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219 lines
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<title>Concept Domain</title>
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<div class="refentry">
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<a name="Domain"></a><div class="titlepage"></div>
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<div class="refnamediv">
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<h2><span class="refentrytitle">Concept Domain</span></h2>
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<p>Domain</p>
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</div>
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<div class="refsect1">
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<a name="id-1.3.34.5.60.3"></a><h2>Description</h2>
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<p>
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A Domain creates an association between expressions and a so-called
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generator, which is a function that maps an expression in the default
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domain to an equivalent expression in this Domain. It also associates
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an expression with a grammar, to which all expressions within this
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Domain must conform.
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</p>
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</div>
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<div class="refsect1">
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<a name="id-1.3.34.5.60.4"></a><h2>Associated types</h2>
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<div class="itemizedlist"><ul class="itemizedlist" style="list-style-type: disc; ">
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<li class="listitem">
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<p><span class="bold"><strong>proto_grammar</strong></span></p>
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<pre class="literallayout">Domain::proto_grammar</pre>
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<p>
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</p>
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<p>The grammar to which every expression in this Domain
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must conform.</p>
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<p>
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</p>
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</li>
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<li class="listitem">
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<p><span class="bold"><strong>proto_generator</strong></span></p>
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<pre class="literallayout">Domain::proto_generator</pre>
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<p>
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</p>
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<p>
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A Unary Polymorphic Function that accepts expressions in the
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default domain and emits expressions in this Domain.
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</p>
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<p>
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</p>
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</li>
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<li class="listitem">
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<p><span class="bold"><strong>proto_super_domain</strong></span></p>
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<pre class="literallayout">Domain::proto_super_domain</pre>
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<p>
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</p>
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<p>
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The Domain that is a super-domain of this domain, if
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any such domain exists. If not, it is some unspecified
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type.
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</p>
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<p>
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</p>
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</li>
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<li class="listitem">
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<p><span class="bold"><strong>result_type</strong></span></p>
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<pre class="literallayout">boost::result_of<Domain(Expr)>::type</pre>
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<p>
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</p>
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<p>
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The type of the result of applying
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<code class="computeroutput">proto_generator</code> to
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the specified expression type. The result is required to
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model <a class="link" href="Expr.html" title="Concept Expr">Expr</a>. The domain type
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associated with <code class="computeroutput">result_type</code>
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(<code class="computeroutput">result_type::proto_domain</code>)
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is required to be the same type as this Domain.
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</p>
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<p>
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</p>
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</li>
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<li class="listitem">
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<p><span class="bold"><strong>as_expr_result_type</strong></span></p>
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<pre class="literallayout">Domain::as_expr<Object>::result_type</pre>
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<p>
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</p>
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<p>
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The result of converting some type to a Proto expression
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type in this domain. This is used, for instance, when
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calculating the type of a variable to hold a Proto
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expression.
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<code class="computeroutput">as_expr_result_type</code>
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models
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<code class="computeroutput"><a class="link" href="Expr.html" title="Concept Expr">Expr</a></code>.
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</p>
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<p>
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</p>
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</li>
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<li class="listitem">
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<p><span class="bold"><strong>as_child_result_type</strong></span></p>
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<pre class="literallayout">Domain::as_child<Object>::result_type</pre>
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<p>
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</p>
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<p>
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The result of converting some type to a Proto expression
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type in this domain. This is used, for instance, to
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compute the type of an object suitable for storage
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as a child in an expression tree.
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<code class="computeroutput">as_child_result_type</code>
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models
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<code class="computeroutput"><a class="link" href="Expr.html" title="Concept Expr">Expr</a></code>.
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</p>
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<p>
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</p>
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</li>
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</ul></div>
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</div>
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<div class="refsect1">
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<a name="id-1.3.34.5.60.5"></a><h2>Notation</h2>
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<div class="variablelist"><dl class="variablelist">
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<dt><span class="term">Domain</span></dt>
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<dd>A type playing the role of domain-type in the <a class="link" href="Domain.html" title="Concept Domain">Domain</a> concept.</dd>
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<dt><span class="term">Expr</span></dt>
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<dd>A type playing the role of expression-type in the <a class="link" href="Domain.html" title="Concept Domain">Domain</a> concept.</dd>
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<dt><span class="term">Object</span></dt>
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<dd>A type playing the role of object-type in the <a class="link" href="Domain.html" title="Concept Domain">Domain</a> concept.</dd>
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<dt><span class="term"><code class="varname">d</code></span></dt>
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<dd>Object of type Domain</dd>
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<dt><span class="term"><code class="varname">e</code></span></dt>
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<dd>Object of type Expr</dd>
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<dt><span class="term"><code class="varname">o</code></span></dt>
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<dd>Object of type Object</dd>
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</dl></div>
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</div>
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<div class="refsect1">
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<a name="id-1.3.34.5.60.6"></a><h2>Valid expressions</h2>
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<div class="informaltable"><table class="table">
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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>Name</th>
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<th>Expression</th>
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<th>Type</th>
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<th>Semantics</th>
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</tr></thead>
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<tbody>
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<tr>
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<td><p>Apply Generator</p></td>
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<td><p>d(e)</p></td>
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<td><p><span class="type">result_type</span></p></td>
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<td><p>
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The result of applying <code class="computeroutput">proto_generator</code>
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to the specified expression.
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</p></td>
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</tr>
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<tr>
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<td><p>As Expression</p></td>
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<td><p>Domain::as_expr< Object >()(o)</p></td>
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<td><p><span class="type">as_expr_result_type</span></p></td>
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<td><p>
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The result of converting some object to a Proto expression
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in this domain. It returns a Proto expression object that
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is suitable for storage in a variable. It should return a
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new object, which may be a copy of the object passed in.
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</p></td>
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</tr>
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<tr>
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<td><p>As Child</p></td>
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<td><p>Domain::as_child< Object >()(o)</p></td>
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<td><p><span class="type">as_child_result_type</span></p></td>
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<td><p>
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The result of converting some object to a Proto expression
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in this domain. It returns an object suitable for storage
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as a child in an expression tree, which may simply be a
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reference to the object passed in.
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</p></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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<div class="refsect1">
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<a name="id-1.3.34.5.60.7"></a><h2>Models</h2>
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<div class="itemizedlist"><ul class="itemizedlist" style="list-style-type: disc; "><li class="listitem"><span class="simplelist"><span class="type">boost::proto::default_domain</span></span></li></ul></div>
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</div>
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</div>
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<table xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" width="100%"><tr>
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<td align="left"></td>
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<td align="right"><div class="copyright-footer">Copyright © 2008 Eric Niebler<p>
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Distributed under the Boost Software License, Version 1.0. (See accompanying
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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>)
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</p>
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</div></td>
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</tr></table>
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<hr>
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<div class="spirit-nav">
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