// 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 IF_ELSE_DWA2002322_HPP# define IF_ELSE_DWA2002322_HPP# include <boost/config.hpp>namespace boost { namespace python { namespace detail { template <class T> struct elif_selected;template <class T>struct if_selected{    template <bool b>    struct elif : elif_selected<T>    {    };    template <class U>    struct else_    {        typedef T type;    };};# if defined(BOOST_MSVC) && (BOOST_MSVC == 1300)namespace msvc70_aux {template< bool > struct inherit_from{    template< typename T > struct result    {        typedef T type;    };};template<> struct inherit_from<true>{    template< typename T > struct result    {        struct type {};    };};template< typename T >struct never_true{    BOOST_STATIC_CONSTANT(bool, value = false);};} // namespace msvc70_aux#endif // # if defined(BOOST_MSVC) && (BOOST_MSVC == 1300)template <class T>struct elif_selected{# if !(defined(BOOST_MSVC) && BOOST_MSVC <= 1300 || defined(__MWERKS__) && __MWERKS__ <= 0x2407)    template <class U> class then;# elif defined(BOOST_MSVC) && (BOOST_MSVC == 1300)    template <class U>    struct then : msvc70_aux::inherit_from< msvc70_aux::never_true<U>::value >        ::template result< if_selected<T> >::type    {    };# else    template <class U>    struct then : if_selected<T>    {    };# endif };# if !(defined(BOOST_MSVC) && BOOST_MSVC <= 1300 || defined(__MWERKS__) && __MWERKS__ <= 0x2407)template <class T>template <class U>class elif_selected<T>::then : public if_selected<T>{};# endif template <bool b> struct if_{    template <class T>    struct then : if_selected<T>    {    };};struct if_unselected{    template <bool b> struct elif : if_<b>    {    };    template <class U>    struct else_    {        typedef U type;    };};template <>struct if_<false>{    template <class T>    struct then : if_unselected    {    };};}}} // namespace boost::python::detail#endif // IF_ELSE_DWA2002322_HPP