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459 lines
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<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
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<title>Concepts</title>
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<link rel="up" href="../yap.html" title="Chapter 48. Boost.YAP">
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<table cellpadding="2" width="100%"><tr>
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<td align="center"><a href="../../../index.html">Home</a></td>
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<a accesskey="p" href="manual.html"><img src="../../../doc/src/images/prev.png" alt="Prev"></a><a accesskey="u" href="../yap.html"><img src="../../../doc/src/images/up.png" alt="Up"></a><a accesskey="h" href="../index.html"><img src="../../../doc/src/images/home.png" alt="Home"></a><a accesskey="n" href="compiler_support.html"><img src="../../../doc/src/images/next.png" alt="Next"></a>
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<div class="section">
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<div class="titlepage"><div><div><h2 class="title" style="clear: both">
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<a name="boost_yap.concepts"></a><a class="link" href="concepts.html" title="Concepts">Concepts</a>
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</h2></div></div></div>
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<h4>
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<a name="boost_yap.concepts.h0"></a>
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<span class="phrase"><a name="boost_yap.concepts.expression"></a></span><a class="link" href="concepts.html#boost_yap.concepts.expression">Expression</a>
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</h4>
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<p>
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<a class="link" href="concepts.html#boost_yap.concepts.expression">Expression</a> is the central
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concept in Boost.YAP. It must contain at least an <code class="computeroutput"><a class="link" href="../boost/yap/expr_kind.html" title="Type expr_kind">expr_kind</a></code> and a <code class="computeroutput"><span class="identifier">boost</span><span class="special">::</span><span class="identifier">hana</span><span class="special">::</span><span class="identifier">tuple</span><span class="special"><></span></code>
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of values.
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</p>
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<p>
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Here is a summary of the requirements on <a class="link" href="concepts.html#boost_yap.concepts.expression">Expression</a>.
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In the tables below, <code class="computeroutput"><span class="identifier">E</span></code> is a
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type that models <a class="link" href="concepts.html#boost_yap.concepts.expression">Expression</a>;
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<code class="computeroutput"><span class="identifier">e</span></code> is an object of type <code class="computeroutput"><span class="identifier">E</span></code>; <code class="computeroutput"><span class="identifier">Tuple</span></code>
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is an instantiation of <code class="computeroutput"><span class="identifier">boost</span><span class="special">::</span><span class="identifier">hana</span><span class="special">::</span><span class="identifier">tuple</span><span class="special"><></span></code>;
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and <code class="computeroutput"><span class="identifier">t</span></code> is an object of type
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<code class="computeroutput"><span class="identifier">Tuple</span></code>.
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</p>
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<div class="table">
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<a name="boost_yap.concepts.expression_requirements"></a><p class="title"><b>Table 48.6. Expression Requirements</b></p>
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<div class="table-contents"><table class="table" summary="Expression Requirements">
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<colgroup>
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<col>
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<col>
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<col>
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<col>
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</colgroup>
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<thead><tr>
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<th>
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<p>
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Expression
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</p>
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</th>
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<th>
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<p>
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Type
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</p>
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</th>
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<th>
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<p>
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Description
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</p>
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</th>
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<th>
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<p>
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Notes
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</p>
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</th>
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</tr></thead>
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<tbody>
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<tr>
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<td>
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<p>
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<code class="computeroutput"><span class="identifier">E</span><span class="special">::</span><span class="identifier">kind</span></code>
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</p>
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</td>
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<td>
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<p>
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<code class="computeroutput"><a class="link" href="../boost/yap/expr_kind.html" title="Type expr_kind">expr_kind</a></code>
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</p>
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</td>
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<td>
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<p>
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The kind of expression <code class="computeroutput"><span class="identifier">E</span></code>
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is.
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</p>
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</td>
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<td>
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<p>
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Must be a compile-time constant.
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</p>
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</td>
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</tr>
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<tr>
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<td>
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<p>
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<code class="computeroutput"><span class="identifier">e</span><span class="special">.</span><span class="identifier">elements</span></code>
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</p>
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</td>
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<td>
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<p>
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<code class="computeroutput"><span class="identifier">Tuple</span></code>
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</p>
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</td>
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<td>
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<p>
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The child expressions of <code class="computeroutput"><span class="identifier">e</span></code>.
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</p>
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</td>
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<td>
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<p>
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The types of the elements must be appropriate to the kind of the
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expression.
