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Boost.PythonHeader <boost/python/return_by_value.hpp> |
return_by_valuereturn_by_value synopsisreturn_by_value metafunctionsreturn_by_valuereturn_by_value is a model of ResultConverterGenerator
which can be used to wrap C++ functions returning any reference or value
type such that the return value is copied into a new Python object.
return_by_value synopsis
namespace boost { namespace python
{
struct return_by_value
{
template <class T> struct apply;
};
}}
return_by_value metafunctionstemplate <class T> struct apply
#include <boost/python/module.hpp>
#include <boost/python/class.hpp>
#include <boost/python/return_by_value.hpp>
#include <boost/python/return_value_policy.hpp>
// classes to wrap
struct Bar { };
Bar global_bar;
// functions to wrap:
Bar b1();
Bar& b2();
Bar const& b3();
// Wrapper code
using namespace boost::python;
template <class R>
void def_void_function(char const* name, R (*f)())
{
def(name, f, return_value_policy<return_by_value>());
}
BOOST_PYTHON_MODULE(my_module)
{
class_<Bar>("Bar");
def_void_function("b1", b1);
def_void_function("b2", b2);
def_void_function("b3", b3);
}
>>> from my_module import * >>> b = b1() # each of these calls >>> b = b2() # creates a brand >>> b = b3() # new Bar object
Revised 13 November, 2002
© Copyright Dave Abrahams 2002.