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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">std::</span><span class="token">equal</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">InputIterator1</span><span class="p">,</span><span class="w"> </span><span class="k">class</span><span class="w"> </span><span class="nc">InputIterator2</span><span class="o">></span>
<span class="w"> </span><span class="kt">bool</span><span class="w"> </span><span class="n">equal</span><span class="p">(</span><span class="n">InputIterator1</span><span class="w"> </span><span class="n">first1</span><span class="p">,</span>
<span class="w"> </span><span class="n">InputIterator1</span><span class="w"> </span><span class="n">last1</span><span class="p">,</span>
<span class="w"> </span><span class="n">InputIterator2</span><span class="w"> </span><span class="n">first2</span><span class="p">);</span><span class="w"> </span><span class="c1">// (1) C++03</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">InputIterator1</span><span class="p">,</span><span class="w"> </span><span class="k">class</span><span class="w"> </span><span class="nc">InputIterator2</span><span class="o">></span>
<span class="w"> </span><span class="k">constexpr</span><span class="w"> </span><span class="kt">bool</span><span class="w"> </span><span class="n">equal</span><span class="p">(</span><span class="n">InputIterator1</span><span class="w"> </span><span class="n">first1</span><span class="p">,</span>
<span class="w"> </span><span class="n">InputIterator1</span><span class="w"> </span><span class="n">last1</span><span class="p">,</span>
<span class="w"> </span><span class="n">InputIterator2</span><span class="w"> </span><span class="n">first2</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">InputIterator1</span><span class="p">,</span><span class="w"> </span><span class="k">class</span><span class="w"> </span><span class="nc">InputIterator2</span><span class="p">,</span><span class="w"> </span><span class="k">class</span><span class="w"> </span><span class="nc">BinaryPredicate</span><span class="o">></span>
<span class="w"> </span><span class="kt">bool</span><span class="w"> </span><span class="n">equal</span><span class="p">(</span><span class="n">InputIterator1</span><span class="w"> </span><span class="n">first1</span><span class="p">,</span>
<span class="w"> </span><span class="n">InputIterator1</span><span class="w"> </span><span class="n">last1</span><span class="p">,</span>
<span class="w"> </span><span class="n">InputIterator2</span><span class="w"> </span><span class="n">first2</span><span class="p">,</span>
<span class="w"> </span><span class="n">BinaryPredicate</span><span class="w"> </span><span class="n">pred</span><span class="p">);</span><span class="w"> </span><span class="c1">// (2) C++03</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">InputIterator1</span><span class="p">,</span><span class="w"> </span><span class="k">class</span><span class="w"> </span><span class="nc">InputIterator2</span><span class="p">,</span><span class="w"> </span><span class="k">class</span><span class="w"> </span><span class="nc">BinaryPredicate</span><span class="o">></span>
<span class="w"> </span><span class="k">constexpr</span><span class="w"> </span><span class="kt">bool</span><span class="w"> </span><span class="n">equal</span><span class="p">(</span><span class="n">InputIterator1</span><span class="w"> </span><span class="n">first1</span><span class="p">,</span>
<span class="w"> </span><span class="n">InputIterator1</span><span class="w"> </span><span class="n">last1</span><span class="p">,</span>
<span class="w"> </span><span class="n">InputIterator2</span><span class="w"> </span><span class="n">first2</span><span class="p">,</span>
<span class="w"> </span><span class="n">BinaryPredicate</span><span class="w"> </span><span class="n">pred</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">InputIterator1</span><span class="p">,</span><span class="w"> </span><span class="k">class</span><span class="w"> </span><span class="nc">InputIterator2</span><span class="o">></span>
<span class="w"> </span><span class="kt">bool</span><span class="w"> </span><span class="n">equal</span><span class="p">(</span><span class="n">InputIterator1</span><span class="w"> </span><span class="n">first1</span><span class="p">,</span>
<span class="w"> </span><span class="n">InputIterator1</span><span class="w"> </span><span class="n">last1</span><span class="p">,</span>
