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<div class="identifier-type">function template</div><div class="header"><string></div><h1 itemprop="name"><span class="namespace" title="namespace std">std::</span><span class="token">operator>></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="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">CharT</span><span class="p">,</span><span class="w"> </span><span class="k">class</span><span class="w"> </span><span class="nc">Traits</span><span class="p">,</span><span class="w"> </span><span class="k">class</span><span class="w"> </span><span class="nc">Allocator</span><span class="o">></span>
<span class="w"> </span><span class="n"><a href="../../istream/basic_istream.html">std::basic_istream</a></span><span class="o"><</span><span class="n">CharT</span><span class="p">,</span><span class="w"> </span><span class="n">Traits</span><span class="o">>&</span>
<span class="w"> </span><span class="k">operator</span><span class="o">>></span><span class="p">(</span><span class="n"><a href="../../istream/basic_istream.html">std::basic_istream</a></span><span class="o"><</span><span class="n">CharT</span><span class="p">,</span><span class="w"> </span><span class="n">Traits</span><span class="o">>&</span><span class="w"> </span><span class="n">is</span><span class="p">,</span>
<span class="w"> </span><span class="n">basic_string</span><span class="o"><</span><span class="n">CharT</span><span class="p">,</span><span class="w"> </span><span class="n">Traits</span><span class="p">,</span><span class="w"> </span><span class="n">Allocator</span><span class="o">>&</span><span class="w"> </span><span class="n">str</span><span class="p">);</span>
<span class="p">}</span>
</code></pre></div>
</p>
<h2>概要</h2>
<p>文字列をストリームから入力する。空白文字が現れるまで、あるいは<code>setw</code>マニピュレータで指定された数までの文字列を入力する。</p>
<p>この関数は、書式化入力関数（<code><a href="../../istream/basic_istream.html">basic_istream</a></code>を参照）として作用する。</p>
<h2>効果</h2>
<ol>
<li><code><a href="../../istream/basic_istream/sentry.html">basic_istream<>::sentry</a></code>オブジェクトを構築する。<code>sentry</code>オブジェクトが失敗を示した場合、何もしない。</li>
<li><code>str.erase()</code>を呼び出す。</li>
<li>以下のいずれかを満たすまで、文字を入力して<code>str.append(1, c)</code>と等価な方法で文字列に追加する。なお、<code>c</code>は入力した文字を表す。<ul>
<li>最大文字数まで書き込んだ。最大文字数は次のいずれかである。<ul>
<li><code>is.width()</code>が<code>0</code>以上ならその値とする。</li>
<li>さもなくば、<code>str.max_size()</code>とする。</li>
</ul>
</li>
<li>EOFに達した。</li>
<li>空白文字に達した。空白文字の判定にはストリームに設定されているロケールが考慮される。</li>
</ul>
</li>
<li><code>is.width(0)</code>を呼び出す。</li>
</ol>
<p>1文字も入力が行われなかった場合、ローカルエラー状態に<code>ios_base::failbit</code>を設定する。</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>
<ul>
<li>仮引数<code>is</code>。</li>
</ul>
<h2>例</h2>
<p><div class="yata" id="c182bf5ea2508766b043e390d9f4d3107151f99b"><div class="codehilite"><pre><span></span><code><span class="cp">#include <a href="../../iostream.html"><iostream></a></span>
<span class="cp">#include <a href="../../string.html"><string></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="../basic_string.html">std::string</a></span><span class="w"> </span><span class="n">a</span><span class="p">,</span><span class="w"> </span><span class="n">b</span><span class="p">;</span>
<span class="w"> </span><span class="k">if</span><span class="w"> </span><span class="p">(</span><span class="n"><a href="../../iostream/cin.html">std::cin</a></span><span class="w"> </span><span class="o">>></span><span class="w"> </span><span class="n">a</span><span class="w"> </span><span class="o">>></span><span class="w"> </span><span class="n">b</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</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="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">b</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>
<h3>入力</h3>
<p><pre><code>Apple Banana
</code></pre></p>
<h3>出力</h3>
<p><pre><code>Apple
Banana
</code></pre></p>
<h2>参照</h2>
<ul>
<li><code><a href="getline.html">getline</a></code>: このほかの<code>basic_string</code>に対する入力関数。</li>
<li>このほかの<code>>></code>演算子関数<ul>
<li><a href="../../istream/basic_istream/op_istream.html"><code><istream></code>ヘッダで定義されているもの</a></li>
</ul>
</li>
<li><a href="https://www.open-std.org/jtc1/sc22/wg21/docs/papers/2022/p1264r2.pdf" target="_blank">P1264R2 Revising the wording of stream input operations</a><ul>
<li>C++23でローカルエラー状態の概念が導入され、入力関数のエラー処理セマンティクスが明確化された</li>
</ul>
</li>
</ul></div>
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