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Boost.PythonHeader <boost/python/copy_non_const_reference.hpp> |
copy_non_const_referencecopy_non_const_reference synopsiscopy_non_const_reference metafunctionscopy_non_const_referencecopy_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 synopsis
namespace 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(my_module)
{
class_<Bar>("Bar");
class_<Foo>("Foo", init<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 13 November, 2002
© Copyright Dave Abrahams 2002.