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<li><a class="reference internal" href="#">count_if</a><ul>
<li><a class="reference internal" href="#interface">Interface</a></li>
<li><a class="reference internal" href="#returns">Returns</a></li>
<li><a class="reference internal" href="#examples">Examples</a></li>
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<div class="section" id="count-if">
<h1>count_if<a class="headerlink" href="#count-if" title="Permalink to this headline"></a></h1>
<div class="section" id="interface">
<h2>Interface<a class="headerlink" href="#interface" title="Permalink to this headline"></a></h2>
<div class="highlight-c++"><div class="highlight"><pre><span class="k">template</span><span class="o">&lt;</span><span class="k">typename</span> <span class="n">InputIterator</span><span class="p">,</span> <span class="k">typename</span> <span class="n">Predicate</span><span class="o">&gt;</span>
<span class="kr">inline</span> <span class="n">SPROUT_CONSTEXPR</span> <span class="k">typename</span> <span class="n">std</span><span class="o">::</span><span class="n">iterator_traits</span><span class="o">&lt;</span><span class="n">InputIterator</span><span class="o">&gt;::</span><span class="n">difference_type</span>
<span class="n">count_if</span><span class="p">(</span><span class="n">InputIterator</span> <span class="n">first</span><span class="p">,</span> <span class="n">InputIterator</span> <span class="n">last</span><span class="p">,</span> <span class="n">Predicate</span> <span class="n">pred</span><span class="p">);</span>
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<h2>Returns<a class="headerlink" href="#returns" title="Permalink to this headline"></a></h2>
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<div class="line">The number of iterators i in the range [first,last) for which the following corresponding conditions hold: <tt class="docutils literal"><span class="pre">pred(*i)</span></tt>.</div>
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<h2>Examples<a class="headerlink" href="#examples" title="Permalink to this headline"></a></h2>
<div class="highlight-c++"><div class="highlight"><pre><span class="cp">#include &lt;sprout/algorithm/count_if.hpp&gt;</span>
<span class="cp">#include &lt;sprout/array.hpp&gt;</span>
<span class="cp">#include &lt;sprout/container.hpp&gt;</span>
<span class="cp">#include &lt;sprout/functional.hpp&gt;</span>
<span class="k">using</span> <span class="k">namespace</span> <span class="n">sprout</span><span class="p">;</span>
<span class="n">SPROUT_STATIC_CONSTEXPR</span> <span class="k">auto</span> <span class="n">input</span> <span class="o">=</span> <span class="n">array</span><span class="o">&lt;</span><span class="kt">int</span><span class="p">,</span> <span class="mi">10</span><span class="o">&gt;</span><span class="p">{{</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">5</span><span class="p">,</span> <span class="mi">6</span><span class="p">,</span> <span class="mi">7</span><span class="p">,</span> <span class="mi">8</span><span class="p">,</span> <span class="mi">9</span><span class="p">,</span> <span class="mi">10</span><span class="p">}};</span>
<span class="n">SPROUT_STATIC_CONSTEXPR</span> <span class="k">auto</span> <span class="n">result</span> <span class="o">=</span> <span class="n">sprout</span><span class="o">::</span><span class="n">count_if</span><span class="p">(</span><span class="n">begin</span><span class="p">(</span><span class="n">input</span><span class="p">),</span> <span class="n">end</span><span class="p">(</span><span class="n">input</span><span class="p">),</span> <span class="n">bind2nd</span><span class="p">(</span><span class="n">modulus</span><span class="o">&lt;&gt;</span><span class="p">(),</span> <span class="mi">2</span><span class="p">));</span>
<span class="n">static_assert</span><span class="p">(</span><span class="n">result</span> <span class="o">==</span> <span class="mi">5</span><span class="p">,</span> <span class="s">&quot;counted 5 elements of odd number from input.&quot;</span><span class="p">);</span>
</pre></div>
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<div class="section" id="complexity">
<h2>Complexity<a class="headerlink" href="#complexity" title="Permalink to this headline"></a></h2>
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<div class="line">Exactly <tt class="docutils literal"><span class="pre">last</span> <span class="pre">-</span> <span class="pre">first</span></tt> applications of the predicate.</div>
<div class="line">Recursive function invocations in <em>O(logN)</em> (logarithmic) depth.</div>
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<h2>Header<a class="headerlink" href="#header" title="Permalink to this headline"></a></h2>
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<div class="line"><tt class="docutils literal"><span class="pre">sprout/algorithm/count_if.hpp</span></tt></div>
<div class="line">Convenience header: <tt class="docutils literal"><span class="pre">sprout/algorithm.hpp</span></tt></div>
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