="_blank">P2248R8 Enabling list-initialization for algorithms</a><ul>
<li>C++26で波カッコ初期化 (リスト初期化) に対応した</li>
</ul>
</li>
<li><a href="https://open-std.org/jtc1/sc22/wg21/docs/papers/2025/p3179r9.html" target="_blank">P3179R9 C++ parallel range algorithms</a></li>
</ul></div>
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