<span class="w"> </span><span class="n">InputIterator2</span><span class="w"> </span><span class="n">first2</span><span class="p">,</span>
<span class="w"> </span><span class="n">InputIterator2</span><span class="w"> </span><span class="n">last2</span><span class="p">);</span><span class="w"> </span><span class="c1">// (3) C++14</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">InputIterator1</span><span class="p">,</span><span class="w"> </span><span class="k">class</span><span class="w"> </span><span class="nc">InputIterator2</span><span class="o">></span>
<span class="w"> </span><span class="k">constexpr</span><span class="w"> </span><span class="kt">bool</span><span class="w"> </span><span class="n">equal</span><span class="p">(</span><span class="n">InputIterator1</span><span class="w"> </span><span class="n">first1</span><span class="p">,</span>
<span class="w"> </span><span class="n">InputIterator1</span><span class="w"> </span><span class="n">last1</span><span class="p">,</span>
<span class="w"> </span><span class="n">InputIterator2</span><span class="w"> </span><span class="n">first2</span><span class="p">,</span>
<span class="w"> </span><span class="n">InputIterator2</span><span class="w"> </span><span class="n">last2</span><span class="p">);</span><span class="w"> </span><span class="c1">// (3) 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">InputIterator1</span><span class="p">,</span><span class="w"> </span><span class="k">class</span><span class="w"> </span><span class="nc">InputIterator2</span><span class="p">,</span><span class="w"> </span><span class="k">class</span><span class="w"> </span><span class="nc">BinaryPredicate</span><span class="o">></span>
<span class="w"> </span><span class="kt">bool</span><span class="w"> </span><span class="n">equal</span><span class="p">(</span><span class="n">InputIterator1</span><span class="w"> </span><span class="n">first1</span><span class="p">,</span>
<span class="w"> </span><span class="n">InputIterator1</span><span class="w"> </span><span class="n">last1</span><span class="p">,</span>
<span class="w"> </span><span class="n">InputIterator2</span><span class="w"> </span><span class="n">first2</span><span class="p">,</span>
<span class="w"> </span><span class="n">InputIterator2</span><span class="w"> </span><span class="n">last2</span><span class="p">,</span>
<span class="w"> </span><span class="n">BinaryPredicate</span><span class="w"> </span><span class="n">pred</span><span class="p">);</span><span class="w"> </span><span class="c1">// (4) C++14</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">InputIterator1</span><span class="p">,</span><span class="w"> </span><span class="k">class</span><span class="w"> </span><span class="nc">InputIterator2</span><span class="p">,</span><span class="w"> </span><span class="k">class</span><span class="w"> </span><span class="nc">BinaryPredicate</span><span class="o">></span>
<span class="w"> </span><span class="k">constexpr</span><span class="w"> </span><span class="kt">bool</span><span class="w"> </span><span class="n">equal</span><span class="p">(</span><span class="n">InputIterator1</span><span class="w"> </span><span class="n">first1</span><span class="p">,</span>
<span class="w"> </span><span class="n">InputIterator1</span><span class="w"> </span><span class="n">last1</span><span class="p">,</span>
<span class="w"> </span><span class="n">InputIterator2</span><span class="w"> </span><span class="n">first2</span><span class="p">,</span>
<span class="w"> </span><span class="n">InputIterator2</span><span class="w"> </span><span class="n">last2</span><span class="p">,</span>
<span class="w"> </span><span class="n">BinaryPredicate</span><span class="w"> </span><span class="n">pred</span><span class="p">);</span><span class="w"> </span><span class="c1">// (4) 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"><a href="../execution/execution/execution_policy.html">ExecutionPolicy</a></span><span class="p">,</span><span class="w"> </span><span class="k">class</span><span class="w"> </span><span class="nc">ForwardIterator1</span><span class="p">,</span><span class="w"> </span><span class="k">class</span><span class="w"> </span><span class="nc">ForwardIterator2</span><span class="o">></span>
<span class="w"> </span><span class="kt">bool</span><span class="w"> </span><span class="n">equal</span><span class="p">(</span><span class="n"><a href="../execution/execution/execution_policy.html">ExecutionPolicy</a></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">ForwardIterator1</span><span class="w"> </span><span class="n">first1</span><span class="p">,</span>
