Chris@16: // Copyright David Abrahams 2002.
Chris@16: // Distributed under the Boost Software License, Version 1.0. (See
Chris@16: // accompanying file LICENSE_1_0.txt or copy at
Chris@16: // http://www.boost.org/LICENSE_1_0.txt)
Chris@16: #ifndef IF_ELSE_DWA2002322_HPP
Chris@16: # define IF_ELSE_DWA2002322_HPP
Chris@16: # include <boost/config.hpp>
Chris@16: 
Chris@16: namespace boost { namespace python { namespace detail { 
Chris@16: 
Chris@16: template <class T> struct elif_selected;
Chris@16: 
Chris@16: template <class T>
Chris@16: struct if_selected
Chris@16: {
Chris@16:     template <bool b>
Chris@16:     struct elif : elif_selected<T>
Chris@16:     {
Chris@16:     };
Chris@16: 
Chris@16:     template <class U>
Chris@16:     struct else_
Chris@16:     {
Chris@16:         typedef T type;
Chris@16:     };
Chris@16: };
Chris@16: 
Chris@16: # if defined(BOOST_MSVC) && (BOOST_MSVC == 1300)
Chris@16: namespace msvc70_aux {
Chris@16: 
Chris@16: template< bool > struct inherit_from
Chris@16: {
Chris@16:     template< typename T > struct result
Chris@16:     {
Chris@16:         typedef T type;
Chris@16:     };
Chris@16: };
Chris@16: 
Chris@16: template<> struct inherit_from<true>
Chris@16: {
Chris@16:     template< typename T > struct result
Chris@16:     {
Chris@16:         struct type {};
Chris@16:     };
Chris@16: };
Chris@16: 
Chris@16: template< typename T >
Chris@16: struct never_true
Chris@16: {
Chris@16:     BOOST_STATIC_CONSTANT(bool, value = false);
Chris@16: };
Chris@16: 
Chris@16: } // namespace msvc70_aux
Chris@16: 
Chris@16: #endif // # if defined(BOOST_MSVC) && (BOOST_MSVC == 1300)
Chris@16: 
Chris@16: template <class T>
Chris@16: struct elif_selected
Chris@16: {
Chris@16: # if !(defined(BOOST_MSVC) && BOOST_MSVC <= 1300 || defined(__MWERKS__) && __MWERKS__ <= 0x2407)
Chris@16:     template <class U> class then;
Chris@16: # elif defined(BOOST_MSVC) && (BOOST_MSVC == 1300)
Chris@16:     template <class U>
Chris@16:     struct then : msvc70_aux::inherit_from< msvc70_aux::never_true<U>::value >
Chris@16:         ::template result< if_selected<T> >::type
Chris@16:     {
Chris@16:     };
Chris@16: # else
Chris@16:     template <class U>
Chris@16:     struct then : if_selected<T>
Chris@16:     {
Chris@16:     };
Chris@16: # endif 
Chris@16: };
Chris@16: 
Chris@16: # if !(defined(BOOST_MSVC) && BOOST_MSVC <= 1300 || defined(__MWERKS__) && __MWERKS__ <= 0x2407)
Chris@16: template <class T>
Chris@16: template <class U>
Chris@16: class elif_selected<T>::then : public if_selected<T>
Chris@16: {
Chris@16: };
Chris@16: # endif 
Chris@16: 
Chris@16: template <bool b> struct if_
Chris@16: {
Chris@16:     template <class T>
Chris@16:     struct then : if_selected<T>
Chris@16:     {
Chris@16:     };
Chris@16: };
Chris@16: 
Chris@16: struct if_unselected
Chris@16: {
Chris@16:     template <bool b> struct elif : if_<b>
Chris@16:     {
Chris@16:     };
Chris@16: 
Chris@16:     template <class U>
Chris@16:     struct else_
Chris@16:     {
Chris@16:         typedef U type;
Chris@16:     };
Chris@16: };
Chris@16: 
Chris@16: template <>
Chris@16: struct if_<false>
Chris@16: {
Chris@16:     template <class T>
Chris@16:     struct then : if_unselected
Chris@16:     {
Chris@16:     };
Chris@16: };
Chris@16: 
Chris@16: }}} // namespace boost::python::detail
Chris@16: 
Chris@16: #endif // IF_ELSE_DWA2002322_HPP