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// Copyright David Abrahams 2002.
// Distributed under the Boost Software License, Version 1.0. (See
// accompanying file LICENSE_1_0.txt or copy at
// http://www.boost.org/LICENSE_1_0.txt)
#include <boost/python/class.hpp>
#include <boost/python/module.hpp>
#include <boost/python/def.hpp>
#include <boost/python/has_back_reference.hpp>
#include <boost/python/back_reference.hpp>
#include <boost/ref.hpp>
#include <boost/utility.hpp>
#include <memory>
#define BOOST_ENABLE_ASSERT_HANDLER
#include <boost/assert.hpp>
#include <boost/python/copy_const_reference.hpp>
#include <boost/python/return_value_policy.hpp>
#include <boost/mpl/bool.hpp>
// This test shows that a class can be wrapped "as itself" but also
// acquire a back-reference iff has_back_reference<> is appropriately
// specialized.
using namespace boost::python;
struct X
{
explicit X(int x) : x(x), magic(7654321) { ++counter; }
X(X const& rhs) : x(rhs.x), magic(7654321) { ++counter; }
virtual ~X() { BOOST_ASSERT(magic == 7654321); magic = 6666666; x = 9999; --counter; }
void set(int _x) { BOOST_ASSERT(magic == 7654321); this->x = _x; }
int value() const { BOOST_ASSERT(magic == 7654321); return x; }
static int count() { return counter; }
private:
void operator=(X const&);
private:
int x;
long magic;
static int counter;
};
int X::counter;
struct Y : X
{
Y(PyObject* self, int x) : X(x), self(self) {}
Y(PyObject* self, Y const& rhs) : X(rhs), self(self) {}
private:
Y(Y const&);
PyObject* self;
};
struct Z : X
{
Z(PyObject* self, int x) : X(x), self(self) {}
Z(PyObject* self, Z const& rhs) : X(rhs), self(self) {}
private:
Z(Z const&);
PyObject* self;
};
Y const& copy_Y(Y const& y) { return y; }
Z const& copy_Z(Z const& z) { return z; }
namespace boost { namespace python
{
template <>
struct has_back_reference<Y>
: mpl::true_
{
};
template <>
struct has_back_reference<Z>
: mpl::true_
{
};
}}
// prove that back_references get initialized with the right PyObject*
object y_identity(back_reference<Y const&> y)
{
return y.source();
}
// prove that back_references contain the right value
bool y_equality(back_reference<Y const&> y1, Y const& y2)
{
return &y1.get() == &y2;
}
BOOST_PYTHON_MODULE(back_reference_ext)
{
def("copy_Y", copy_Y, return_value_policy<copy_const_reference>());
def("copy_Z", copy_Z, return_value_policy<copy_const_reference>());
def("x_instances", &X::count);
class_<Y>("Y", init<int>())
.def("value", &Y::value)
.def("set", &Y::set)
;
class_<Z,std::auto_ptr<Z> >("Z", init<int>())
.def("value", &Z::value)
.def("set", &Z::set)
;
def("y_identity", y_identity);
def("y_equality", y_equality);
}
#include "module_tail.cpp"
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