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Boost.PythonHeader <boost/python/copy_non_const_reference.hpp> |
copy_non_const_reference
copy_non_const_reference
synopsis
copy_non_const_reference
metafunctions
copy_non_const_reference
copy_non_const_reference
is a model of ResultConverterGenerator which can be
used to wrap C++ functions returning a reference-to-non-const type such
that the referenced value is copied into a new Python object.
copy_non_const_reference
synopsisnamespace boost { namespace python { struct copy_non_const_reference { template <class T> struct apply; }; }}
copy_non_const_reference
metafunctionstemplate <class T> struct apply
C++ code:
#include <boost/python/module.hpp> #include <boost/python/class.hpp> #include <boost/python/copy_non_const_reference.hpp> #include <boost/python/return_value_policy.hpp> // classes to wrap struct Bar { int x; } struct Foo { Foo(int x) : { b.x = x; } Bar& get_bar() { return b; } private: Bar b; }; // Wrapper code using namespace boost::python; BOOST_PYTHON_MODULE_INIT(my_module) { module("my_module") .add( class_<Bar>() ) .add( class_<Foo>() .def_init(args<int>()) .def("get_bar", &Foo::get_bar , return_value_policy<copy_non_const_reference>()) ); }Python Code:
>>> from my_module import * >>> f = Foo(3) # create a Foo object >>> b = f.get_bar() # make a copy of the internal Bar object
Revised 05 November, 2001
© Copyright Dave Abrahams 2002. All Rights Reserved.