Question

I have templated function connect:

template<class InstanceClass>
CL_Slot connect (InstanceClass *instance, void(InstanceClass::*function)(Param1, Param2))

It connects for some signal passed function from InstanceClass.

In my example, I want to connect some of classes for the keyboard event (KeyDown).
In c++ I write:

get_signal_object().connect(&SomeClass::func);

But I have to use this function in python-script with exporting from c++ code (using boost.python).

As I know, to export template I have to export it passing any used type. But in python I’ll pass classes which exist only in python-namespace.

So, any ideas how to use that function templated in python?

Answer 1

Why don’t you just add

extern template<>
    CL_Slot connect<SomeClass> (SomeClass *instance, void(InstanceClass::*function)(Param1, Param2));

note: extern might need to after template<> — don’t remember

If you must have C linkage add a wrapper function (it will inline the templated function).

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Note: MSVC has nonstandard template export facilities

c++0x has upcoming support for extern templates: http://en.wikipedia.org/wiki/C%2B%2B0x#Extern_template