1[section boost/python/call.hpp] 2[section Introduction] 3 <boost/python/call.hpp> defines the call family of overloaded function templates, used to invoke Python callable objects from C++. 4[endsect] 5[section Function `call`] 6`` 7template <class R, class A1, class A2, ... class An> 8R call(PyObject* callable, A1 const&, A2 const&, ... An const&) 9`` 10[variablelist 11[[Requires][R is a pointer type, reference type, or a complete type with an accessible copy constructor]] 12[[Effects][Invokes callable(a1, a2, ...an) in Python, where a1...an are the arguments to call(), converted to Python objects. ]] 13[[Returns][The result of the Python call, converted to the C++ type R.]] 14[[Rationale][For a complete semantic description and rationale, see this page. ]] 15] 16[endsect] 17[section Example] 18The following C++ function applies a Python callable object to its two arguments and returns the result. If a Python exception is raised or the result can't be converted to a double, an exception is thrown. 19`` 20double apply2(PyObject* func, double x, double y) 21{ 22 return boost::python::call<double>(func, x, y); 23} 24`` 25[endsect] 26[endsect] 27