141 lines
3.3 KiB
C++
141 lines
3.3 KiB
C++
// Boost.Bimap
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//
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// Copyright (c) 2006-2007 Matias Capeletto
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//
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// Distributed under the Boost Software License, Version 1.0.
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// (See 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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/// \file relation/support/get.hpp
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/// \brief get<tag>(r) function
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#ifndef BOOST_BIMAP_RELATION_SUPPORT_GET_HPP
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#define BOOST_BIMAP_RELATION_SUPPORT_GET_HPP
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#if defined(_MSC_VER)
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#pragma once
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#endif
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#include <boost/config.hpp>
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#include <boost/bimap/relation/support/value_type_of.hpp>
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#include <boost/bimap/relation/detail/access_builder.hpp>
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#include <boost/mpl/if.hpp>
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#include <boost/type_traits/is_same.hpp>
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#include <boost/type_traits/is_const.hpp>
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#ifdef BOOST_BIMAP_ONLY_DOXYGEN_WILL_PROCESS_THE_FOLLOWING_LINES
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namespace boost {
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namespace bimaps {
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namespace relation {
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namespace support {
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/** \brief Gets a pair view of the relation.
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\ingroup relation_group
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**/
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template< class Tag, class SymmetricType >
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BOOST_DEDUCED_TYPENAME result_of::get<Tag,SymmetricType>::type
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get( SymmetricType & );
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} // namespace support
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} // namespace relation
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} // namespace bimaps
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} // namespace boost
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#endif // BOOST_BIMAP_ONLY_DOXYGEN_WILL_PROCESS_THE_FOLLOWING_LINES
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#ifndef BOOST_BIMAP_DOXYGEN_WILL_NOT_PROCESS_THE_FOLLOWING_LINES
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namespace boost {
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namespace bimaps {
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namespace relation {
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namespace support {
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// Since it is very error-prone to directly write the hole bunch
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// of relation accesor. They are built from little macro blocks that
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// are both more readable, leading to self docummenting code and a
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// lot more easier to understand and maintain.
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// It is very important to note that the three building blocks have
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// to laid in the same namespace in order to work. There is also
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// important to keep them in order.
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// The forward declaration are not necessary but they help a lot to
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// the reader, as they undercover what is the signature of the
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// result code.
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// In the end, it is not quicker to do it in this way because you
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// write a lot. But this code has no complexity at all and almost
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// every word writed is for documentation.
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// Result of
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// -------------------------------------------------------------------------
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/*
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namespace result_of {
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template< class Tag, class Relation >
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struct get<Tag,Relation>;
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{
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typedef -unspecified- type;
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};
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} // namespace result_of
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*/
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BOOST_BIMAP_SYMMETRIC_ACCESS_RESULT_OF_BUILDER
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(
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get,
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value_type_of
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)
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// Implementation
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// -------------------------------------------------------------------------
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BOOST_BIMAP_SYMMETRIC_ACCESS_IMPLEMENTATION_BUILDER
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(
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get,
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SymmetricType,
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st,
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return st.get_left(),
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return st.get_right()
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)
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namespace detail {
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template< class SymmetricType >
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BOOST_DEDUCED_TYPENAME result_of::get<
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::boost::bimaps::relation::member_at::info, SymmetricType >::type
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get(::boost::bimaps::relation::member_at::info, SymmetricType & rel)
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{
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return rel.info;
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}
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} // namespace detail
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// Interface
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//----------------------------------------------------------------------------
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BOOST_BIMAP_SYMMETRIC_ACCESS_INTERFACE_BUILDER
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(
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get
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)
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} // namespace support
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} // namespace relation
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} // namespace bimaps
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} // namespace boost
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#endif // BOOST_BIMAP_DOXYGEN_WILL_NOT_PROCESS_THE_FOLLOWING_LINES
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#endif // BOOST_BIMAP_RELATION_SUPPORT_GET_HPP
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