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Fusion: BOOST_FUSION_ADAPT_ADT documentation [SVN r65756]
2010-10-04 20:50:31 +00:00
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<div class="titlepage"><div><div><h3 class="title">
<a name="fusion.adapted.adapt_adt"></a><a class="link" href="adapt_adt.html" title="BOOST_FUSION_ADAPT_ADT">BOOST_FUSION_ADAPT_ADT</a>
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<p>
BOOST_FUSION_ADAPT_ADT is a macro than can be used to generate all the necessary
boilerplate to adapt an arbitrary class type as a model of <a class="link" href="../sequence/concepts/random_access_sequence.html" title="Random Access Sequence">Random
Access Sequence</a>.
</p>
<a name="fusion.adapted.adapt_adt.synopsis"></a><h5>
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Fusion: BOOST_FUSION_ADAPT_ADT documentation [SVN r65756]
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<a class="link" href="adapt_adt.html#fusion.adapted.adapt_adt.synopsis">Synopsis</a>
</h5>
<pre class="programlisting"><span class="identifier">BOOST_FUSION_ADAPT_ADT</span><span class="special">(</span>
<span class="identifier">type_name</span><span class="special">,</span>
<span class="special">(</span><span class="identifier">attribute_type0</span><span class="special">,</span> <span class="identifier">attribute_const_type0</span><span class="special">,</span> <span class="identifier">get_expr0</span><span class="special">,</span> <span class="identifier">set_expr0</span><span class="special">)</span>
<span class="special">(</span><span class="identifier">attribute_type1</span><span class="special">,</span> <span class="identifier">attribute_const_type1</span><span class="special">,</span> <span class="identifier">get_expr1</span><span class="special">,</span> <span class="identifier">set_expr1</span><span class="special">)</span>
<span class="special">...</span>
<span class="special">)</span>
</pre>
<a name="fusion.adapted.adapt_adt.expression_semantics"></a><h5>
Fusion: fixed yet another typo [SVN r65758]
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Fusion: BOOST_FUSION_ADAPT_ADT documentation [SVN r65756]
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<a class="link" href="adapt_adt.html#fusion.adapted.adapt_adt.expression_semantics">Expression
Semantics</a>
</h5>
<p>
The above macro generates the necessary code to adapt <code class="computeroutput"><span class="identifier">type_name</span></code>
as a model of <a class="link" href="../sequence/concepts/random_access_sequence.html" title="Random Access Sequence">Random
Access Sequence</a>. The sequence of <code class="literal">(attribute_type<span class="emphasis"><em>N</em></span>,
attribute_const_type<span class="emphasis"><em>N</em></span>, get_expr<span class="emphasis"><em>N</em></span>,
set_expr<span class="emphasis"><em>N</em></span>)</code> quadruples declares the types,
const types, get-expressions and set-expressions of the elements that are
part of the adapted fusion sequence. <code class="literal">get_expr<span class="emphasis"><em>N</em></span></code>
is the expression that is invoked to get the <span class="emphasis"><em>N</em></span>th element
of an instance of <code class="computeroutput"><span class="identifier">type_name</span></code>.
This expression may access a variable named <code class="computeroutput"><span class="identifier">obj</span></code>
of type <code class="computeroutput"><span class="identifier">type_name</span><span class="special">&amp;</span></code>
or <code class="computeroutput"><span class="identifier">type_name</span> <span class="keyword">const</span><span class="special">&amp;</span></code> which represents the underlying instance
of <code class="computeroutput"><span class="identifier">type_name</span></code>. <code class="literal">attribute_type<span class="emphasis"><em>N</em></span></code>
and <code class="literal">attribute_const_type<span class="emphasis"><em>N</em></span></code> may specify
the types that <code class="literal">get_expr<span class="emphasis"><em>N</em></span></code> denotes
to. <code class="literal">set_expr<span class="emphasis"><em>N</em></span></code> is the expression that
is invoked to set the <span class="emphasis"><em>N</em></span>th element of an instance of
<code class="computeroutput"><span class="identifier">type_name</span></code>. This expression
may access variables named <code class="computeroutput"><span class="identifier">obj</span></code>
of type <code class="computeroutput"><span class="identifier">type_name</span><span class="special">&amp;</span></code>,
which represent the corresponding instance of <code class="computeroutput"><span class="identifier">type_name</span></code>,
and <code class="computeroutput"><span class="identifier">val</span></code> of an arbitrary const-qualified
reference template type parameter <code class="computeroutput"><span class="identifier">Val</span></code>,
which represents the right operand of the assignment expression.
