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Enhance %extend to extend a class with template methods

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William S Fulton 2017-01-22 10:29:34 +00:00
commit b538070016
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Doc/Manual/SWIGPlus.html
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@ -3635,6 +3635,43 @@ This will generate two overloaded wrapper methods, the first will take a single
and the second will take two integer arguments.
</p>
<p>
It is even possible to extend a class via <tt>%extend</tt> with template methods, for example:
</p>
<div class="code">
<pre>
%include &lt;std_string.i&gt;
%inline %{
class ExtendMe {
public:
template &lt;typename T&gt;
T do_stuff_impl(int a, T b, double d) {
return b;
}
};
%}
%extend ExtendMe {
template&lt;typename T&gt;
T do_overloaded_stuff(T b) {
return $self-&gt;do_stuff_impl(0, b, 4.0);
}
}
%template(do_overloaded_stuff) ExtendMe::do_overloaded_stuff&lt;std::string&gt;;
%template(do_overloaded_stuff) ExtendMe::do_overloaded_stuff&lt;double&gt;;
</pre>
</div>
<p>
The wrapped <tt>ExtendMe</tt> class will then have two (overloaded) methods called <tt>do_overloaded_stuff</tt>.
</p>
<p>
<b>Compatibility Note</b>: Extending a class with template methods was added in version 3.0.12
</p>
<p>
Needless to say, SWIG's template support provides plenty of opportunities to
break the universe. That said, an important final point is that <b>SWIG does