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