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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
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<title>libsigc++ 2.0: compose()</title>
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<h1>compose()<br>
<small>
[<a class="el" href="group__adaptors.html">Adaptors</a>]</small>
</h1><a class="el" href="group__compose.html#ga2">sigc::compose()</a> combines two or three arbitrary functors.
<a href="#_details">More...</a><table border="0" cellpadding="0" cellspacing="0">
<tr><td></td></tr>
<tr><td colspan="2"><br><h2>Classes</h2></td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top">struct </td><td class="memItemRight" valign="bottom"><a class="el" href="structsigc_1_1compose1__functor.html">sigc::compose1_functor<T_setter, T_getter></a></td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">Adaptor that combines two functors. <a href="structsigc_1_1compose1__functor.html#_details">More...</a><br></td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top">struct </td><td class="memItemRight" valign="bottom"><a class="el" href="structsigc_1_1compose2__functor.html">sigc::compose2_functor<T_setter, T_getter1, T_getter2></a></td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">Adaptor that combines three functors. <a href="structsigc_1_1compose2__functor.html#_details">More...</a><br></td></tr>
<tr><td colspan="2"><br><h2>Functions</h2></td></tr>
<tr><td class="memTemplParams" nowrap colspan="2">template<class T_action, class T_setter, class T_getter> </td></tr>
<tr><td class="memTemplItemLeft" nowrap align="right" valign="top">void </td><td class="memTemplItemRight" valign="bottom"><a class="el" href="group__compose.html#ga0">sigc::visit_each</a> (const T_action& _A_action, const compose1_functor<T_setter, T_getter>& _A_target)</td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">Performs a functor on each of the targets of a functor. <a href="#ga0"></a><br></td></tr>
<tr><td class="memTemplParams" nowrap colspan="2">template<class T_action, class T_setter, class T_getter1, class T_getter2> </td></tr>
<tr><td class="memTemplItemLeft" nowrap align="right" valign="top">void </td><td class="memTemplItemRight" valign="bottom"><a class="el" href="group__compose.html#ga1">sigc::visit_each</a> (const T_action& _A_action, const compose2_functor<T_setter, T_getter1, T_getter2>& _A_target)</td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">Performs a functor on each of the targets of a functor. <a href="#ga1"></a><br></td></tr>
<tr><td class="memTemplParams" nowrap colspan="2">template<class T_setter, class T_getter> </td></tr>
<tr><td class="memTemplItemLeft" nowrap align="right" valign="top">compose1_functor< T_setter,<br>
T_getter > </td><td class="memTemplItemRight" valign="bottom"><a class="el" href="group__compose.html#ga2">sigc::compose</a> (const T_setter& _A_setter, const T_getter& _A_getter)</td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">Creates an adaptor of type <a class="el" href="structsigc_1_1compose1__functor.html">sigc::compose1_functor</a> which combines two functors. <a href="#ga2"></a><br></td></tr>
<tr><td class="memTemplParams" nowrap colspan="2">template<class T_setter, class T_getter1, class T_getter2> </td></tr>
<tr><td class="memTemplItemLeft" nowrap align="right" valign="top">compose2_functor< T_setter,<br>
T_getter1, T_getter2 > </td><td class="memTemplItemRight" valign="bottom"><a class="el" href="group__compose.html#ga3">sigc::compose</a> (const T_setter& _A_setter, const T_getter1& _A_getter1, const T_getter2& _A_getter2)</td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">Creates an adaptor of type <a class="el" href="structsigc_1_1compose2__functor.html">sigc::compose2_functor</a> which combines three functors. <a href="#ga3"></a><br></td></tr>
</table>
<hr><a name="_details"></a><h2>Detailed Description</h2>
<a class="el" href="group__compose.html#ga2">sigc::compose()</a> combines two or three arbitrary functors.
<p>
On invokation parameters are passed on to one or two getter functor(s). The return value(s) are then passed on to the setter function.<p>
<dl compact><dt><b>Examples:</b></dt><dd><div class="fragment"><pre class="fragment"> <span class="keywordtype">float</span> square_root(<span class="keywordtype">float</span> a) { <span class="keywordflow">return</span> sqrtf(a); }
<span class="keywordtype">float</span> sum(<span class="keywordtype">float</span> a, <span class="keywordtype">float</span> b) { <span class="keywordflow">return</span> a+b; }
std::cout << <a class="code" href="group__compose.html#ga2">sigc::compose</a>(&square_root, &sum)(9, 16); <span class="comment">// calls square_root(sum(3,6))</span>
std::cout << <a class="code" href="group__compose.html#ga2">sigc::compose</a>(&sum, &square_root, &square_root)(9); <span class="comment">// calls sum(square_root(9), square_root(9))</span>
</pre></div></dd></dl>
The functor <a class="el" href="group__compose.html#ga2">sigc::compose()</a> returns can be passed into <a class="el" href="classsigc_1_1signal7.html#a0">sigc::signal::connect()</a> directly.<p>
<dl compact><dt><b>Example:</b></dt><dd><div class="fragment"><pre class="fragment"> <a class="code" href="classsigc_1_1signal.html">sigc::signal<float,float,float></a> some_signal;
some_signal.<a class="code" href="classsigc_1_1signal7.html#a0">connect</a>(sigc::compose(&square_root, &sum));
</pre></div></dd></dl>
For a more powerful version of this functionality see the lambda library adaptor <a class="el" href="namespacesigc.html#a44">sigc::group()</a> which can bind, hide and reorder arguments arbitrarily. Although <a class="el" href="namespacesigc.html#a44">sigc::group()</a> is more flexible, <a class="el" href="group__bind.html#ga8">sigc::bind()</a> provides a means of binding parameters when then total number of parameters called is variable. <hr><h2>Function Documentation</h2>
<a class="anchor" name="ga3" doxytag="sigc::compose"></a><p>
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template <class T_setter, class T_getter1, class T_getter2> </td>
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<td class="md" nowrap valign="top">compose2_functor<T_setter, T_getter1, T_getter2> compose </td>
<td class="md" valign="top">(</td>
<td class="md" nowrap valign="top">const T_setter& </td>
<td class="mdname" nowrap> <em>_A_setter</em>, </td>
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<td class="md" nowrap align="right"></td>
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<td class="md" nowrap>const T_getter1& </td>
<td class="mdname" nowrap> <em>_A_getter1</em>, </td>
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<td class="md" nowrap align="right"></td>
<td class="md"></td>
<td class="md" nowrap>const T_getter2& </td>
<td class="mdname" nowrap> <em>_A_getter2</em></td>
</tr>
<tr>
<td class="md"></td>
<td class="md">) </td>
<td class="md" colspan="2"><code> [inline]</code></td>
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<p>
Creates an adaptor of type <a class="el" href="structsigc_1_1compose2__functor.html">sigc::compose2_functor</a> which combines three functors.
