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[SVN r13137]
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‎include/boost/python/converter/rvalue_from_python_chain.hpp‎

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// Copyright David Abrahams 2002. Permission to copy, use,
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// modify, sell and distribute this software is granted provided this
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// copyright notice appears in all copies. This software is provided
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// "as is" without express or implied warranty, and with no claim as
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// to its suitability for any purpose.
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#ifndef RVALUE_FROM_PYTHON_CHAIN_DWA200237_HPP
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# define RVALUE_FROM_PYTHON_CHAIN_DWA200237_HPP
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# include <boost/python/converter/registry.hpp>
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# include <boost/type_traits/transform_traits.hpp>
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# include <boost/type_traits/cv_traits.hpp>
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namespace boost { namespace python { namespace converter {
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namespace detail
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{
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template <class T>
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struct rvalue_from_python_chain_impl
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{
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static rvalue_from_python_registration*const& value;
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};
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template <class T>
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rvalue_from_python_registration*const& rvalue_from_python_chain_impl<T>::value
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= registry::rvalue_converters(undecorated_type_id<T>());
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}
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template <class T>
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struct rvalue_from_python_chain
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: detail::rvalue_from_python_chain_impl<
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typename add_reference<
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typename add_cv<T>::type
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>::type
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>
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{
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};
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}}} // namespace boost::python::converter
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#endif // RVALUE_FROM_PYTHON_CHAIN_DWA200237_HPP

‎test/callbacks.cpp‎

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// Copyright David Abrahams 2002. Permission to copy, use,
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// modify, sell and distribute this software is granted provided this
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// copyright notice appears in all copies. This software is provided
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// "as is" without express or implied warranty, and with no claim as
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// to its suitability for any purpose.
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#include <boost/python/module.hpp>
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#include <boost/python/returning.hpp>
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#include <boost/python/class.hpp>
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#include <boost/ref.hpp>
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using namespace boost::python;
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int apply_int_int(PyObject* f, int x)
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{
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return returning<int>::call(f, x);
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}
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void apply_void_int(PyObject* f, int x)
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{
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returning<void>::call(f, x);
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}
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struct X
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{
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explicit X(int x) : x(x), magic(7654321) { ++counter; }
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X(X const& rhs) : x(rhs.x), magic(7654321) { ++counter; }
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~X() { assert(magic == 7654321); magic = 6666666; x = 9999; --counter; }
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void set(int x) { assert(magic == 7654321); this->x = x; }
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int value() const { assert(magic == 7654321); return x; }
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static int count() { return counter; }
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private:
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void operator=(X const&);
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private:
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int x;
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long magic;
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static int counter;
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};
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X apply_X_X(PyObject* f, X x)
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{
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return returning<X>::call(f, x);
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}
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void apply_void_X_ref(PyObject* f, X x)
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{
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returning<X>::call(f, boost::ref(x));
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}
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int X::counter;
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BOOST_PYTHON_MODULE_INIT(callbacks_ext)
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{
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boost::python::module("callbacks_ext")
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.def("apply_int_int", apply_int_int)
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.def("apply_void_int", apply_void_int)
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.def("apply_X_X", apply_X_X)
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.def("apply_void_X_ref", apply_void_X_ref)
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.add(
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class_<X>("X")
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.def_init(args<int>())
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.def_init(args<X const&>())
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.def("value", &X::value)
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.def("set", &X::set)
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)
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.def("x_count", &X::count)
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;
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}
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‎test/callbacks.py‎

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'''
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>>> from callbacks_ext import *
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>>> def double(x):
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... return x + x
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...
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>>> apply_int_int(double, 42)
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84
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>>> apply_void_int(double, 42)
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>>> def identity(x):
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... return x
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>>> x = apply_X_X(identity, X(42))
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>>> x.value()
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42
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>>> x_count()
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1
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>>> del x
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>>> x_count()
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0
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>>> def increment(x):
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... x.set(x.value() + 1)
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...
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>>> x = X(42)
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>>> apply_void_X_ref(increment, x)
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>>> x.value()
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43
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'''
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def run(args = None):
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import sys
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import doctest
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if args is not None:
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sys.argv = args
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return doctest.testmod(sys.modules.get(__name__))
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if __name__ == '__main__':
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print "running..."
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import sys
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sys.exit(run()[0])

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