def_abstract_functor.h

/*
    PyEO
    
    Copyright (C) 2003 Maarten Keijzer

    This program is free software; you can redistribute it and/or modify
    it under the terms of the GNU General Public License as published by
    the Free Software Foundation; either version 2 of the License, or
    (at your option) any later version.

    This program is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    GNU General Public License for more details.

    You should have received a copy of the GNU General Public License
    along with this program; if not, write to the Free Software
    Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
*/

#ifndef MAKE_ABSTRACT_FUNCTOR_H
#define MAKE_ABSTRACT_FUNCTOR_H

#include <eoFunctor.h>

// DEFINES for call 
#define WC1 boost::python::with_custodian_and_ward<1,2>()
#define WC2 boost::python::with_custodian_and_ward<1,2, with_custodian_and_ward<1,3> >()

namespace eoutils {

using namespace boost::python;
    
template <class Proc>
class ProcWrapper : public Proc
{
    public:
    PyObject* self;
    ProcWrapper(PyObject* s) : self(s) {}

    typename Proc::result_type operator()(void)
    {
        return boost::python::call_method<typename Proc::result_type>(self, "__call__");
    }
};

template <class Proc>
void make_abstract_functor(std::string name, typename eoFunctorBase::procedure_tag)
{
    typedef ProcWrapper<Proc> Wrapper;
    boost::python::class_<Proc, Wrapper,boost::noncopyable>(name.c_str(), boost::python::init<>() )
        .def("__call__", &Wrapper::operator());
}

template <class Proc>
void make_abstract_functor_ref(std::string name, typename eoFunctorBase::procedure_tag)
{
    typedef ProcWrapper<Proc> Wrapper;
    boost::python::class_<Proc, Wrapper,boost::noncopyable>(name.c_str(), boost::python::init<>() )
        .def("__call__", &Wrapper::operator(), boost::python::return_internal_reference<>());
}

template <class Unary>
class UnaryWrapper : public Unary
{
    public:
    PyObject* self;
    UnaryWrapper(PyObject* s) : self(s) {}

    typename Unary::result_type operator()(typename Unary::argument_type a) 
    { 
        return boost::python::call_method<typename Unary::result_type>(self, "__call__", boost::ref(a) ); 
    }
};

template <class Unary>
void make_abstract_functor(std::string name, typename eoFunctorBase::unary_function_tag)
{
    typedef UnaryWrapper<Unary> Wrapper;

    boost::python::class_<Unary, Wrapper, boost::noncopyable>(name.c_str(), boost::python::init<>() )
        .def("__call__", &Wrapper::operator())
        ;
}

template <class Unary>
void make_abstract_functor_ref(std::string name, typename eoFunctorBase::unary_function_tag)
{
    typedef UnaryWrapper<Unary> Wrapper;

    boost::python::class_<Unary, Wrapper, boost::noncopyable>(name.c_str(), boost::python::init<>() )
        .def("__call__", &Wrapper::operator(), boost::python::return_internal_reference<>() )
        ;
}

template <class Binary>
class BinaryWrapper : public Binary
{
    public:
    PyObject* self;
    BinaryWrapper(PyObject* s) : self(s) {}
    typename Binary::result_type operator()(typename Binary::first_argument_type a1, typename Binary::second_argument_type a2)
    {
        return boost::python::call_method<
            typename Binary::result_type>(self, "__call__", boost::ref(a1), boost::ref(a2) );
    }
};

template <class Binary>
void make_abstract_functor(std::string name, typename eoFunctorBase::binary_function_tag)
{
    typedef BinaryWrapper<Binary> Wrapper;
    boost::python::class_<Binary, Wrapper, boost::noncopyable>(name.c_str(), boost::python::init<>() )
        .def("__call__", &Wrapper::operator());
}

template <class Binary>
void make_abstract_functor_ref(std::string name, typename eoFunctorBase::binary_function_tag)
{
    typedef BinaryWrapper<Binary> Wrapper;
    boost::python::class_<Binary, Wrapper, boost::noncopyable>(name.c_str(), boost::python::init<>() )
        .def("__call__", &Wrapper::operator(), boost::python::return_internal_reference<>() );
}

}// namespace eoutils

template <class Functor>
void def_abstract_functor(std::string name)
{
    eoutils::make_abstract_functor<Functor>(name, Functor::functor_category());
}

template <class Functor>
void def_abstract_functor_ref(std::string name)
{
    eoutils::make_abstract_functor_ref<Functor>(name, Functor::functor_category());
}

#endif

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