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<div class="identifier-type">function template</div><div class="header"><memory></div><h1 itemprop="name"><span class="namespace" title="namespace std">std::</span><span class="class" title="class shared_ptr">shared_ptr::</span><span class="token">owner_before</span><span class="cpp cpp11" title="C++11で追加">(C++11)</span></h1>
<div itemprop="articleBody"><p><div class="codehilite"><pre><span></span><code><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">U</span><span class="o">></span>
<span class="kt">bool</span>
<span class="w"> </span><span class="n">owner_before</span><span class="p">(</span><span class="k">const</span><span class="w"> </span><span class="n">shared_ptr</span><span class="o"><</span><span class="n">U</span><span class="o">>&</span><span class="w"> </span><span class="n">b</span><span class="p">)</span><span class="w"> </span><span class="k">const</span><span class="p">;</span><span class="w"> </span><span class="c1">// (1) C++11</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">U</span><span class="o">></span>
<span class="kt">bool</span>
<span class="w"> </span><span class="n">owner_before</span><span class="p">(</span><span class="k">const</span><span class="w"> </span><span class="n">shared_ptr</span><span class="o"><</span><span class="n">U</span><span class="o">>&</span><span class="w"> </span><span class="n">b</span><span class="p">)</span><span class="w"> </span><span class="k">const</span><span class="w"> </span><span class="k">noexcept</span><span class="p">;</span><span class="w"> </span><span class="c1">// (1) C++17</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">U</span><span class="o">></span>
<span class="kt">bool</span>
<span class="w"> </span><span class="n">owner_before</span><span class="p">(</span><span class="k">const</span><span class="w"> </span><span class="n"><a href="../weak_ptr.html">weak_ptr</a></span><span class="o"><</span><span class="n">U</span><span class="o">>&</span><span class="w"> </span><span class="n">b</span><span class="p">)</span><span class="w"> </span><span class="k">const</span><span class="p">;</span><span class="w"> </span><span class="c1">// (2) C++11</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">U</span><span class="o">></span>
<span class="kt">bool</span>
<span class="w"> </span><span class="n">owner_before</span><span class="p">(</span><span class="k">const</span><span class="w"> </span><span class="n"><a href="../weak_ptr.html">weak_ptr</a></span><span class="o"><</span><span class="n">U</span><span class="o">>&</span><span class="w"> </span><span class="n">b</span><span class="p">)</span><span class="w"> </span><span class="k">const</span><span class="w"> </span><span class="k">noexcept</span><span class="p">;</span><span class="w"> </span><span class="c1">// (2) C++17</span>
</code></pre></div>
</p>
<h2>概要</h2>
<p>所有権ベースでの小なり比較を行う。</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>*this</code>が持つリソースと、<code>b</code>が持つリソースを、所有権ベースで小なり比較し、<code>*this</code>が小さければ<code>true</code>、そうでなければ<code>false</code>を返す。</p>
<h2>備考</h2>
<p><code>shared_ptr</code>において、<code>a < b</code>は以下の動作となる:</p>
<p><div class="codehilite"><pre><span></span><code><span class="n">shared_ptr</span><span class="o"><</span><span class="n">T</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="p">...;</span>
<span class="n">shared_ptr</span><span class="o"><</span><span class="n">T</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="p">...;</span>
<span class="k">if</span><span class="w"> </span><span class="p">(</span><span class="n">a</span><span class="p">.</span><span class="n">get</span><span class="p">()</span><span class="w"> </span><span class="o"><</span><span class="w"> </span><span class="n">b</span><span class="p">.</span><span class="n">get</span><span class="p">())</span><span class="w"> </span><span class="p">{}</span>
</code></pre></div>
</p>
<p>このような、<code>shared_ptr</code>が保持するポインタの比較を、「値ベース(value-based)な比較」と言う。</p>
<p>この比較に依存して<code>shared_ptr</code>を<code><a href="../../set/set.html">std::set</a></code>や<code><a href="../../map/map.html">std::map</a></code>の要素型とすると、問題が起こることがある。<code>shared_ptr</code>には、別名コンストラクタ(aliasing constructor)と呼ばれる、以下の<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>がある:</p>
<p><div class="codehilite"><pre><span></span><code><span class="k">template</span><span class="o"><</span><span class="k">class</span><span class="w"> </span><span class="nc">Y</span><span class="o">></span>
<span class="n">shared_ptr</span><span class="p">(</span><span class="k">const</span><span class="w"> </span><span class="n">shared_ptr</span><span class="o"><</span><span class="n">Y</span><span class="o">>&</span><span class="w"> </span><span class="n">r</span><span class="p">,</span><span class="w"> </span><span class="n">T</span><span class="o">*</span><span class="w"> </span><span class="n">p</span><span class="p">)</span><span class="w"> </span><span class="k">noexcept</span><span class="p">;</span>
