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Diffstat (limited to '3rdParty/Boost/src/boost/range/detail/extract_optional_type.hpp')
| -rwxr-xr-x | 3rdParty/Boost/src/boost/range/detail/extract_optional_type.hpp | 52 |
1 files changed, 52 insertions, 0 deletions
diff --git a/3rdParty/Boost/src/boost/range/detail/extract_optional_type.hpp b/3rdParty/Boost/src/boost/range/detail/extract_optional_type.hpp new file mode 100755 index 0000000..8292e34 --- /dev/null +++ b/3rdParty/Boost/src/boost/range/detail/extract_optional_type.hpp @@ -0,0 +1,52 @@ +// Boost.Range library +// +// Copyright Arno Schoedl & Neil Groves 2009. +// Use, modification and distribution is subject to 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) +// +// For more information, see http://www.boost.org/libs/range/ +// +#ifndef BOOST_RANGE_DETAIL_EXTRACT_OPTIONAL_TYPE_HPP_INCLUDED +#define BOOST_RANGE_DETAIL_EXTRACT_OPTIONAL_TYPE_HPP_INCLUDED + +#if defined(_MSC_VER) && (_MSC_VER >= 1200) +# pragma once +#endif + +#include <boost/config.hpp> + +#ifdef BOOST_NO_PARTIAL_TEMPLATE_SPECIALIZATION + +#define BOOST_RANGE_EXTRACT_OPTIONAL_TYPE( a_typedef ) \ + template< typename C > \ + struct extract_ ## a_typedef \ + { \ + typedef BOOST_DEDUCED_TYPENAME C::a_typedef type; \ + }; + +#else + +namespace boost { + namespace range_detail { + template< typename T > struct exists { typedef void type; }; + } +} + +// Defines extract_some_typedef<T> which exposes T::some_typedef as +// extract_some_typedef<T>::type if T::some_typedef exists. Otherwise +// extract_some_typedef<T> is empty. +#define BOOST_RANGE_EXTRACT_OPTIONAL_TYPE( a_typedef ) \ + template< typename C, typename Enable=void > \ + struct extract_ ## a_typedef \ + {}; \ + template< typename C > \ + struct extract_ ## a_typedef< C \ + , BOOST_DEDUCED_TYPENAME boost::range_detail::exists< BOOST_DEDUCED_TYPENAME C::a_typedef >::type \ + > { \ + typedef BOOST_DEDUCED_TYPENAME C::a_typedef type; \ + }; + +#endif + +#endif // include guard |