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</p>
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</td>
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</tr>
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<tr>
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<td>
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<p>
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<code class="computeroutput"><span class="identifier">E</span> <span class="identifier">e</span><span class="special">{</span><span class="identifier">t</span><span class="special">}</span></code>
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</p>
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</td>
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<td>
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</td>
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<td>
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<p>
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Construction/initialization of <code class="computeroutput"><span class="identifier">e</span></code>.
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</p>
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</td>
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<td>
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<p>
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<code class="computeroutput"><span class="identifier">t</span></code> must be stored
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in <code class="computeroutput"><span class="identifier">e</span><span class="special">.</span><span class="identifier">elements</span></code>.
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</p>
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</td>
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</tr>
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</tbody>
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</table></div>
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</div>
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<br class="table-break"><p>
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As stated above, the <code class="computeroutput"><span class="identifier">elements</span></code>
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data member must match the kind of the expression:
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</p>
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<div class="table">
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<a name="boost_yap.concepts.expression_requirements0"></a><p class="title"><b>Table 48.7. Expression Requirements</b></p>
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<div class="table-contents"><table class="table" summary="Expression Requirements">
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<colgroup>
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<col>
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<col>
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<col>
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<col>
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</colgroup>
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<thead><tr>
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<th>
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<p>
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<code class="computeroutput"><span class="identifier">E</span><span class="special">::</span><span class="identifier">kind</span></code>
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</p>
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</th>
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<th>
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<p>
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<code class="computeroutput"><span class="identifier">hana</span><span class="special">::</span><span class="identifier">size</span><span class="special">(</span><span class="identifier">e</span><span class="special">.</span><span class="identifier">elements</span><span class="special">)</span></code>
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</p>
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</th>
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<th>
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<p>
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Possible Tuple Element Types
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</p>
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</th>
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<th>
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<p>
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Notes
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</p>
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</th>
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</tr></thead>
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<tbody>
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<tr>
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<td>
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<p>
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<code class="computeroutput"><span class="identifier">expr_kind</span><span class="special">::</span><span class="identifier">expr_ref</span></code>
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</p>
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</td>
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<td>
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<p>
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1
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</p>
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</td>
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<td>
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<p>
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Any non-<a class="link" href="../boost/yap/expr_kind.html#boost.yap.expr_kind.expr_ref"><code class="computeroutput"><span class="identifier">expr_kind</span><span class="special">::</span><span class="identifier">expr_ref</span></code></a> <a class="link" href="concepts.html#boost_yap.concepts.expression">Expression</a>.
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</p>
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</td>
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<td>
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</td>
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</tr>
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<tr>
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<td>
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<p>
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<code class="computeroutput"><span class="identifier">expr_kind</span><span class="special">::</span><span class="identifier">terminal</span></code>
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</p>
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</td>
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<td>
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<p>
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1
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</p>
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</td>
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<td>
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<p>
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Any non-<a class="link" href="concepts.html#boost_yap.concepts.expression">Expression</a>.
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</p>
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</td>
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<td>
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<p>
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A terminal with a <code class="computeroutput"><a class="link" href="../boost/yap/placeholder.html" title="Struct template placeholder">placeholder<></a></code>
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value will be treated as a placeholder.
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</p>
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</td>
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</tr>
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<tr>
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<td>
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<p>
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Any unary operator
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</p>
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</td>
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<td>
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<p>
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1
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</p>
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</td>
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<td>
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<p>
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Any <a class="link" href="concepts.html#boost_yap.concepts.expression">Expression</a>.
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</p>
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</td>
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<td>
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</td>
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</tr>
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<tr>
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<td>
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<p>
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Any binary operator
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</p>
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</td>
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<td>
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<p>
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2
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</p>
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</td>
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<td>
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<p>
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Any <a class="link" href="concepts.html#boost_yap.concepts.expression">Expression</a>.
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</p>
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</td>
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<td>
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</td>
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</tr>
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<tr>
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<td>
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<p>
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<code class="computeroutput"><span class="identifier">expr_kind</span><span class="special">::</span><span class="identifier">if_else</span></code>
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</p>
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</td>
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<td>
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<p>
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3
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</p>
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</td>
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<td>
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<p>
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Any <a class="link" href="concepts.html#boost_yap.concepts.expression">Expression</a>.
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</p>
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</td>
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<td>
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</td>
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</tr>
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<tr>
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<td>
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<p>
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<code class="computeroutput"><span class="identifier">expr_kind</span><span class="special">::</span><span class="identifier">call</span></code>
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</p>
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</td>
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<td>
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<p>
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Any number >= 1.