</code></pre></div>
</p>
<p>このコンストラクタを使用すると、所有するリソースは<code>r</code>だが、保持するポインタは<code>p</code>という状況が発生する。そのため、<code>std::set<std::shared_ptr<T>></code>を使用する場合に、同じリソースが重複登録されることがある。</p>
<p><code>owner_before()</code>は、たとえ別名コンストラクタが使われたとしても、所有するリソースのポインタ比較を行う。この比較方法を、「所有権ベース(ownership-based)な比較」と言う。</p>
<p>技術的には、<code>shared_ptr</code>が内部でメモリ確保している、参照カウンタオブジェクトのポインタ比較を行う。</p>
<h2>例</h2>
<p><div class="yata" id="9dcca44ca4cf24a1f819b5a8130bcb431a831d88"><div class="codehilite"><pre><span></span><code><span class="cp">#include <a href="../../iostream.html"><iostream></a></span>
<span class="cp">#include <a href="../../memory.html"><memory></a></span>
<span class="k">struct</span><span class="w"> </span><span class="nc">X</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">i</span><span class="p">;</span>
<span class="w"> </span><span class="kt">int</span><span class="w"> </span><span class="n">j</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="p">{</span>
<span class="w"> </span><span class="n"><a href="../shared_ptr.html">std::shared_ptr</a></span><span class="o"><</span><span class="n">X</span><span class="o">></span><span class="w"> </span><span class="n">org</span><span class="p">(</span><span class="k">new</span><span class="w"> </span><span class="n">X</span><span class="p">());</span>
<span class="w"> </span><span class="n"><a href="../shared_ptr.html">std::shared_ptr</a></span><span class="o"><</span><span class="kt">int</span><span class="o">></span><span class="w"> </span><span class="n">a</span><span class="p">(</span><span class="n">org</span><span class="p">,</span><span class="w"> </span><span class="o">&</span><span class="p">(</span><span class="n">org</span><span class="o">-></span><span class="n">i</span><span class="p">));</span>
<span class="w"> </span><span class="n"><a href="../shared_ptr.html">std::shared_ptr</a></span><span class="o"><</span><span class="kt">int</span><span class="o">></span><span class="w"> </span><span class="n">b</span><span class="p">(</span><span class="n">org</span><span class="p">,</span><span class="w"> </span><span class="o">&</span><span class="p">(</span><span class="n">org</span><span class="o">-></span><span class="n">j</span><span class="p">));</span>
<span class="w"> </span><span class="kt">bool</span><span class="w"> </span><span class="n">value_based_result</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="kt">bool</span><span class="w"> </span><span class="n">ownership_based_result</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="n">a</span><span class="p">.</span><span class="n"><span style="color:#ff0000">owner_before</span></span><span class="p">(</span><span class="n">b</span><span class="p">);</span><span class="w"> </span><span class="c1">// a and b are equivalent</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="../../ios/boolalpha.html">std::boolalpha</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">value_based_result</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">ownership_based_result</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>
<h3>出力</h3>
<p><pre><code>true
false
</code></pre></p>
<h2>バージョン</h2>
<h3>言語</h3>
<ul>
<li>C++11</li>
</ul>
<h3>処理系</h3>
<ul>
<li><a href="../../../implementation.html#gcc">GCC</a>: 4.4.7 <span aria-label="検証済" role="img" title="検証済">✅</span></li>
<li><a href="../../../implementation.html#clang">Clang</a>: 3.0 <span aria-label="検証済" role="img" title="検証済">✅</span></li>
<li><a href="../../../implementation.html#visual_cpp">Visual C++</a>: 2010 <span aria-label="検証済" role="img" title="検証済">✅</span>, 2012 <span aria-label="検証済" role="img" title="検証済">✅</span>, 2013 <span aria-label="検証済" role="img" title="検証済">✅</span></li>
</ul>
<h2>関連項目</h2>
<ul>
<li><code><a href="../owner_less.html">owner_less</a></code></li>
</ul>
<h2>参照</h2>
<ul>
<li><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2004/n1590.html" target="_blank">N1590 Smart Pointer Comparison Operators</a></li>
<li><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2008/n2637.pdf" target="_blank">N2637 Revisiting std::shared_ptr comparison</a></li>
<li><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/lwg-active.html#1406" target="_blank">LWG Issue 1406. Support hashing smart-pointers based on owner</a></li>
<li><a href="https://wg21.cmeerw.net/lwg/issue2873" target="_blank">LWG Issue 2873. Add <code>noexcept</code> to several <code>shared_ptr</code> related functions</a></li>
<li><a href="https://open-std.org/jtc1/sc22/wg21/docs/papers/2025/p3037r6.pdf" target="_blank">P3037R6 <code>constexpr std::shared_ptr</code> and friends</a></li>
<li><a href="https://cplusplus.github.io/LWG/issue4557" target="_blank">LWG Issue 4557. Remove <code>constexpr</code> from <code>owner_less</code> and <code>owner_before</code></a><ul>
<li>C++26で、P3037R6により一旦付与された<code>constexpr</code>指定が取り消され、<code>owner_before</code>と<code>owner_less</code>の<code>operator()</code>は<code>constexpr</code>ではなくなった</li>
</ul>
</li>
</ul></div>
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