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/src/contrib/boost/mpl/is_sequence.hpp

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  1
  2#ifndef BOOST_MPL_IS_SEQUENCE_HPP_INCLUDED
  3#define BOOST_MPL_IS_SEQUENCE_HPP_INCLUDED
  4
  5// Copyright Aleksey Gurtovoy 2002-2004
  6//
  7// Distributed under the Boost Software License, Version 1.0. 
  8// (See accompanying file LICENSE_1_0.txt or copy at 
  9// http://www.boost.org/LICENSE_1_0.txt)
 10//
 11// See http://www.boost.org/libs/mpl for documentation.
 12
 13// $Id: is_sequence.hpp 49267 2008-10-11 06:19:02Z agurtovoy $
 14// $Date: 2008-10-11 02:19:02 -0400 (Sat, 11 Oct 2008) $
 15// $Revision: 49267 $
 16
 17#include <boost/mpl/not.hpp>
 18#include <boost/mpl/and.hpp>
 19#include <boost/mpl/begin_end.hpp>
 20#include <boost/mpl/if.hpp>
 21#include <boost/mpl/bool.hpp>
 22#include <boost/mpl/sequence_tag_fwd.hpp>
 23#include <boost/mpl/identity.hpp>
 24#include <boost/mpl/void.hpp>
 25#include <boost/mpl/aux_/has_tag.hpp>
 26#include <boost/mpl/aux_/has_begin.hpp>
 27#include <boost/mpl/aux_/na_spec.hpp>
 28#include <boost/mpl/aux_/lambda_support.hpp>
 29#include <boost/mpl/aux_/config/eti.hpp>
 30#include <boost/mpl/aux_/config/msvc.hpp>
 31#include <boost/mpl/aux_/config/workaround.hpp>
 32#if BOOST_WORKAROUND(BOOST_MSVC, < 1300)
 33#   include <boost/mpl/aux_/msvc_is_class.hpp>
 34#elif BOOST_WORKAROUND(BOOST_MSVC, == 1300)
 35#   include <boost/type_traits/is_class.hpp>
 36#endif
 37
 38#include <boost/type_traits/is_same.hpp>
 39
 40namespace boost { namespace mpl {
 41
 42#if BOOST_WORKAROUND(BOOST_MSVC, <= 1300)
 43
 44namespace aux {
 45
 46// agurt, 11/jun/03: 
 47// MSVC 6.5/7.0 fails if 'has_begin' is instantiated on a class type that has a
 48// 'begin' member that doesn't name a type; e.g. 'has_begin< std::vector<int> >'
 49// would fail; requiring 'T' to have _both_ 'tag' and 'begin' members workarounds
 50// the issue for most real-world cases
 51template< typename T > struct is_sequence_impl
 52    : and_<
 53          identity< aux::has_tag<T> >
 54        , identity< aux::has_begin<T> >
 55        >
 56{
 57};
 58
 59} // namespace aux
 60        
 61template<
 62      typename BOOST_MPL_AUX_NA_PARAM(T)
 63    >
 64struct is_sequence
 65    : if_<
 66#if BOOST_WORKAROUND(BOOST_MSVC, < 1300)
 67          aux::msvc_is_class<T> 
 68#else
 69          boost::is_class<T> 
 70#endif
 71        , aux::is_sequence_impl<T>
 72        , bool_<false>
 73        >::type
 74{
 75    BOOST_MPL_AUX_LAMBDA_SUPPORT(1, is_sequence, (T))
 76};
 77
 78#elif defined(BOOST_MPL_CFG_NO_HAS_XXX)
 79
 80template<
 81      typename BOOST_MPL_AUX_NA_PARAM(T)
 82    >
 83struct is_sequence
 84    : bool_<false>
 85{
 86};
 87
 88#else
 89
 90template<
 91      typename BOOST_MPL_AUX_NA_PARAM(T)
 92    >
 93struct is_sequence
 94    : not_< is_same< typename begin<T>::type, void_ > >
 95{
 96    BOOST_MPL_AUX_LAMBDA_SUPPORT(1, is_sequence, (T))
 97};
 98
 99#endif // BOOST_MSVC
100
101#if defined(BOOST_MPL_CFG_MSVC_60_ETI_BUG)
102template<> struct is_sequence<int>
103    : bool_<false>
104{
105};
106#endif
107
108BOOST_MPL_AUX_NA_SPEC_NO_ETI(1, is_sequence)
109
110}}
111
112#endif // BOOST_MPL_IS_SEQUENCE_HPP_INCLUDED