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/*********************************************************************
* Software License Agreement (BSD License)
*
* Copyright (c) 2014, Rice University.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* * Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* * Redistributions in binary form must reproduce the above
* copyright notice, this list of conditions and the following
* disclaimer in the documentation and/or other materials provided
* with the distribution.
* * Neither the name of the Rice University nor the names of its
* contributors may be used to endorse or promote products derived
* from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
* COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
* CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
* ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*********************************************************************/
/* Author: Alcides Viamontes Esquivel, Mark Moll */
/******************************************************************************
* How to wrap std::function objects with boost.python and use them both from
* C++ and Python.
*
* This is a significantly enhanced version of the original version by
* Alcides Viamontes Esquivel.
* See https://wiki.python.org/moin/boost.python/HowTo?action=AttachFile&do=get&target=py_boost_function.hpp
*
******************************************************************************
*
* Usage example:
*
* For the boost.python C++ module:
*
* ...
* #include "py_std_function.hpp"
* ...
*
* void module_greeter_f(std::string const& origin)
* {
* cout << "Hello world, by " << origin << endl;
* }
*
* BOOST_PYTHON_MODULE( foo ) {
*
* using namespace boost::python;
*
* def_function<void(std::string const&) >(
* "greeter_function_t",
* "A greeting function"
* );
*
* PY_REGISTER_FUNCTION(void(std::string const&),
* greeter_function_t, "Greeter function type")
* }
*
* From python code:
*
* - Invoke:
*
* >>> import foo
* >>> foo.module_greeter("world")
*
* - Create instances from python:
*
* >>> def my_greetings(hi):
* >>> ... print hi, ", world"
* >>> ...
* >>> grfunc = foo.greeter_function_t( my_greetings )
*
*/
#ifndef PY_BINDINGS_PY_STD_FUNCTION_
#define PY_BINDINGS_PY_STD_FUNCTION_
#include <functional>
#include <type_traits>
#include <boost/python.hpp>
namespace detail
{
template <typename T>
struct WrapType
{
using ArgType = typename std::conditional<std::is_pointer<T>::value || std::is_reference<T>::value,
T, T&>::type;
using ReturnType = typename std::conditional<std::is_same<T, ArgType>::value,
typename std::conditional<std::is_pointer<T>::value,
boost::python::pointer_wrapper<T>,
typename std::conditional<std::is_fundamental<std::decay_t<T>>::value,
std::remove_reference_t<T>,
boost::reference_wrapper<std::remove_reference_t<T>> >::type>::type,
T>::type;
static inline auto wrap(ArgType t)
{
return ReturnType(t);
}
};
template <typename FT>
struct PyobjectInvoker;
template <typename R, typename...Args>
struct PyobjectInvoker<R(Args...)>
{
PyobjectInvoker(boost::python::object o) : callable(o)
{
}
R operator()(Args... args)
{
PyGILState_STATE gstate = PyGILState_Ensure();
R result = boost::python::extract<R>(callable(WrapType<Args>::wrap(args)...));
PyGILState_Release(gstate);
return result;
}
boost::python::object callable;
};
template <typename...Args>
struct PyobjectInvoker<void(Args...)>
{
PyobjectInvoker(boost::python::object o) : callable(o)
{
}
void operator()(Args... args)
{
PyGILState_STATE gstate = PyGILState_Ensure();
callable(WrapType<Args>::wrap(args)...);
PyGILState_Release(gstate);
}
boost::python::object callable;
};
} // namespace detail
template <typename FT>
void def_function(const char *func_name, const char *func_doc)
{
BOOST_STATIC_ASSERT(std::is_function<FT>::value);
namespace bp = boost::python;
using function_t = std::function<FT>;
bp::class_<function_t>(func_name, func_doc, bp::no_init)
.def("__call__", &function_t::operator());
}
#define PYREGISTER_FUNCTION(FT, func_name, func_doc) \
BOOST_STATIC_ASSERT(std::is_function<FT>::value); \
boost::python::def(BOOST_PP_STRINGIZE(func_name), \
+[](boost::python::object o) -> std::function<FT> \
{ \
return detail::PyobjectInvoker<FT>(o); \
}, func_doc); \
def_function<FT>(BOOST_PP_STRINGIZE(func_name##_t), func_doc); \
boost::python::implicitly_convertible< \
boost::python::object, \
detail::PyobjectInvoker<FT>>();
#endif // PY_BINDINGS_PY_STD_FUNCTION_
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