Armel Asselin wrote: >> I have a strange problem with recent g++ while trying to get a pointer >> on an overloaded function. >> >> To extract one specific version of the overloaded function I tried : >> >> float ( *v2d_cross )( const Vector2& , const Vector2& ) = cross; >> >> But then I get this error: >> >> src/wrappers/export_vertex.cpp|120| error: no matches converting >> function 'cross' to type 'float (*)(const class Vector2&, const class >> Vector2&)' >> src/utils/amap_util_vector.h|236| error: candidates are: float >> cross(const Vector2&, const Vector2&) >> src/utils/amap_util_vector.h|514| error: Vector3 >> cross(const Vector3&, const Vector3&) > > don't know if you could ever get that to work, but at least i'm sure it does > not work with most c++ compilers: there is no selection of a function > through a 'to-be-casted-to' rule, to use pointers to members/pointers to > function, you must have different names: you cannot 'overload'. Calling > directly disambiguates/works because you have tangible argument to > disambiguate. But casting does not give these arguments so the compiler > cannot choose. > > Armel > >
However, that's the recommended way to do for Boost.Python overloading : http://boost.org/libs/python/doc/tutorial/doc/html/python/functions.html#python.overloading And I used it for more than two years without problem. Furthermore, according to the ISO standard C++ (ยง13.4 - Address of an overloaded function): "A use of an overloaded function name without arguments is resolved in certain contexts to a function, a pointer to function or a pointer to member function for a specific function from the overload set. A func- tion template name is considered to name a set of overloaded functions in such contexts. The function selected is the one whose type matches the target type required in the context. The target can be [...] an explicit type conversion." So, as far as I understand it should work, isn't it ? Pierre _______________________________________________ help-gplusplus mailing list help-gplusplus@gnu.org http://lists.gnu.org/mailman/listinfo/help-gplusplus
