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- <div class="section" id="indirect">
- <h1>indirect<a class="headerlink" href="#indirect" title="Permalink to this headline">¶</a></h1>
- <div class="section" id="header">
- <h2>Header<a class="headerlink" href="#header" title="Permalink to this headline">¶</a></h2>
- <div class="highlight-cpp"><div class="highlight"><pre><span class="cp">#include</span> <span class="cpf"><boost/hof/indirect.hpp></span><span class="cp"></span>
- </pre></div>
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- <div class="section" id="description">
- <h2>Description<a class="headerlink" href="#description" title="Permalink to this headline">¶</a></h2>
- <p>The <code class="docutils literal"><span class="pre">indirect</span></code> function adaptor dereferences the object before calling it.</p>
- </div>
- <div class="section" id="synopsis">
- <h2>Synopsis<a class="headerlink" href="#synopsis" title="Permalink to this headline">¶</a></h2>
- <div class="highlight-cpp"><div class="highlight"><pre><span class="k">template</span><span class="o"><</span><span class="k">class</span> <span class="nc">F</span><span class="o">></span>
- <span class="k">constexpr</span> <span class="n">indirect_adaptor</span><span class="o"><</span><span class="n">F</span><span class="o">></span> <span class="n">indirect</span><span class="p">(</span><span class="n">F</span> <span class="n">f</span><span class="p">);</span>
- </pre></div>
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- </div>
- <div class="section" id="semantics">
- <h2>Semantics<a class="headerlink" href="#semantics" title="Permalink to this headline">¶</a></h2>
- <div class="highlight-cpp"><div class="highlight"><pre><span class="n">assert</span><span class="p">(</span><span class="n">indirect</span><span class="p">(</span><span class="n">f</span><span class="p">)(</span><span class="n">xs</span><span class="p">...)</span> <span class="o">==</span> <span class="p">(</span><span class="o">*</span><span class="n">f</span><span class="p">)(</span><span class="n">xs</span><span class="p">...));</span>
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- <div class="section" id="requirements">
- <h2>Requirements<a class="headerlink" href="#requirements" title="Permalink to this headline">¶</a></h2>
- <p>F must be:</p>
- <ul class="simple">
- <li>MoveConstructible</li>
- <li>Dereferenceable</li>
- </ul>
- </div>
- <div class="section" id="example">
- <h2>Example<a class="headerlink" href="#example" title="Permalink to this headline">¶</a></h2>
- <div class="highlight-cpp"><div class="highlight"><pre><span class="cp">#include</span> <span class="cpf"><boost/hof.hpp></span><span class="cp"></span>
- <span class="cp">#include</span> <span class="cpf"><cassert></span><span class="cp"></span>
- <span class="cp">#include</span> <span class="cpf"><memory></span><span class="cp"></span>
- <span class="k">using</span> <span class="k">namespace</span> <span class="n">boost</span><span class="o">::</span><span class="n">hof</span><span class="p">;</span>
- <span class="k">struct</span> <span class="n">sum</span>
- <span class="p">{</span>
- <span class="k">template</span><span class="o"><</span><span class="k">class</span> <span class="nc">T</span><span class="p">,</span> <span class="k">class</span> <span class="nc">U</span><span class="o">></span>
- <span class="n">T</span> <span class="k">operator</span><span class="p">()(</span><span class="n">T</span> <span class="n">x</span><span class="p">,</span> <span class="n">U</span> <span class="n">y</span><span class="p">)</span> <span class="k">const</span>
- <span class="p">{</span>
- <span class="k">return</span> <span class="n">x</span><span class="o">+</span><span class="n">y</span><span class="p">;</span>
- <span class="p">}</span>
- <span class="p">};</span>
- <span class="kt">int</span> <span class="nf">main</span><span class="p">()</span> <span class="p">{</span>
- <span class="kt">int</span> <span class="n">r</span> <span class="o">=</span> <span class="n">indirect</span><span class="p">(</span><span class="n">std</span><span class="o">::</span><span class="n">make_unique</span><span class="o"><</span><span class="n">sum</span><span class="o">></span><span class="p">())(</span><span class="mi">3</span><span class="p">,</span><span class="mi">2</span><span class="p">);</span>
- <span class="n">assert</span><span class="p">(</span><span class="n">r</span> <span class="o">==</span> <span class="mi">5</span><span class="p">);</span>
- <span class="p">}</span>
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