</p>
<p>
The actual return type of fusion's intrinsic sequence access (meta-)functions
when in invoked with (an instance of) <code class="computeroutput"><span class="identifier">type_name</span></code>
is a proxy type. This type is implicitly convertible to the attribute type
via <code class="literal">get_expr<span class="emphasis"><em>N</em></span></code> and forwards assignment
to the underlying element via <code class="literal">set_expr<span class="emphasis"><em>N</em></span></code>.
The value type (that is the type returned by <a class="link" href="../iterator/metafunctions/value_of.html" title="value_of"><code class="computeroutput"><span class="identifier">result_of</span><span class="special">::</span><span class="identifier">value_of</span></code></a>, <a class="link" href="../sequence/intrinsic/metafunctions/value_at.html" title="value_at"><code class="computeroutput"><span class="identifier">result_of</span><span class="special">::</span><span class="identifier">value_at</span></code></a> and <a class="link" href="../sequence/intrinsic/metafunctions/value_at_c.html" title="value_at_c"><code class="computeroutput"><span class="identifier">result_of</span><span class="special">::</span><span class="identifier">value_at_c</span></code></a>) of the <span class="emphasis"><em>N</em></span>th
element is <code class="literal">attribute_type<span class="emphasis"><em>N</em></span></code> with const-qualifier
and reference removed.
</p>
<a name="fusion.adapted.adapt_adt.header"></a><h5>
Fusion: fixed yet another typo [SVN r65758]
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<a name="id1019157"></a>
Fusion: BOOST_FUSION_ADAPT_ADT documentation [SVN r65756]
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<a class="link" href="adapt_adt.html#fusion.adapted.adapt_adt.header">Header</a>
</h5>
<pre class="programlisting"><span class="preprocessor">#include</span> <span class="special">&lt;</span><span class="identifier">boost</span><span class="special">/</span><span class="identifier">fusion</span><span class="special">/</span><span class="identifier">adapted</span><span class="special">/</span><span class="identifier">adt</span><span class="special">/</span><span class="identifier">adapt_adt</span><span class="special">.</span><span class="identifier">hpp</span><span class="special">&gt;</span>
<span class="preprocessor">#include</span> <span class="special">&lt;</span><span class="identifier">boost</span><span class="special">/</span><span class="identifier">fusion</span><span class="special">/</span><span class="identifier">include</span><span class="special">/</span><span class="identifier">adapt_adt</span><span class="special">.</span><span class="identifier">hpp</span><span class="special">&gt;</span>
</pre>
<a name="fusion.adapted.adapt_adt.example"></a><h5>
Fusion: fixed yet another typo [SVN r65758]
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<a name="id1019272"></a>
Fusion: BOOST_FUSION_ADAPT_ADT documentation [SVN r65756]
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<a class="link" href="adapt_adt.html#fusion.adapted.adapt_adt.example">Example</a>
</h5>
<pre class="programlisting"><span class="keyword">namespace</span> <span class="identifier">demo</span>
<span class="special">{</span>
<span class="keyword">struct</span> <span class="identifier">employee</span>
<span class="special">{</span>
<span class="keyword">private</span><span class="special">:</span>
<span class="identifier">std</span><span class="special">::</span><span class="identifier">string</span> <span class="identifier">name</span><span class="special">;</span>
<span class="keyword">int</span> <span class="identifier">age</span><span class="special">;</span>
<span class="keyword">public</span><span class="special">:</span>
<span class="keyword">void</span> <span class="identifier">set_name</span><span class="special">(</span><span class="identifier">std</span><span class="special">::</span><span class="identifier">string</span> <span class="keyword">const</span><span class="special">&amp;</span> <span class="identifier">n</span><span class="special">)</span>
<span class="special">{</span>
<span class="identifier">name</span><span class="special">=</span><span class="identifier">n</span><span class="special">;</span>
<span class="special">}</span>
<span class="keyword">void</span> <span class="identifier">set_age</span><span class="special">(</span><span class="keyword">int</span> <span class="identifier">a</span><span class="special">)</span>