<span class="w"> </span><span class="n">ForwardIterator1</span><span class="w"> </span><span class="n">last1</span><span class="p">,</span>
<span class="w"> </span><span class="n">ForwardIterator2</span><span class="w"> </span><span class="n">first2</span><span class="p">);</span><span class="w"> </span><span class="c1">// (5) C++17</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"><a href="../execution/execution/execution_policy.html">ExecutionPolicy</a></span><span class="p">,</span><span class="w"> </span><span class="k">class</span><span class="w"> </span><span class="nc">ForwardIterator1</span><span class="p">,</span><span class="w"> </span><span class="k">class</span><span class="w"> </span><span class="nc">ForwardIterator2</span><span class="p">,</span>
<span class="w"> </span><span class="k">class</span><span class="w"> </span><span class="nc">BinaryPredicate</span><span class="o">></span>
<span class="w"> </span><span class="kt">bool</span><span class="w"> </span><span class="n">equal</span><span class="p">(</span><span class="n"><a href="../execution/execution/execution_policy.html">ExecutionPolicy</a></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">ForwardIterator1</span><span class="w"> </span><span class="n">first1</span><span class="p">,</span>
<span class="w"> </span><span class="n">ForwardIterator1</span><span class="w"> </span><span class="n">last1</span><span class="p">,</span>
<span class="w"> </span><span class="n">ForwardIterator2</span><span class="w"> </span><span class="n">first2</span><span class="p">,</span>
<span class="w"> </span><span class="n">BinaryPredicate</span><span class="w"> </span><span class="n">pred</span><span class="p">);</span><span class="w"> </span><span class="c1">// (6) C++17</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"><a href="../execution/execution/execution_policy.html">ExecutionPolicy</a></span><span class="p">,</span><span class="w"> </span><span class="k">class</span><span class="w"> </span><span class="nc">ForwardIterator1</span><span class="p">,</span><span class="w"> </span><span class="k">class</span><span class="w"> </span><span class="nc">ForwardIterator2</span><span class="o">></span>
<span class="w"> </span><span class="kt">bool</span><span class="w"> </span><span class="n">equal</span><span class="p">(</span><span class="n"><a href="../execution/execution/execution_policy.html">ExecutionPolicy</a></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">ForwardIterator1</span><span class="w"> </span><span class="n">first1</span><span class="p">,</span>
<span class="w"> </span><span class="n">ForwardIterator1</span><span class="w"> </span><span class="n">last1</span><span class="p">,</span>
<span class="w"> </span><span class="n">ForwardIterator2</span><span class="w"> </span><span class="n">first2</span><span class="p">,</span>
<span class="w"> </span><span class="n">ForwardIterator2</span><span class="w"> </span><span class="n">last2</span><span class="p">);</span><span class="w"> </span><span class="c1">// (7) C++17</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"><a href="../execution/execution/execution_policy.html">ExecutionPolicy</a></span><span class="p">,</span><span class="w"> </span><span class="k">class</span><span class="w"> </span><span class="nc">ForwardIterator1</span><span class="p">,</span><span class="w"> </span><span class="k">class</span><span class="w"> </span><span class="nc">ForwardIterator2</span><span class="p">,</span>
<span class="w"> </span><span class="k">class</span><span class="w"> </span><span class="nc">BinaryPredicate</span><span class="o">></span>
<span class="w"> </span><span class="kt">bool</span><span class="w"> </span><span class="n">equal</span><span class="p">(</span><span class="n"><a href="../execution/execution/execution_policy.html">ExecutionPolicy</a></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">ForwardIterator1</span><span class="w"> </span><span class="n">first1</span><span class="p">,</span>
<span class="w"> </span><span class="n">ForwardIterator1</span><span class="w"> </span><span class="n">last1</span><span class="p">,</span>
<span class="w"> </span><span class="n">ForwardIterator2</span><span class="w"> </span><span class="n">first2</span><span class="p">,</span>
<span class="w"> </span><span class="n">ForwardIterator2</span><span class="w"> </span><span class="n">last2</span><span class="p">,</span>
