// 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;

      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