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</p>
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</td>
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<td>
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<p>
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Any <a class="link" href="concepts.html#boost_yap.concepts.expression">Expression</a>.
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</p>
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</td>
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<td>
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</td>
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</tr>
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</tbody>
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</table></div>
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</div>
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<br class="table-break"><h4>
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<a name="boost_yap.concepts.h1"></a>
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<span class="phrase"><a name="boost_yap.concepts.expressiontemplate"></a></span><a class="link" href="concepts.html#boost_yap.concepts.expressiontemplate">ExpressionTemplate</a>
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</h4>
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<p>
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<a class="link" href="concepts.html#boost_yap.concepts.expressiontemplate">ExpressionTemplate</a>
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is any template with two parameters that, when instantiated with an <code class="computeroutput"><a class="link" href="../boost/yap/expr_kind.html" title="Type expr_kind">expr_kind</a></code>
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and a <code class="computeroutput"><span class="identifier">boost</span><span class="special">::</span><span class="identifier">hana</span><span class="special">::</span><span class="identifier">tuple</span><span class="special"><></span></code>, results in an <a class="link" href="concepts.html#boost_yap.concepts.expression">Expression</a>.
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</p>
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<h4>
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<a name="boost_yap.concepts.h2"></a>
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<span class="phrase"><a name="boost_yap.concepts.transform"></a></span><a class="link" href="concepts.html#boost_yap.concepts.transform">Transform</a>
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</h4>
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<p>
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<code class="computeroutput"><a class="link" href="../boost/yap/transform.html" title="Function template transform">transform()</a></code> takes a <a class="link" href="concepts.html#boost_yap.concepts.transform">Transform</a>
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as its second parameter. A <a class="link" href="concepts.html#boost_yap.concepts.transform">Transform</a>
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is a <a href="http://en.cppreference.com/w/cpp/concept/Callable" target="_top">Callable</a>
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that takes expressions and returns values of unconstrained type. There are
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two sorts of overloads <a class="link" href="concepts.html#boost_yap.concepts.transform">Transform</a>
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may use: <a class="link" href="concepts.html#boost_yap.concepts.expressiontransform">ExpressionTransform</a>
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and <a class="link" href="concepts.html#boost_yap.concepts.tagtransform">TagTransform</a>.
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</p>
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<p>
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A <a class="link" href="concepts.html#boost_yap.concepts.transform">Transform</a> may have any
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number of overloads, including none.
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</p>
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<h4>
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<a name="boost_yap.concepts.h3"></a>
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<span class="phrase"><a name="boost_yap.concepts.expressiontransform"></a></span><a class="link" href="concepts.html#boost_yap.concepts.expressiontransform">ExpressionTransform</a>
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</h4>
|
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<p>
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<a class="link" href="concepts.html#boost_yap.concepts.expressiontransform">ExpressionTransform</a>
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takes an <a class="link" href="concepts.html#boost_yap.concepts.expression">Expression</a> as
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its only parameter. Here are some examples.
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</p>
|
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<p>
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This one takes any <a class="link" href="concepts.html#boost_yap.concepts.expression">Expression</a>:
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||
</p>
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<pre class="programlisting"><span class="keyword">struct</span> <span class="identifier">xform</span>
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<span class="special">{</span>