<span class="w"> </span><span class="n">BinaryPredicate</span><span class="w"> </span><span class="n">pred</span><span class="p">);</span><span class="w"> </span><span class="c1">// (8) C++17</span>
<span class="p">}</span>
</code></pre></div>
</p>
<h2>概要</h2>
<p>2つの<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>を等値比較する。</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><code>[first1, last1)</code>と<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><code>[first2, first2 + (last1 - first1))</code>が等値かを判定する</li>
<li>(2) : (1)の等値比較を任意の2引数関数オブジェクトで行う</li>
<li>(3) : <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><code>[first1, last1)</code>と<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><code>[first2, last2)</code>が等値かを判定する</li>
<li>(4) : (3)の等値比較を任意の2引数関数オブジェクトで行う</li>
</ul>
<p>2つの<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>が異なる要素数であった場合、<code>false</code>を返す。</p>
<p>2つの<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>が要素数および各要素が等値であった場合、<code>true</code>を返す。</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>last2</code> が与えられている形式の場合、もし <code>last1 - first1 != last2 - first2</code> であれば、<code>false</code> を返す。<br />
そうでない場合、<code>[first1,last1)</code> 内のイテレータ <code>i</code> について、<code>*i == *(first2 + (i - first1))</code> もしくは <code>pred(*i, *(first2 + (i - first1))) != false</code> が全てのイテレータ <code>i</code> について満たされているのであれば <code>true</code> を返す。<br />
そうでない場合は <code>false</code> を返す。</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><code>last2</code> が与えられていない形式では、<code>last2 = first2 + (last1 - first1)</code>であるとして説明する。</p>
<ul>
<li>(1), (2), (3), (4) : <code>InputIterator1</code> と <code>InputIterator2</code> が共にランダムアクセスイテレータの要件を満たす場合で、かつ、<code>last1 - first1 != last2 - first2</code> の場合、1 度も比較または<a class="cpprefjp-defined-word" data-desc="boolを返す関数・関数オブジェクト。predicate">述語</a>は適用されない。そうでない場合、最大で <code>min(last1 - first1, last2 - first2)</code> 回の比較または<a class="cpprefjp-defined-word" data-desc="boolを返す関数・関数オブジェクト。predicate">述語</a>が適用される。</li>
<li>(5), (6), (7), (8) : <code>ForwardIterator1</code> と <code>ForwardIterator2</code> が共にランダムアクセスイテレータの要件を満たす場合で、かつ、<code>last1 - first1 != last2 - first2</code> の場合、1 度も比較または<a class="cpprefjp-defined-word" data-desc="boolを返す関数・関数オブジェクト。predicate">述語</a>は適用されない。そうでない場合、O(<code>min(last1 - first1, last2 - first2)</code>) 回の比較または<a class="cpprefjp-defined-word" data-desc="boolを返す関数・関数オブジェクト。predicate">述語</a>が適用される。</li>
</ul>
<h2>備考</h2>
<ul>
<li>ランダムアクセスイテレータの範囲を使用する場合、状況によっては(1), (2)のバージョンよりも、(3), (4)を使用する方が効率がよくなることが期待できる。ランダムアクセスイテレータはイテレータ同士の差を定数時間で求められるため、イテレーションを行うことなく2つの範囲の要素数が異なることを検出できるためである</li>
</ul>
<h2>例</h2>
<p><div class="yata" id="e11448478d59a803eab835e51d930796d7df1b10"><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="../array.html"><array></a></span>
<span class="cp">#include <a href="../iterator.html"><iterator></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="w"> </span><span class="o">=</span><span class="w"> </span><span class="p">{</span><span class="w"> </span><span class="mi">1</span><span class="p">,</span><span class="mi">2</span><span class="p">,</span><span class="mi">3</span><span class="p">,</span><span class="mi">4</span><span class="p">,</span><span class="mi">3</span><span class="p">,</span><span class="mi">2</span><span class="w"> </span><span class="p">};</span>
<span class="w"> </span><span class="n"><a href="../array/array.html">std::array</a></span><span class="o"><</span><span class="kt">int</span><span class="p">,</span><span class="w"> </span><span class="mi">6</span><span class="o">></span><span class="w"> </span><span class="n">v2</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="p">{</span><span class="w"> </span><span class="mi">1</span><span class="p">,</span><span class="mi">2</span><span class="p">,</span><span class="mi">3</span><span class="p">,</span><span class="mi">4</span><span class="p">,</span><span class="mi">2</span><span class="p">,</span><span class="mi">1</span><span class="w"> </span><span class="p">};</span>
<span class="w"> </span><span class="c1">// コンテナの中身が同じかどうか調べる</span>
