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Sprout/docs/libs/string/basic_string/at.html
Bolero-MURAKAMI 2b0aaf71b4 support SPROUT_CXX14_CONSTEXPR
2013-11-04 14:31:03 +09:00

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<div class="section" id="at">
<h1>at<a class="headerlink" href="#at" title="Permalink to this headline"></a></h1>
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<h2>Interface<a class="headerlink" href="#interface" title="Permalink to this headline"></a></h2>
<div class="highlight-c++"><div class="highlight"><pre><span class="n">SPROUT_CXX14_CONSTEXPR</span> <span class="n">reference</span> <span class="n">at</span><span class="p">(</span><span class="n">size_type</span> <span class="n">n</span><span class="p">);</span>
<span class="n">SPROUT_CONSTEXPR</span> <span class="n">const_reference</span> <span class="n">at</span><span class="p">(</span><span class="n">size_type</span> <span class="n">n</span><span class="p">)</span> <span class="k">const</span><span class="p">;</span>
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<div class="line">The element at the specified position in the string.</div>
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<div class="line">It throws std::out_of_range if n is out of bounds.</div>
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<div class="highlight-c++"><div class="highlight"><pre><span class="cp">#include &lt;sprout/string.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">string</span><span class="o">&lt;</span><span class="mi">8</span><span class="o">&gt;</span><span class="p">(</span><span class="s">&quot;homuhomu&quot;</span><span class="p">);</span>
<span class="n">static_assert</span><span class="p">(</span><span class="n">input</span><span class="p">.</span><span class="n">at</span><span class="p">(</span><span class="mi">4</span><span class="p">)</span> <span class="o">==</span> <span class="sc">&#39;h&#39;</span><span class="p">,</span> <span class="s">&quot;an element at position 5 is h.&quot;</span><span class="p">);</span>
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<h2>Complexity<a class="headerlink" href="#complexity" title="Permalink to this headline"></a></h2>
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<div class="line">Recursive function invocations in <em>O(1)</em> (constant) depth.</div>
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<div class="line"><tt class="docutils literal"><span class="pre">sprout/string/string.hpp</span></tt></div>
<div class="line">Convenience header: <tt class="docutils literal"><span class="pre">sprout/string.hpp</span></tt></div>
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