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<span class="keyword">template</span> <span class="special"><</span><span class="keyword">typename</span> <span class="identifier">Expr</span><span class="special">></span>
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<span class="keyword">auto</span> <span class="keyword">operator</span><span class="special">()</span> <span class="special">(</span><span class="identifier">Expr</span> <span class="keyword">const</span> <span class="special">&</span> <span class="identifier">expr</span><span class="special">)</span>
|
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<span class="special">{</span>
|
||
<span class="comment">// ...</span>
|
||
<span class="special">}</span>
|
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<span class="special">};</span>
|
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</pre>
|
||
<p>
|
||
This one takes any type of <a class="link" href="concepts.html#boost_yap.concepts.expression">Expression</a>
|
||
that satisfies the constraints imposed by its template parameters:
|
||
</p>
|
||
<pre class="programlisting"><span class="keyword">template</span> <span class="special"><</span><span class="keyword">typename</span> <span class="identifier">Expr1</span><span class="special">,</span> <span class="keyword">typename</span> <span class="identifier">Expr2</span><span class="special">,</span> <span class="keyword">typename</span> <span class="identifier">Expr3</span><span class="special">></span>
|
||
<span class="keyword">decltype</span><span class="special">(</span><span class="keyword">auto</span><span class="special">)</span> <span class="identifier">xform</span> <span class="special">(</span>
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||
<span class="identifier">boost</span><span class="special">::</span><span class="identifier">yap</span><span class="special">::</span><span class="identifier">expression</span><span class="special"><</span>
|
||
<span class="identifier">boost</span><span class="special">::</span><span class="identifier">yap</span><span class="special">::</span><span class="identifier">expr_kind</span><span class="special">::</span><span class="identifier">plus</span><span class="special">,</span>
|
||
<span class="identifier">boost</span><span class="special">::</span><span class="identifier">hana</span><span class="special">::</span><span class="identifier">tuple</span><span class="special"><</span>
|
||
<span class="identifier">boost</span><span class="special">::</span><span class="identifier">yap</span><span class="special">::</span><span class="identifier">expression</span><span class="special"><</span>
|
||
<span class="identifier">boost</span><span class="special">::</span><span class="identifier">yap</span><span class="special">::</span><span class="identifier">expr_kind</span><span class="special">::</span><span class="identifier">multiplies</span><span class="special">,</span>
|
||
<span class="identifier">boost</span><span class="special">::</span><span class="identifier">hana</span><span class="special">::</span><span class="identifier">tuple</span><span class="special"><</span>
|
||
<span class="identifier">Expr1</span><span class="special">,</span>
|
||
<span class="identifier">Expr2</span>
|
||
<span class="special">></span>
|
||
<span class="special">>,</span>
|
||
<span class="identifier">Expr3</span>
|
||
<span class="special">></span>
|
||
<span class="special">></span> <span class="keyword">const</span> <span class="special">&</span> <span class="identifier">expr</span>
|
||
<span class="special">)</span> <span class="special">{</span>
|
||
<span class="comment">// ...</span>
|
||
<span class="special">}</span>
|
||
</pre>
|
||
<p>
|
||
This one takes only a specific type:
|
||
</p>
|
||
<pre class="programlisting"><span class="keyword">decltype</span><span class="special">(</span><span class="keyword">auto</span><span class="special">)</span> <span class="identifier">xform</span> <span class="special">(</span>
|
||
<span class="keyword">decltype</span><span class="special">(</span><span class="identifier">term</span><span class="special"><</span><span class="identifier">number</span><span class="special">>{{</span><span class="number">0.0</span><span class="special">}}</span> <span class="special">*</span> <span class="identifier">number</span><span class="special">{}</span> <span class="special">+</span> <span class="identifier">number</span><span class="special">{})</span> <span class="keyword">const</span> <span class="special">&</span> <span class="identifier">expr</span>
|
||
<span class="special">)</span> <span class="special">{</span>
|
||
<span class="comment">// ...</span>
|
||
<span class="special">}</span>
|
||
</pre>
|
||
<h4>
|
||
<a name="boost_yap.concepts.h4"></a>
|
||
<span class="phrase"><a name="boost_yap.concepts.tagtransform"></a></span><a class="link" href="concepts.html#boost_yap.concepts.tagtransform">TagTransform</a>
|
||
</h4>
|
||
<p>
|
||
<a class="link" href="concepts.html#boost_yap.concepts.tagtransform">TagTransform</a> takes a
|
||
tag-type as its first parameter, and the individual elements of an expression
|
||
as the remaining parameters.
|
||
</p>
|
||
<p>
|
||
Tags are named such that the tag for an expression with <code class="computeroutput"><a class="link" href="../boost/yap/expr_kind.html" title="Type expr_kind">expr_kind</a></code> <code class="computeroutput"><span class="identifier">expr_kind</span><span class="special">::</span><span class="identifier">foo</span></code> is
|
||
named <code class="computeroutput"><span class="identifier">foo_tag</span></code>. Here are some
|
||
examples.