<p>
<dl compact><dt><b>Parameters:</b></dt><dd>
<table border="0" cellspacing="2" cellpadding="0">
<tr><td valign="top"></td><td valign="top"><em>_A_setter</em> </td><td>Functor that receives the return values of the invokation of <em>_A_getter1</em> and <em>_A_getter2</em>. </td></tr>
<tr><td valign="top"></td><td valign="top"><em>_A_getter1</em> </td><td>Functor to invoke from operator()(). </td></tr>
<tr><td valign="top"></td><td valign="top"><em>_A_getter2</em> </td><td>Functor to invoke from operator()(). </td></tr>
</table>
</dl>
<dl compact><dt><b>Returns:</b></dt><dd>Adaptor that executes <em>_A_setter</em> with the values return from invokation of <em>_A_getter1</em> and <em>_A_getter2</em>. </dd></dl>
</td>
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<a class="anchor" name="ga2" doxytag="sigc::compose"></a><p>
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template <class T_setter, class T_getter> </td>
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<td class="md" nowrap valign="top">compose1_functor<T_setter, T_getter> compose </td>
<td class="md" valign="top">(</td>
<td class="md" nowrap valign="top">const T_setter& </td>
<td class="mdname" nowrap> <em>_A_setter</em>, </td>
</tr>
<tr>
<td class="md" nowrap align="right"></td>
<td class="md"></td>
<td class="md" nowrap>const T_getter& </td>
<td class="mdname" nowrap> <em>_A_getter</em></td>
</tr>
<tr>
<td class="md"></td>
<td class="md">) </td>
<td class="md" colspan="2"><code> [inline]</code></td>
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<p>
Creates an adaptor of type <a class="el" href="structsigc_1_1compose1__functor.html">sigc::compose1_functor</a> which combines two functors.
<p>
<dl compact><dt><b>Parameters:</b></dt><dd>
<table border="0" cellspacing="2" cellpadding="0">
<tr><td valign="top"></td><td valign="top"><em>_A_setter</em> </td><td>Functor that receives the return value of the invokation of <em>_A_getter</em>. </td></tr>
<tr><td valign="top"></td><td valign="top"><em>_A_getter</em> </td><td>Functor to invoke from operator()(). </td></tr>
</table>
</dl>
<dl compact><dt><b>Returns:</b></dt><dd>Adaptor that executes <em>_A_setter</em> with the value returned from invokation of <em>_A_getter</em>. </dd></dl>
</td>
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<a class="anchor" name="ga1" doxytag="sigc::visit_each"></a><p>
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template <class T_action, class T_setter, class T_getter1, class T_getter2> </td>
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<td class="md" nowrap valign="top">void visit_each </td>
<td class="md" valign="top">(</td>
<td class="md" nowrap valign="top">const T_action& </td>
<td class="mdname" nowrap> <em>_A_action</em>, </td>
</tr>
<tr>
<td class="md" nowrap align="right"></td>
<td class="md"></td>
<td class="md" nowrap>const compose2_functor<T_setter, T_getter1, T_getter2>& </td>
<td class="mdname" nowrap> <em>_A_target</em></td>
</tr>
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<td class="md"></td>
<td class="md">) </td>
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<p>
Performs a functor on each of the targets of a functor.
<p>
The function overload for <a class="el" href="structsigc_1_1compose2__functor.html">sigc::compose2_functor</a> performs a functor on the functors stored in the <a class="el" href="structsigc_1_1compose2__functor.html">sigc::compose2_functor</a> object. </td>
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<a class="anchor" name="ga0" doxytag="sigc::visit_each"></a><p>
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template <class T_action, class T_setter, class T_getter> </td>
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<td class="md" nowrap valign="top">void visit_each </td>
<td class="md" valign="top">(</td>
<td class="md" nowrap valign="top">const T_action& </td>
<td class="mdname" nowrap> <em>_A_action</em>, </td>
</tr>
<tr>
<td class="md" nowrap align="right"></td>
<td class="md"></td>
<td class="md" nowrap>const compose1_functor<T_setter, T_getter>& </td>
<td class="mdname" nowrap> <em>_A_target</em></td>
</tr>
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<td class="md"></td>
<td class="md">) </td>
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<td>
<p>
Performs a functor on each of the targets of a functor.
<p>
The function overload for <a class="el" href="structsigc_1_1compose1__functor.html">sigc::compose1_functor</a> performs a functor on the functors stored in the <a class="el" href="structsigc_1_1compose1__functor.html">sigc::compose1_functor</a> object. </td>
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