<span class="w"> </span><span class="kt">bool</span><span class="w"> </span><span class="n">result</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="n"><span style="color:#ff0000">std::equal</span></span><span class="p">(</span><span class="n"><a href="../iterator/begin.html">std::begin</a></span><span class="p">(</span><span class="n">v</span><span class="p">),</span><span class="w"> </span><span class="n"><a href="../iterator/end.html">std::end</a></span><span class="p">(</span><span class="n">v</span><span class="p">),</span><span class="w"> </span><span class="n"><a href="../iterator/begin.html">std::begin</a></span><span class="p">(</span><span class="n">v2</span><span class="p">),</span><span class="w"> </span><span class="n"><a href="../iterator/end.html">std::end</a></span><span class="p">(</span><span class="n">v2</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="../ios/boolalpha.html">std::boolalpha</a></span><span class="w"> </span><span class="o"><<</span><span class="w"> </span><span class="n">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="c1">// x±1 の誤差を許すようにする</span>
<span class="w"> </span><span class="kt">bool</span><span class="w"> </span><span class="n">result2</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="n"><span style="color:#ff0000">std::equal</span></span><span class="p">(</span><span class="n"><a href="../iterator/begin.html">std::begin</a></span><span class="p">(</span><span class="n">v</span><span class="p">),</span><span class="w"> </span><span class="n"><a href="../iterator/end.html">std::end</a></span><span class="p">(</span><span class="n">v</span><span class="p">),</span><span class="w"> </span><span class="n"><a href="../iterator/begin.html">std::begin</a></span><span class="p">(</span><span class="n">v2</span><span class="p">),</span><span class="w"> </span><span class="n"><a href="../iterator/end.html">std::end</a></span><span class="p">(</span><span class="n">v2</span><span class="p">),</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="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="p">{</span><span class="w"> </span><span class="k">return</span><span class="w"> </span><span class="n">x</span><span class="w"> </span><span class="o">-</span><span class="w"> </span><span class="mi">1</span><span class="w"> </span><span class="o"><=</span><span class="w"> </span><span class="n">y</span><span class="w"> </span><span class="o">&&</span><span class="w"> </span><span class="n">y</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="mi">1</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="../ios/boolalpha.html">std::boolalpha</a></span><span class="w"> </span><span class="o"><<</span><span class="w"> </span><span class="n">result2</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>false
true
</code></pre></p>
<h2>実装例</h2>
<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">InputIterator1</span><span class="p">,</span><span class="w"> </span><span class="k">class</span><span class="w"> </span><span class="nc">InputIterator2</span><span class="o">></span>
<span class="kt">bool</span><span class="w"> </span><span class="n">equal</span><span class="p">(</span><span class="n">InputIterator1</span><span class="w"> </span><span class="n">first1</span><span class="p">,</span><span class="w"> </span><span class="n">InputIterator1</span><span class="w"> </span><span class="n">last1</span><span class="p">,</span>
<span class="w"> </span><span class="n">InputIterator2</span><span class="w"> </span><span class="n">first2</span><span class="p">)</span><span class="w"> </span><span class="p">{</span>
<span class="w"> </span><span class="k">for</span><span class="w"> </span><span class="p">(</span><span class="w"> </span><span class="p">;</span><span class="w"> </span><span class="n">first1</span><span class="w"> </span><span class="o">!=</span><span class="w"> </span><span class="n">last1</span><span class="p">;</span><span class="w"> </span><span class="o">++</span><span class="n">first1</span><span class="p">,</span><span class="w"> </span><span class="o">++</span><span class="n">first2</span><span class="p">)</span>
<span class="w"> </span><span class="k">if</span><span class="w"> </span><span class="p">(</span><span class="o">!</span><span class="kt">bool</span><span class="p">(</span><span class="o">*</span><span class="n">first1</span><span class="w"> </span><span class="o">==</span><span class="w"> </span><span class="o">*</span><span class="n">first2</span><span class="p">))</span>
<span class="w"> </span><span class="k">return</span><span class="w"> </span><span class="nb">false</span><span class="p">;</span>
<span class="w"> </span><span class="k">return</span><span class="w"> </span><span class="nb">true</span><span class="p">;</span>
<span class="p">}</span>