<span class="special">{</span>
<span class="identifier">age</span><span class="special">=</span><span class="identifier">a</span><span class="special">;</span>
<span class="special">}</span>
<span class="identifier">std</span><span class="special">::</span><span class="identifier">string</span> <span class="keyword">const</span><span class="special">&amp;</span> <span class="identifier">get_name</span><span class="special">()</span><span class="keyword">const</span>
<span class="special">{</span>
<span class="keyword">return</span> <span class="identifier">name</span><span class="special">;</span>
<span class="special">}</span>
<span class="keyword">int</span> <span class="identifier">get_age</span><span class="special">()</span><span class="keyword">const</span>
<span class="special">{</span>
<span class="keyword">return</span> <span class="identifier">age</span><span class="special">;</span>
<span class="special">}</span>
<span class="special">};</span>
<span class="special">}</span>
<span class="identifier">BOOST_FUSION_ADAPT_ADT</span><span class="special">(</span>
<span class="identifier">demo</span><span class="special">::</span><span class="identifier">employee</span><span class="special">,</span>
<span class="special">(</span><span class="identifier">std</span><span class="special">::</span><span class="identifier">string</span> <span class="keyword">const</span><span class="special">&amp;,</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">string</span> <span class="keyword">const</span><span class="special">&amp;,</span> <span class="identifier">obj</span><span class="special">.</span><span class="identifier">get_name</span><span class="special">(),</span> <span class="identifier">obj</span><span class="special">.</span><span class="identifier">set_name</span><span class="special">(</span><span class="identifier">val</span><span class="special">))</span>
<span class="special">(</span><span class="keyword">int</span><span class="special">,</span> <span class="keyword">int</span><span class="special">,</span> <span class="identifier">obj</span><span class="special">.</span><span class="identifier">get_age</span><span class="special">(),</span> <span class="identifier">obj</span><span class="special">.</span><span class="identifier">set_age</span><span class="special">(</span><span class="identifier">val</span><span class="special">)))</span>
<span class="identifier">demo</span><span class="special">::</span><span class="identifier">employee</span> <span class="identifier">e</span><span class="special">;</span>
<span class="identifier">front</span><span class="special">(</span><span class="identifier">e</span><span class="special">)=</span><span class="string">"Edward Norton"</span><span class="special">;</span>
<span class="identifier">back</span><span class="special">(</span><span class="identifier">e</span><span class="special">)=</span><span class="number">41</span><span class="special">;</span>
<span class="comment">//Prints 'Edward Norton is 41 years old'
</span><span class="identifier">std</span><span class="special">::</span><span class="identifier">cout</span> <span class="special">&lt;&lt;</span> <span class="identifier">e</span><span class="special">.</span><span class="identifier">get_name</span><span class="special">()</span> <span class="special">&lt;&lt;</span> <span class="string">" is "</span> <span class="special">&lt;&lt;</span> <span class="identifier">e</span><span class="special">.</span><span class="identifier">get_age</span><span class="special">()</span> <span class="special">&lt;&lt;</span> <span class="string">"years old"</span> <span class="special">&lt;&lt;</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">endl</span><span class="special">;</span>
</pre>
<a name="fusion.adapted.adapt_adt.see_also"></a><h5>
Fusion: fixed yet another typo [SVN r65758]
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<a name="id1019917"></a>
Fusion: BOOST_FUSION_ADAPT_ADT documentation [SVN r65756]
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<a class="link" href="adapt_adt.html#fusion.adapted.adapt_adt.see_also">See also</a>
</h5>
<p>
<a class="link" href="../notes.html#fusion.notes.adt_attribute_proxy"><code class="computeroutput"><span class="identifier">adt_attribute_proxy</span></code></a>
</p>
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Schwinger<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>)
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