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- [section boost/python/call.hpp]
- [section Introduction]
- <boost/python/call.hpp> defines the call family of overloaded function templates, used to invoke Python callable objects from C++.
- [endsect]
- [section Function `call`]
- ``
- template <class R, class A1, class A2, ... class An>
- R call(PyObject* callable, A1 const&, A2 const&, ... An const&)
- ``
- [variablelist
- [[Requires][R is a pointer type, reference type, or a complete type with an accessible copy constructor]]
- [[Effects][Invokes callable(a1, a2, ...an) in Python, where a1...an are the arguments to call(), converted to Python objects. ]]
- [[Returns][The result of the Python call, converted to the C++ type R.]]
- [[Rationale][For a complete semantic description and rationale, see this page. ]]
- ]
- [endsect]
- [section Example]
- The 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.
- ``
- double apply2(PyObject* func, double x, double y)
- {
- return boost::python::call<double>(func, x, y);
- }
- ``
- [endsect]
- [endsect]
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