// 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)
#ifndef DEF_DWA200292_HPP
# define DEF_DWA200292_HPP

# include <boost/python/detail/prefix.hpp>

# include <boost/python/object_fwd.hpp>
# include <boost/python/make_function.hpp>
# include <boost/python/detail/def_helper.hpp>
# include <boost/python/detail/overloads_fwd.hpp>
# include <boost/python/scope.hpp>
# include <boost/python/signature.hpp>
# include <boost/python/detail/scope.hpp>

namespace boost { namespace python {

namespace detail
{
 namespace error
 {
 // Compile-time error messages
 template <bool> struct multiple_functions_passed_to_def;
 template <> struct multiple_functions_passed_to_def<false> { typedef char type; };
 }
 
 //
 // def_from_helper --
 //
 // Use a def_helper to define a regular wrapped function in the current scope.
 template <class F, class Helper>
 void def_from_helper(
 char const* name, F const& fn, Helper const& helper)
 {
 // Must not try to use default implementations except with method definitions.
 typedef typename error::multiple_functions_passed_to_def<
 Helper::has_default_implementation
 >::type assertion BOOST_ATTRIBUTE_UNUSED;
 
 detail::scope_setattr_doc(
 name, boost::python::make_function(
 fn
 , helper.policies()
 , helper.keywords())
 , helper.doc()
 );
 }

 //
 // These two overloads discriminate between def() as applied to
 // regular functions and def() as applied to the result of
 // BOOST_PYTHON_FUNCTION_OVERLOADS(). The final argument is used to
 // discriminate.
 //
 template <class Fn, class A1>
 void
 def_maybe_overloads(
 char const* name
 , Fn fn
 , A1 const& a1
 , ...)
 {
 detail::def_from_helper(name, fn, def_helper<A1>(a1));
 }

 template <class StubsT, class SigT>
 void def_maybe_overloads(
 char const* name
 , SigT sig
 , StubsT const& stubs
 , detail::overloads_base const*)
 {
 scope current;
 
 detail::define_with_defaults(
 name, stubs, current, detail::get_signature(sig));
 }

 template <class T>
 object make_function1(T fn, ...) { return make_function(fn); }

 inline
 object make_function1(object const& x, object const*) { return x; }
}

template <class Fn>
void def(char const* name, Fn fn)
{
 detail::scope_setattr_doc(name, detail::make_function1(fn, &fn), 0);
}

template <class Arg1T, class Arg2T>
void def(char const* name, Arg1T arg1, Arg2T const& arg2)
{
 detail::def_maybe_overloads(name, arg1, arg2, &arg2);
}

template <class F, class A1, class A2>
void def(char const* name, F f, A1 const& a1, A2 const& a2)
{
 detail::def_from_helper(name, f, detail::def_helper<A1,A2>(a1,a2));
}

template <class F, class A1, class A2, class A3>
void def(char const* name, F f, A1 const& a1, A2 const& a2, A3 const& a3)
{
 detail::def_from_helper(name, f, detail::def_helper<A1,A2,A3>(a1,a2,a3));
}

}} // namespace boost::python

#endif // DEF_DWA200292_HPP