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| <div class="refentry"> |
| <a name="Domain"></a><div class="titlepage"></div> |
| <div class="refnamediv"> |
| <h2><span class="refentrytitle">Concept Domain</span></h2> |
| <p>Domain</p> |
| </div> |
| <div class="refsect1"> |
| <a name="id2456262"></a><h2>Description</h2> |
| <p> |
| A Domain creates an association between expressions and a so-called |
| generator, which is a function that maps an expression in the default |
| domain to an equivalent expression in this Domain. It also associates |
| an expression with a grammar, to which all expressions within this |
| Domain must conform. |
| </p> |
| </div> |
| <div class="refsect1"> |
| <a name="id2456275"></a><h2>Associated types</h2> |
| <div class="itemizedlist"><ul class="itemizedlist" type="disc"> |
| <li class="listitem"> |
| <p><span class="bold"><strong>proto_grammar</strong></span></p> |
| <pre class="literallayout">Domain::proto_grammar</pre> |
| <p> |
| </p> |
| <p>The grammar to which every expression in this Domain |
| must conform.</p> |
| <p> |
| </p> |
| </li> |
| <li class="listitem"> |
| <p><span class="bold"><strong>proto_generator</strong></span></p> |
| <pre class="literallayout">Domain::proto_generator</pre> |
| <p> |
| </p> |
| <p> |
| A Unary Polymorphic Function that accepts expressions in the |
| default domain and emits expressions in this Domain. |
| </p> |
| <p> |
| </p> |
| </li> |
| <li class="listitem"> |
| <p><span class="bold"><strong>proto_super_domain</strong></span></p> |
| <pre class="literallayout">Domain::proto_super_domain</pre> |
| <p> |
| </p> |
| <p> |
| The Domain that is a super-domain of this domain, if |
| any such domain exists. If not, it is some unspecified |
| type. |
| </p> |
| <p> |
| </p> |
| </li> |
| <li class="listitem"> |
| <p><span class="bold"><strong>result_type</strong></span></p> |
| <pre class="literallayout">boost::result_of<Domain(Expr)>::type</pre> |
| <p> |
| </p> |
| <p> |
| The type of the result of applying |
| <code class="computeroutput">proto_generator</code> to |
| the specified expression type. The result is required to |
| model <a class="link" href="Expr.html" title="Concept Expr">Expr</a>. The domain type |
| associated with <code class="computeroutput">result_type</code> |
| (<code class="computeroutput">result_type::proto_domain</code>) |
| is required to be the same type as this Domain. |
| </p> |
| <p> |
| </p> |
| </li> |
| <li class="listitem"> |
| <p><span class="bold"><strong>as_expr_result_type</strong></span></p> |
| <pre class="literallayout">Domain::as_expr<Object>::result_type</pre> |
| <p> |
| </p> |
| <p> |
| The result of converting some type to a Proto expression |
| type in this domain. This is used, for instance, when |
| calculating the type of a variable to hold a Proto |
| expression. |
| <code class="computeroutput">as_expr_result_type</code> |
| models |
| <code class="computeroutput"><a class="link" href="Expr.html" title="Concept Expr">Expr</a></code>. |
| </p> |
| <p> |
| </p> |
| </li> |
| <li class="listitem"> |
| <p><span class="bold"><strong>as_child_result_type</strong></span></p> |
| <pre class="literallayout">Domain::as_child<Object>::result_type</pre> |
| <p> |
| </p> |
| <p> |
| The result of converting some type to a Proto expression |
| type in this domain. This is used, for instance, to |
| compute the type of an object suitable for storage |
| as a child in an expression tree. |
| <code class="computeroutput">as_child_result_type</code> |
| models |
| <code class="computeroutput"><a class="link" href="Expr.html" title="Concept Expr">Expr</a></code>. |
| </p> |
| <p> |
| </p> |
| </li> |
| </ul></div> |
| </div> |
| <div class="refsect1"> |
| <a name="id2456468"></a><h2>Notation</h2> |
| <div class="variablelist"><dl> |
| <dt><span class="term">Domain</span></dt> |
| <dd>A type playing the role of domain-type in the <a class="link" href="Domain.html" title="Concept Domain">Domain</a> concept.</dd> |
| <dt><span class="term">Expr</span></dt> |
| <dd>A type playing the role of expression-type in the <a class="link" href="Domain.html" title="Concept Domain">Domain</a> concept.</dd> |
| <dt><span class="term">Object</span></dt> |
| <dd>A type playing the role of object-type in the <a class="link" href="Domain.html" title="Concept Domain">Domain</a> concept.</dd> |
| <dt><span class="term"><code class="varname">d</code></span></dt> |
| <dd>Object of type Domain</dd> |
| <dt><span class="term"><code class="varname">e</code></span></dt> |
| <dd>Object of type Expr</dd> |
| <dt><span class="term"><code class="varname">o</code></span></dt> |
| <dd>Object of type Object</dd> |
| </dl></div> |
| </div> |
| <div class="refsect1"> |
| <a name="id2456540"></a><h2>Valid expressions</h2> |
| <div class="informaltable"><table class="table"> |
| <colgroup> |
| <col> |
| <col> |
| <col> |
| <col> |
| </colgroup> |
| <thead><tr> |
| <th>Name</th> |
| <th>Expression</th> |
| <th>Type</th> |
| <th>Semantics</th> |
| </tr></thead> |
| <tbody> |
| <tr> |
| <td><p>Apply Generator</p></td> |
| <td><p>d(e)</p></td> |
| <td><p><span class="type">result_type</span></p></td> |
| <td><p> |
| The result of applying <code class="computeroutput">proto_generator</code> |
| to the specified expression. |
| </p></td> |
| </tr> |
| <tr> |
| <td><p>As Expression</p></td> |
| <td><p>Domain::as_expr< Object >()(o)</p></td> |
| <td><p><span class="type">as_expr_result_type</span></p></td> |
| <td><p> |
| The result of converting some object to a Proto expression |
| in this domain. It returns a Proto expression object that |
| is suitable for storage in a variable. It should return a |
| new object, which may be a copy of the object passed in. |
| </p></td> |
| </tr> |
| <tr> |
| <td><p>As Child</p></td> |
| <td><p>Domain::as_child< Object >()(o)</p></td> |
| <td><p><span class="type">as_child_result_type</span></p></td> |
| <td><p> |
| The result of converting some object to a Proto expression |
| in this domain. It returns an object suitable for storage |
| as a child in an expression tree, which may simply be a |
| reference to the object passed in. |
| </p></td> |
| </tr> |
| </tbody> |
| </table></div> |
| </div> |
| <div class="refsect1"> |
| <a name="id2456625"></a><h2>Models</h2> |
| <div class="itemizedlist"><ul class="itemizedlist" type="disc"><li class="listitem"><span class="simplelist"><span class="type">boost::proto::default_domain</span></span></li></ul></div> |
| </div> |
| </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 © 2008 Eric Niebler<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> |
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