...one of the most highly
regarded and expertly designed C++ library projects in the
world.
— Herb Sutter and Andrei
Alexandrescu, C++
Coding Standards
copy_const_reference
copy_const_reference
synopsiscopy_const_reference
metafunctionscopy_const_reference
copy_const_reference
is a model of ResultConverterGenerator
which can be used to wrap C++ functions returning a reference-to-const
type such that the referenced value is copied into a new Python
object.
copy_const_reference
synopsisnamespace boost { namespace python { struct copy_const_reference { template <class T> struct apply; }; }}
copy_const_reference
metafunctionstemplate <class T> struct apply
#include <boost/python/module.hpp> #include <boost/python/class.hpp> #include <boost/python/copy_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 const& get_bar() const { 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_const_reference>()) ; }
>>> 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.