forked from boostorg/mpl
Aleksey Gurtovoy
107 lines
2.8 KiB
C++
107 lines
2.8 KiB
C++
//-----------------------------------------------------------------------------
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// boost mpl/is_sequence.hpp header file
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// See http://www.boost.org for updates, documentation, and revision history.
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//-----------------------------------------------------------------------------
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//
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// Copyright (c) 2002
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// Aleksey Gurtovoy
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//
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// Permission to use, copy, modify, distribute and sell this software
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// and its documentation for any purpose is hereby granted without fee,
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// provided that the above copyright notice appears in all copies and
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// that both the copyright notice and this permission notice appear in
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// supporting documentation. No representations are made about the
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// suitability of this software for any purpose. It is provided "as is"
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// without express or implied warranty.
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#ifndef BOOST_MPL_IS_SEQUENCE_HPP_INCLUDED
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#define BOOST_MPL_IS_SEQUENCE_HPP_INCLUDED
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#include "boost/mpl/not.hpp"
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#include "boost/mpl/and.hpp"
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#include "boost/mpl/begin_end.hpp"
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#include "boost/mpl/if.hpp"
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#include "boost/mpl/bool.hpp"
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#include "boost/mpl/sequence_tag_fwd.hpp"
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#include "boost/mpl/identity.hpp"
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#include "boost/mpl/void.hpp"
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#include "boost/mpl/aux_/has_tag.hpp"
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#include "boost/mpl/aux_/has_begin.hpp"
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#include "boost/mpl/aux_/void_spec.hpp"
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#include "boost/mpl/aux_/lambda_support.hpp"
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#include "boost/mpl/aux_/config/eti.hpp"
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#include "boost/mpl/aux_/config/workaround.hpp"
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#include "boost/type_traits/is_same.hpp"
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#include "boost/type_traits/is_class.hpp"
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namespace boost { namespace mpl {
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#if BOOST_WORKAROUND(BOOST_MSVC, <= 1300)
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namespace aux {
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// agurt, 11/jun/03:
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// MSVC 6.5/7.0 fails if 'has_begin' is instantiated on a class type that has a
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// 'begin' member that doesn't name a type; e.g. 'has_begin< std::vector<int> >'
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// would fail; requiring 'T' to have _both_ 'tag' and 'begin' members workarounds
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// the issue for most real-world cases
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template< typename T > struct is_sequence_impl
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: and_<
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identity< aux::has_tag<T> >
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, identity< aux::has_begin<T> >
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>
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{
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};
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} // namespace aux
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template<
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typename BOOST_MPL_AUX_VOID_SPEC_PARAM(T)
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>
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struct is_sequence
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: if_<
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boost::is_class<T>
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, aux::is_sequence_impl<T>
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, bool_<false>
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>::type
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{
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BOOST_MPL_AUX_LAMBDA_SUPPORT(1,is_sequence,(T))
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};
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#elif defined(BOOST_MPL_NO_AUX_HAS_XXX)
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template<
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typename BOOST_MPL_AUX_VOID_SPEC_PARAM(T)
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>
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struct is_sequence
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: bool_<false>
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{
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};
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#else
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template<
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typename BOOST_MPL_AUX_VOID_SPEC_PARAM(T)
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>
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struct is_sequence
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: not_< is_same< typename begin<T>::type, void_ > >
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{
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BOOST_MPL_AUX_LAMBDA_SUPPORT(1,is_sequence,(T))
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};
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#endif // BOOST_MSVC
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#if defined(BOOST_MPL_MSVC_60_ETI_BUG)
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template<> struct is_sequence<int>
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: bool_<false>
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{
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};
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#endif
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BOOST_MPL_AUX_VOID_SPEC(1, is_sequence)
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}} // namespace boost::mpl
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#endif // BOOST_MPL_IS_SEQUENCE_HPP_INCLUDED
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