//-----------------------------------------------------------------------------
// boost mpl/aux_/begin_end_impl.hpp header file
// See http://www.boost.org for updates, documentation, and revision history.
//-----------------------------------------------------------------------------
//
// Copyright (c) 2000-02
// Aleksey Gurtovoy
//
// Permission to use, copy, modify, distribute and sell this software
// and its documentation for any purpose is hereby granted without fee,
// provided that the above copyright notice appears in all copies and
// that both the copyright notice and this permission notice appear in
// supporting documentation. No representations are made about the
// suitability of this software for any purpose. It is provided "as is"
// without express or implied warranty.
#ifndef BOOST_MPL_AUX_BEGIN_END_IMPL_HPP_INCLUDED
#define BOOST_MPL_AUX_BEGIN_END_IMPL_HPP_INCLUDED
#include "boost/mpl/begin_end_fwd.hpp"
#include "boost/mpl/sequence_tag_fwd.hpp"
#include "boost/mpl/void.hpp"
#include "boost/mpl/aux_/traits_lambda_spec.hpp"
#include "boost/mpl/aux_/config/eti.hpp"
namespace boost {
namespace mpl {
// default implementation; conrete sequences might override it by
// specializing either the 'begin_traits/end_traits' or the primary
// 'begin/end' templates
template< typename Tag >
struct begin_traits
{
template< typename Sequence > struct algorithm
{
typedef typename Sequence::begin type;
};
};
template< typename Tag >
struct end_traits
{
template< typename Sequence > struct algorithm
{
typedef typename Sequence::end type;
};
};
// specialize 'begin_trait/end_trait' for two pre-defined tags
# define AUX_AGLORITM_TRAIT_SPEC(name, tag, result) \
template<> \
struct name##_traits<tag> \
{ \
template< typename Sequence > struct algorithm \
{ \
typedef result type; \
}; \
}; \
/**/
// a sequence with nested 'begin/end' typedefs; just query them
AUX_AGLORITM_TRAIT_SPEC(begin, nested_begin_end_tag, typename Sequence::begin)
AUX_AGLORITM_TRAIT_SPEC(end, nested_begin_end_tag, typename Sequence::end)
// if a type 'T' does not contain 'begin/end' or 'tag' members
// and doesn't specialize either 'begin/end' or 'begin_traits/end_traits'
// templates, then we end up here
AUX_AGLORITM_TRAIT_SPEC(begin, non_sequence_tag, void_)
AUX_AGLORITM_TRAIT_SPEC(end, non_sequence_tag, void_)
#if defined(BOOST_MPL_MSVC_ETI_BUG)
AUX_AGLORITM_TRAIT_SPEC(begin, int, int)
AUX_AGLORITM_TRAIT_SPEC(end, int, int)
#endif
# undef AUX_AGLORITM_TRAIT_SPEC
BOOST_MPL_ALGORITM_TRAITS_LAMBDA_SPEC(1,begin_traits)
BOOST_MPL_ALGORITM_TRAITS_LAMBDA_SPEC(1,end_traits)
} // namespace mpl
} // namespace boost
#endif // BOOST_MPL_AUX_BEGIN_END_IMPL_HPP_INCLUDED