<span class="k">template</span><span class="o"><</span><span class="k">class</span><span class="w"> </span><span class="nc">InputIterator1</span><span class="p">,</span><span class="w"> </span><span class="k">class</span><span class="w"> </span><span class="nc">InputIterator2</span><span class="p">,</span><span class="w"> </span><span class="k">class</span><span class="w"> </span><span class="nc">BinaryPredicate</span><span class="o">></span>
<span class="kt">bool</span><span class="w"> </span><span class="n">equal</span><span class="p">(</span><span class="n">InputIterator1</span><span class="w"> </span><span class="n">first1</span><span class="p">,</span><span class="w"> </span><span class="n">InputIterator1</span><span class="w"> </span><span class="n">last1</span><span class="p">,</span>
<span class="w"> </span><span class="n">InputIterator2</span><span class="w"> </span><span class="n">first2</span><span class="p">,</span><span class="w"> </span><span class="n">BinaryPredicate</span><span class="w"> </span><span class="n">pred</span><span class="p">)</span><span class="w"> </span><span class="p">{</span>
<span class="w"> </span><span class="k">for</span><span class="w"> </span><span class="p">(</span><span class="w"> </span><span class="p">;</span><span class="w"> </span><span class="n">first1</span><span class="w"> </span><span class="o">!=</span><span class="w"> </span><span class="n">last1</span><span class="p">;</span><span class="w"> </span><span class="o">++</span><span class="n">first1</span><span class="p">,</span><span class="w"> </span><span class="o">++</span><span class="n">first2</span><span class="p">)</span>
<span class="w"> </span><span class="k">if</span><span class="w"> </span><span class="p">(</span><span class="o">!</span><span class="kt">bool</span><span class="p">(</span><span class="n">pred</span><span class="p">(</span><span class="o">*</span><span class="n">first1</span><span class="p">,</span><span class="w"> </span><span class="o">*</span><span class="n">first2</span><span class="p">)))</span>
<span class="w"> </span><span class="k">return</span><span class="w"> </span><span class="nb">false</span><span class="p">;</span>
<span class="w"> </span><span class="k">return</span><span class="w"> </span><span class="nb">true</span><span class="p">;</span>
<span class="p">}</span>
<span class="cp">#if __cplusplus >= 201402L</span>
<span class="k">template</span><span class="o"><</span><span class="k">class</span><span class="w"> </span><span class="nc">RandomAccessIterator1</span><span class="p">,</span><span class="w"> </span><span class="k">class</span><span class="w"> </span><span class="nc">RandomAccessIterator2</span><span class="p">,</span><span class="w"> </span><span class="k">class</span><span class="w"> </span><span class="nc">BinaryPredicate</span><span class="o">></span>
<span class="kr">inline</span><span class="w"> </span><span class="kt">bool</span><span class="w"> </span><span class="n">equal_impl</span><span class="p">(</span><span class="n">RandomAccessIterator1</span><span class="w"> </span><span class="n">first1</span><span class="p">,</span><span class="w"> </span><span class="n">RandomAccessIterator1</span><span class="w"> </span><span class="n">last1</span><span class="p">,</span>
<span class="w"> </span><span class="n">RandomAccessIterator2</span><span class="w"> </span><span class="n">first2</span><span class="p">,</span><span class="w"> </span><span class="n">RandomAccessIterator2</span><span class="w"> </span><span class="n">last2</span><span class="p">,</span>
<span class="w"> </span><span class="n">BinaryPredicate</span><span class="w"> </span><span class="n">pred</span><span class="p">,</span>
<span class="w"> </span><span class="n">random_access_iterator_tag</span><span class="p">,</span><span class="w"> </span><span class="n">random_access_iterator_tag</span><span class="p">)</span><span class="w"> </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">last1</span><span class="w"> </span><span class="o">-</span><span class="w"> </span><span class="n">first1</span><span class="w"> </span><span class="o">!=</span><span class="w"> </span><span class="n">last2</span><span class="w"> </span><span class="o">-</span><span class="w"> </span><span class="n">first2</span><span class="p">)</span>
<span class="w"> </span><span class="k">return</span><span class="w"> </span><span class="nb">false</span><span class="p">;</span>
