[C++-sig] Re: Parameter translation python, C++

Stefan Fleiter sf.lists at web.de
Wed Aug 13 17:31:35 CEST 2003


>>when I call a boost::python method from python
>>with a parameter of type float and there is only
>>a C++ Method with a parameter of type double
>>I get an "unidentifiable C++ exception".

>>void pybind(db::ExtCursor& cur, int column, float value)

Sorry, this is a double, I had two shells open and copied this from the 
working version.

> I can't believe your compiler lets you get away with this.
No, g++ 3.2.3 would not do that. :-)

>>     py::class_< db::ExtCursor, boost::noncopyable >("ExtCursor",
>>     py::init< db::Connection& >())
>>         .def("bind", bind4, "bind value to query")
>>self._cCursor.bind(0, 2.3) // _cCursor is db::ExtCursor

> Anyway, the exception is either:
> 1. Actually a crash (most likely in your code), if you're running on
>    windows.  Try #including libs/python/test/module_tail.cpp in your
>    module
I do run Linux.
I get the exception even if pybind is defined empty ( {} ).

> 2. A regular C++ exception thrown by your code for which you've not
>    installed a translator.
See above, an empty method can't throw an exception.

And last but not least:
If I change "double" to "float" everything is ok.


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