// Boost.Bimap | |
// | |
// Copyright (c) 2006-2007 Matias Capeletto | |
// | |
// 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) | |
/// \file relation/support/value_type_of.hpp | |
/// \brief value_type_of<tag,relation> metafunction | |
#ifndef BOOST_BIMAP_RELATION_SUPPORT_VALUE_TYPE_OF_HPP | |
#define BOOST_BIMAP_RELATION_SUPPORT_VALUE_TYPE_OF_HPP | |
#if defined(_MSC_VER) && (_MSC_VER>=1200) | |
#pragma once | |
#endif | |
#include <boost/config.hpp> | |
#include <boost/bimap/relation/detail/metadata_access_builder.hpp> | |
/** \struct boost::bimaps::relation::support::value_type_of | |
\brief Metafunction to obtain the value type of one of the sides. | |
\code | |
template< class Tag, class Relation > | |
struct value_type_of | |
{ | |
typedef typename Relation::{side}_type type; | |
}; | |
\endcode | |
See also member_at, get(). | |
\ingroup relation_group | |
**/ | |
namespace boost { | |
namespace bimaps { | |
namespace relation { | |
namespace support { | |
// Metafunction value_type_of | |
/* | |
template< class Tag, class Relation > | |
struct value_type_of | |
{ | |
typedef -unspecified- type; | |
}; | |
*/ | |
BOOST_BIMAP_SYMMETRIC_METADATA_ACCESS_BUILDER | |
( | |
value_type_of, | |
left_value_type, | |
right_value_type | |
) | |
// Add support for info tags to value_type_of | |
template< class Tag, class SymmetricType > | |
struct value_type_of | |
< | |
Tag, SymmetricType, | |
BOOST_DEDUCED_TYPENAME enable_if | |
< | |
::boost::bimaps::relation::support::is_tag_of_member_at_info | |
< | |
Tag, | |
SymmetricType | |
> | |
>::type | |
> | |
{ | |
typedef BOOST_DEDUCED_TYPENAME SymmetricType::info_type type; | |
}; | |
} // namespace support | |
} // namespace relation | |
} // namespace bimaps | |
} // namespace boost | |
#endif // BOOST_BIMAP_RELATION_SUPPORT_VALUE_TYPE_OF_HPP | |