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<title>The MPL Reference Manual: Lambda Expression</title>
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<table class="header"><tr class="header"><td class="header-group navigation-bar"><span class="navigation-group"><a href="./metafunction-class.html" class="navigation-link">Prev</a> <a href="./placeholder-expression.html" class="navigation-link">Next</a></span><span class="navigation-group-separator"> | </span><span class="navigation-group"><a href="./metafunction-class.html" class="navigation-link">Back</a> <a href="./placeholder-expression.html" class="navigation-link">Along</a></span><span class="navigation-group-separator"> | </span><span class="navigation-group"><a href="./metafunctions-concepts.html" class="navigation-link">Up</a> <a href="../refmanual.html" class="navigation-link">Home</a></span><span class="navigation-group-separator"> | </span><span class="navigation-group"><a href="./refmanual_toc.html" class="navigation-link">Full TOC</a></span></td>
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<td class="header-group page-location"><a href="../refmanual.html" class="navigation-link">Front Page</a> / <a href="./metafunctions.html" class="navigation-link">Metafunctions</a> / <a href="./metafunctions-concepts.html" class="navigation-link">Concepts</a> / <a href="./lambda-expression.html" class="navigation-link">Lambda Expression</a></td>
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<div class="section" id="lambda-expression">
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<h1><a class="toc-backref" href="./metafunctions-concepts.html#id440" name="lambda-expression">Lambda Expression</a></h1>
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<div class="section" id="lambda-description">
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<h3><a class="subsection-title" href="#description" name="description">Description</a></h3>
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<p>A <a class="reference" href="./lambda-expression.html">Lambda Expression</a> is a compile-time invocable entity in either of the following two
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forms:</p>
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<ul class="simple">
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<li><a class="reference" href="./metafunction-class.html">Metafunction Class</a></li>
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<li><a class="reference" href="./placeholder-expression.html">Placeholder Expression</a></li>
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</ul>
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<p>Most of the MPL components accept either of those, and the concept
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gives us a consice way to describe these requirements.</p>
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</div>
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<div class="section" id="lambda-expression-requirements">
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<h3><a class="subsection-title" href="#expression-requirements" name="expression-requirements">Expression requirements</a></h3>
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<p>See corresponding <a class="reference" href="./metafunction-class.html">Metafunction Class</a> and <a class="reference" href="./placeholder-expression.html">Placeholder Expression</a> specifications.</p>
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</div>
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<div class="section" id="lambda-models">
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<h3><a class="subsection-title" href="#models" name="models">Models</a></h3>
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<ul class="simple">
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<li><a class="refentry reference" href="./always.html"><tt class="refentry literal"><span class="pre">always</span></tt></a></li>
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<li><a class="refentry reference" href="./unpack-args.html"><tt class="refentry literal"><span class="pre">unpack_args</span></tt></a></li>
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<li><tt class="literal"><span class="pre"><a href="./plus.html" class="identifier">plus</a><_,</span> <span class="pre"><a href="./int.html" class="identifier">int_</a><2></span> <span class="pre">></span></tt></li>
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<li><tt class="literal"><span class="pre"><a href="./if.html" class="identifier">if_</a><</span> <span class="pre"><a href="./less.html" class="identifier">less</a><_1,</span> <span class="pre"><a href="./int.html" class="identifier">int_</a><7></span> <span class="pre">>,</span> <span class="pre"><a href="./plus.html" class="identifier">plus</a><_1,_2>,</span> <span class="pre">_1</span> <span class="pre">></span></tt></li>
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</ul>
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</div>
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<div class="section" id="lambda-see-also">
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<h3><a class="subsection-title" href="#see-also" name="see-also">See also</a></h3>
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<p><a class="reference" href="./metafunctions.html">Metafunctions</a>, <a class="reference" href="./placeholders.html">Placeholders</a>, <a class="refentry reference" href="./apply.html"><tt class="refentry literal"><span class="pre">apply</span></tt></a>, <a class="refentry reference" href="./lambda.html"><tt class="refentry literal"><span class="pre">lambda</span></tt></a></p>
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