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