Boost Python - Overloaded Functions with default arguments problem

Question

I have a class that has two functions, both of which take a different set of parameters and both of which have default arguments like so:

void PlaySound(const std::string &soundName, int channel = 0, bool UseStoredPath = true);

void PlaySound(FMOD::Sound* sound, int channel = 0);

I've found how to do default argument overloads from the tutorial here

http://www.boost.org/doc/libs/1_37_0/libs/python/doc/v2/overloads.html

as well as how to do function overloads taking different parameter types here

http://boost.2283326.n4.nabble.com/Boost-Python-def-and-member-function-overloads-td2659648.html

and I end up doing something like this...

BOOST_PYTHON_MEMBER_FUNCTION_OVERLOADS(PlaySoundFromFile, Engine::PlaySound, 1, 3)
BOOST_PYTHON_MODULE(EngineModule)
{
    class_<Engine>("Engine")
        //Sound
        .def("PlaySound", static_cast< void(Engine::*)(std::string, int, bool)>(&Engine::PlaySound));
}

The problem is I really have no idea how to use them together at the same time. I'd like to avoid having to change my base class function definitions.

Can someone who's done this before, or knows how to do this help me out?

Thanks in advance

Also see: stackoverflow.com/q/7577410/3233

Nick
– Nick

2012-03-23 10:32:33 +00:00
Commented Mar 23, 2012 at 10:32 — Nick
– Nick, Commented Mar 23, 2012 at 10:32
There is a good guide: Default Arguments in Boost::Python

Yantao Xie
– Yantao Xie

2015-07-08 01:13:00 +00:00
Commented Jul 8, 2015 at 1:13 — Yantao Xie
– Yantao Xie, Commented Jul 8, 2015 at 1:13

John Zwinck · Accepted Answer · 2011-06-12 01:36:03Z

11

This works for me:

BOOST_PYTHON_MEMBER_FUNCTION_OVERLOADS(
    PlaySoundFromFile, Engine::PlaySound, 1, 3)
BOOST_PYTHON_MEMBER_FUNCTION_OVERLOADS(
    PlaySoundFromFMOD, Engine::PlaySound, 1, 2)

BOOST_PYTHON_MODULE(EngineModule)
{
    class_<Engine>("Engine")
        .def("PlaySound", static_cast< void(Engine::*)
            (const std::string&, int, bool)>
            (&Engine::PlaySound), PlaySoundFromFile())
        .def("PlaySound", static_cast< void(Engine::*)
            (FMOD::Sound*, int)>
            (&Engine::PlaySound), PlaySoundFromFMOD())
    ;
}

The trick is that you need to tell each def() to use one of the overload specifiers (that seemed to be the biggest missing piece from what you had).

answered Jun 12, 2011 at 1:36

John Zwinck

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