Chris@16: // Copyright David Abrahams 2004. Distributed under the Boost
Chris@16: // Software License, Version 1.0. (See accompanying
Chris@16: // file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
Chris@16: #ifndef ENABLE_IF_DWA2004722_HPP
Chris@16: # define ENABLE_IF_DWA2004722_HPP
Chris@16: 
Chris@16: # include <boost/python/detail/sfinae.hpp>
Chris@16: # include <boost/detail/workaround.hpp>
Chris@16: 
Chris@16: # if BOOST_WORKAROUND(BOOST_MSVC, <= 1300)
Chris@16: #  include <boost/mpl/if.hpp>
Chris@16: 
Chris@16: namespace boost { namespace python { namespace detail { 
Chris@16: 
Chris@16: template <class T> struct always_void { typedef void type; };
Chris@16: 
Chris@16: template <class C, class T = int>
Chris@16: struct enable_if_arg
Chris@16: {
Chris@16:     typedef typename mpl::if_<C,T,int&>::type type;
Chris@16: };
Chris@16:              
Chris@16: template <class C, class T = int>
Chris@16: struct disable_if_arg
Chris@16: {
Chris@16:     typedef typename mpl::if_<C,int&,T>::type type;
Chris@16: };
Chris@16:              
Chris@16: template <class C, class T = typename always_void<C>::type>
Chris@16: struct enable_if_ret
Chris@16: {
Chris@16:     typedef typename mpl::if_<C,T,int[2]>::type type;
Chris@16: };
Chris@16:              
Chris@16: template <class C, class T = typename always_void<C>::type>
Chris@16: struct disable_if_ret
Chris@16: {
Chris@16:     typedef typename mpl::if_<C,int[2],T>::type type;
Chris@16: };
Chris@16:              
Chris@16: }}} // namespace boost::python::detail
Chris@16: 
Chris@16: # elif !defined(BOOST_NO_SFINAE)
Chris@16: #  include <boost/utility/enable_if.hpp>
Chris@16: 
Chris@16: namespace boost { namespace python { namespace detail { 
Chris@16: 
Chris@16: template <class C, class T = int>
Chris@16: struct enable_if_arg
Chris@16:   : enable_if<C,T>
Chris@16: {};
Chris@16:              
Chris@16: template <class C, class T = int>
Chris@16: struct disable_if_arg
Chris@16:   : disable_if<C,T>
Chris@16: {};
Chris@16:              
Chris@16: template <class C, class T = void>
Chris@16: struct enable_if_ret
Chris@16:   : enable_if<C,T>
Chris@16: {};
Chris@16:              
Chris@16: template <class C, class T = void>
Chris@16: struct disable_if_ret
Chris@16:   : disable_if<C,T>
Chris@16: {};
Chris@16:              
Chris@16: }}} // namespace boost::python::detail
Chris@16: 
Chris@16: # endif
Chris@16: 
Chris@16: #endif // ENABLE_IF_DWA2004722_HPP