|
||
</p>
|
||
<p>
|
||
This one takes any terminal that contains a <code class="computeroutput"><span class="identifier">user</span><span class="special">::</span><span class="identifier">number</span></code>
|
||
(or reference to such a terminal):
|
||
</p>
|
||
<pre class="programlisting"><span class="keyword">struct</span> <span class="identifier">xform</span>
|
||
<span class="special">{</span>
|
||
<span class="keyword">decltype</span><span class="special">(</span><span class="keyword">auto</span><span class="special">)</span> <span class="keyword">operator</span><span class="special">()</span> <span class="special">(</span><span class="identifier">boost</span><span class="special">::</span><span class="identifier">yap</span><span class="special">::</span><span class="identifier">terminal_tag</span><span class="special">,</span> <span class="identifier">user</span><span class="special">::</span><span class="identifier">number</span> <span class="keyword">const</span> <span class="special">&</span> <span class="identifier">n</span><span class="special">)</span>
|
||
<span class="special">{</span>
|
||
<span class="comment">// ...</span>
|
||
<span class="special">}</span>
|
||
<span class="special">};</span>
|
||
</pre>
|
||
<p>
|
||
This one takes any plus expression that contains a pair of <code class="computeroutput"><span class="identifier">user</span><span class="special">::</span><span class="identifier">number</span></code>
|
||
terminals (or references to terminals):
|
||
</p>
|
||
<pre class="programlisting"><span class="keyword">decltype</span><span class="special">(</span><span class="keyword">auto</span><span class="special">)</span> <span class="identifier">xform</span> <span class="special">(</span><span class="identifier">boost</span><span class="special">::</span><span class="identifier">yap</span><span class="special">::</span><span class="identifier">plus_tag</span><span class="special">,</span> <span class="identifier">user</span><span class="special">::</span><span class="identifier">number</span> <span class="identifier">lhs</span><span class="special">,</span> <span class="identifier">user</span><span class="special">::</span><span class="identifier">number</span> <span class="identifier">rhs</span><span class="special">)</span>
|
||
<span class="special">{</span>
|
||
<span class="comment">// ...</span>
|
||
<span class="special">}</span>
|
||
</pre>
|
||
<p>
|
||
This one takes any negation expression:
|
||
</p>
|
||
<pre class="programlisting"><span class="keyword">struct</span> <span class="identifier">xform</span>
|
||
<span class="special">{</span>
|
||
<span class="keyword">template</span> <span class="special"><</span><span class="keyword">typename</span> <span class="identifier">Expr</span><span class="special">></span>
|
||
<span class="keyword">decltype</span><span class="special">(</span><span class="keyword">auto</span><span class="special">)</span> <span class="keyword">operator</span><span class="special">()</span> <span class="special">(</span><span class="identifier">boost</span><span class="special">::</span><span class="identifier">yap</span><span class="special">::</span><span class="identifier">negate_tag</span><span class="special">,</span> <span class="identifier">Expr</span> <span class="keyword">const</span> <span class="special">&</span> <span class="identifier">expr</span><span class="special">)</span>
|
||
<span class="special">{</span>
|
||
<span class="comment">// ...</span>
|
||
<span class="special">}</span>
|
||
<span class="special">};</span>
|
||
</pre>
|
||
<p>
|
||
This one takes any call expression with two terminals (or references to terminals)
|
||
containing values convertible to <code class="computeroutput"><span class="keyword">double</span></code>:
|
||
</p>
|
||
<pre class="programlisting"><span class="keyword">struct</span> <span class="identifier">xform</span>
|
||
<span class="special">{</span>
|
||
<span class="keyword">decltype</span><span class="special">(</span><span class="keyword">auto</span><span class="special">)</span> <span class="keyword">operator</span><span class="special">()</span> <span class="special">(</span><span class="identifier">boost</span><span class="special">::</span><span class="identifier">yap</span><span class="special">::</span><span class="identifier">call_tag</span><span class="special">,</span> <span class="identifier">tag_type</span><span class="special">,</span> <span class="keyword">double</span> <span class="identifier">a</span><span class="special">,</span> <span class="keyword">double</span> <span class="identifier">b</span><span class="special">)</span>
|
||
<span class="special">{</span>
|
||
<span class="comment">// ...</span>
|
||
<span class="special">}</span>
|
||
<span class="special">}</span>
|
||
</pre>
|
||
</div>
|
||
<table xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" width="100%"><tr>
|
||
<td align="left"></td>
|
||
<td align="right"><div class="copyright-footer">Copyright © 2018 T. Zachary Laine<p>
|
||
Distributed under the Boost Software License, Version 1.0. (See accompanying
|
||
file LICENSE_1_0.txt or copy at <a href="http://www.boost.org/LICENSE_1_0.txt" target="_top">http://www.boost.org/LICENSE_1_0.txt</a>)
|
||
</p>
|
||
</div></td>
|
||
</tr></table>
|
||
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|
||
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|
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