<span class="w"> </span><span class="k">return</span><span class="w"> </span><span class="n">std</span><span class="o">::</span><span class="n">equal</span><span class="p">(</span><span class="n">first1</span><span class="p">,</span><span class="w"> </span><span class="n">last1</span><span class="p">,</span><span class="w"> </span><span class="n">first2</span><span class="p">,</span><span class="w"> </span><span class="n">pred</span><span class="p">);</span>
<span class="p">}</span>
<span class="k">template</span><span class="o"><</span><span class="k">class</span><span class="w"> </span><span class="nc">InputIterator1</span><span class="p">,</span><span class="w"> </span><span class="k">class</span><span class="w"> </span><span class="nc">InputIterator2</span><span class="p">,</span><span class="w"> </span><span class="k">class</span><span class="w"> </span><span class="nc">BinaryPredicate</span><span class="o">></span>
<span class="kt">bool</span><span class="w"> </span><span class="n">equal_impl</span><span class="p">(</span><span class="n">InputIterator1</span><span class="w"> </span><span class="n">first1</span><span class="p">,</span><span class="w"> </span><span class="n">InputIterator1</span><span class="w"> </span><span class="n">last1</span><span class="p">,</span>
<span class="w"> </span><span class="n">InputIterator2</span><span class="w"> </span><span class="n">first2</span><span class="p">,</span><span class="w"> </span><span class="n">InputIterator2</span><span class="w"> </span><span class="n">last2</span><span class="p">,</span><span class="w"> </span><span class="n">BinaryPredicate</span><span class="w"> </span><span class="n">pred</span><span class="p">,</span>
<span class="w"> </span><span class="n">input_iterator_tag</span><span class="p">,</span><span class="w"> </span><span class="n">input_iterator_tag</span><span class="p">)</span><span class="w"> </span><span class="p">{</span>
<span class="w"> </span><span class="k">for</span><span class="w"> </span><span class="p">(</span><span class="w"> </span><span class="p">;</span><span class="w"> </span><span class="n">first1</span><span class="w"> </span><span class="o">!=</span><span class="w"> </span><span class="n">last1</span><span class="w"> </span><span class="o">&&</span><span class="w"> </span><span class="n">first2</span><span class="w"> </span><span class="o">!=</span><span class="w"> </span><span class="n">last2</span><span class="p">;</span><span class="w"> </span><span class="o">++</span><span class="n">first1</span><span class="p">,</span><span class="w"> </span><span class="o">++</span><span class="n">first2</span><span class="p">)</span>
<span class="w"> </span><span class="k">if</span><span class="w"> </span><span class="p">(</span><span class="o">!</span><span class="kt">bool</span><span class="p">(</span><span class="n">pred</span><span class="p">(</span><span class="o">*</span><span class="n">first1</span><span class="p">,</span><span class="w"> </span><span class="o">*</span><span class="n">first2</span><span class="p">)))</span>
<span class="w"> </span><span class="k">return</span><span class="w"> </span><span class="nb">false</span><span class="p">;</span>
<span class="w"> </span><span class="k">return</span><span class="w"> </span><span class="n">first1</span><span class="w"> </span><span class="o">==</span><span class="w"> </span><span class="n">last1</span><span class="w"> </span><span class="o">&&</span><span class="w"> </span><span class="n">first2</span><span class="w"> </span><span class="o">==</span><span class="w"> </span><span class="n">last2</span><span class="p">;</span>
<span class="p">}</span>
<span class="k">template</span><span class="o"><</span><span class="k">class</span><span class="w"> </span><span class="nc">InputIterator1</span><span class="p">,</span><span class="w"> </span><span class="k">class</span><span class="w"> </span><span class="nc">InputIterator2</span><span class="p">,</span><span class="w"> </span><span class="k">class</span><span class="w"> </span><span class="nc">BinaryPredicate</span><span class="o">></span>
<span class="kr">inline</span><span class="w"> </span><span class="kt">bool</span><span class="w"> </span><span class="n">equal</span><span class="p">(</span><span class="n">InputIterator1</span><span class="w"> </span><span class="n">first1</span><span class="p">,</span><span class="w"> </span><span class="n">InputIterator1</span><span class="w"> </span><span class="n">last1</span><span class="p">,</span>
