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Better clarification about polymorphic wrappers for function objects - std::function

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William S Fulton 2013-02-01 19:17:21 +00:00
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Doc/Manual/Cpp0x.html
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@ -735,14 +735,32 @@ int main() {
<H3><a name="Cpp0x_Polymorphous_wrappers_for_function_objects"></a>7.3.7 Polymorphous wrappers for function objects</H3>
<p>SWIG fully supports function template wrappers and function objects:</p>
<p>
SWIG supports functor classes in some languages in a very natural way.
However nothing is provided yet for the new <tt>std::function</tt> template.
SWIG will parse usage of the template like any other template.
</p>
<div class="code"><pre>
function&lt;int ( int, int )&gt; pF; // function template wrapper
%rename(__call__) Test::operator(); // Default renaming used for Python
struct Test {
bool operator()( short x, short y ); // function object
bool operator()(int x, int y); // function object
};
#include &lt;functional&gt;
std::function&lt;void (int, int)&gt; pF = Test; // function template wrapper
</pre></div>
<p>
Example of supported usage of the plain functor from Python is shown below.
It does not involve <tt>std::function</tt>.
</p>
<div class="targetlang">
t = Test()
b = t(1,2) # invoke C++ function object
</pre></div>
<H3><a name="Cpp0x_Type_traits_for_metaprogramming"></a>7.3.8 Type traits for metaprogramming</H3>