<span class="w"> </span><span class="n">InputIterator2</span><span class="w"> </span><span class="n">first2</span><span class="p">,</span><span class="w"> </span><span class="n">InputIterator2</span><span class="w"> </span><span class="n">last2</span><span class="p">,</span><span class="w"> </span><span class="n">BinaryPredicate</span><span class="w"> </span><span class="n">pred</span><span class="p">)</span><span class="w"> </span><span class="p">{</span>
<span class="w"> </span><span class="k">return</span><span class="w"> </span><span class="n">equal_impl</span><span class="p">(</span><span class="n">first1</span><span class="p">,</span><span class="w"> </span><span class="n">last1</span><span class="p">,</span><span class="w"> </span><span class="n">first2</span><span class="p">,</span><span class="w"> </span><span class="n">last2</span><span class="p">,</span><span class="w"> </span><span class="n">pred</span><span class="p">,</span>
<span class="w"> </span><span class="k">typename</span><span class="w"> </span><span class="nc"><a href="../iterator/iterator_traits.html">iterator_traits</a></span><span class="o"><</span><span class="n">InputIterator1</span><span class="o">>::</span><span class="n">iterator_category</span><span class="p">(),</span>
<span class="w"> </span><span class="k">typename</span><span class="w"> </span><span class="nc"><a href="../iterator/iterator_traits.html">iterator_traits</a></span><span class="o"><</span><span class="n">InputIterator2</span><span class="o">>::</span><span class="n">iterator_category</span><span class="p">());</span>
<span class="p">}</span>
<span class="k">template</span><span class="o"><</span><span class="k">class</span><span class="w"> </span><span class="nc">InputIterator1</span><span class="p">,</span><span class="w"> </span><span class="k">class</span><span class="w"> </span><span class="nc">InputIterator2</span><span class="o">></span>
<span class="kr">inline</span><span class="w"> </span><span class="kt">bool</span><span class="w"> </span><span class="n">equal</span><span class="p">(</span><span class="n">InputIterator1</span><span class="w"> </span><span class="n">first1</span><span class="p">,</span><span class="w"> </span><span class="n">InputIterator1</span><span class="w"> </span><span class="n">last1</span><span class="p">,</span>
<span class="w"> </span><span class="n">InputIterator2</span><span class="w"> </span><span class="n">first2</span><span class="p">,</span><span class="w"> </span><span class="n">InputIterator2</span><span class="w"> </span><span class="n">last2</span><span class="p">)</span><span class="w"> </span><span class="p">{</span>
<span class="w"> </span><span class="k">return</span><span class="w"> </span><span class="n">std</span><span class="o">::</span><span class="n">equal</span><span class="p">(</span><span class="n">first1</span><span class="p">,</span><span class="w"> </span><span class="n">last1</span><span class="p">,</span><span class="w"> </span><span class="n">first2</span><span class="p">,</span><span class="w"> </span><span class="n">last2</span><span class="p">,</span><span class="w"> </span><span class="n"><a href="../functional/equal_to.html">equal_to</a></span><span class="o"><></span><span class="p">());</span>
<span class="p">}</span>
<span class="cp">#endif</span>
</code></pre></div>
</p>
<h2>バージョン</h2>
<h3>言語</h3>
<ul>
<li>C++98</li>
<li>C++14: 2つ目の終端のイテレータ<code>last2</code>を実引数に取る<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>の追加。</li>
</ul>
<h3>処理系(last2を受け取るバージョン)</h3>
<ul>
<li><a href="../../implementation.html#clang">Clang</a>: 3.4 <span aria-label="検証済" role="img" title="検証済">✅</span></li>
<li><a href="../../implementation.html#gcc">GCC</a>: 4.9 <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>: 2015 <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="ranges_equal.html">ranges::equal</a></code></li>
</ul>
<h2>参照</h2>
<ul>
<li><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2013/n3671.html" target="_blank">N3671 Making non-modifying sequence operations more robust: Revision 2</a><ul>
<li>C++14から追加された、<code>last2</code>を受け取る<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>の提案文書</li>
</ul>
</li>
<li><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2017/p0202r3.html" target="_blank">P0202R3 Add Constexpr Modifiers to Functions in <code><algorithm></code> and <code><utility></code> Headers</a></li>
<li><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2017/p0467r2.html" target="_blank">P0467R2 Iterator Concerns for Parallel Algorithms</a></li>
</ul></div>
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