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is_sequence.hpp
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#ifndef BOOST_MPL_IS_SEQUENCE_HPP_INCLUDED #define BOOST_MPL_IS_SEQUENCE_HPP_INCLUDED // Copyright Aleksey Gurtovoy 2002-2004 // // 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) // // See http://www.boost.org/libs/mpl for documentation. // $Id$ // $Date$ // $Revision$ #include <boost/mpl/not.hpp> #include <boost/mpl/and.hpp> #include <boost/mpl/begin_end.hpp> #include <boost/mpl/if.hpp> #include <boost/mpl/bool.hpp> #include <boost/mpl/sequence_tag_fwd.hpp> #include <boost/mpl/identity.hpp> #include <boost/mpl/void.hpp> #include <boost/mpl/aux_/has_tag.hpp> #include <boost/mpl/aux_/has_begin.hpp> #include <boost/mpl/aux_/na_spec.hpp> #include <boost/mpl/aux_/lambda_support.hpp> #include <boost/mpl/aux_/config/eti.hpp> #include <boost/mpl/aux_/config/msvc.hpp> #include <boost/mpl/aux_/config/workaround.hpp> #if BOOST_WORKAROUND(BOOST_MSVC, < 1300) # include <boost/mpl/aux_/msvc_is_class.hpp> #elif BOOST_WORKAROUND(BOOST_MSVC, == 1300) # include <boost/type_traits/is_class.hpp> #endif #include <boost/type_traits/is_same.hpp> namespace boost { namespace mpl { #if BOOST_WORKAROUND(BOOST_MSVC, <= 1300) namespace aux { // agurt, 11/jun/03: // MSVC 6.5/7.0 fails if 'has_begin' is instantiated on a class type that has a // 'begin' member that doesn't name a type; e.g. 'has_begin< std::vector<int> >' // would fail; requiring 'T' to have _both_ 'tag' and 'begin' members workarounds // the issue for most real-world cases template< typename T > struct is_sequence_impl : and_< identity< aux::has_tag<T> > , identity< aux::has_begin<T> > > { }; } // namespace aux template< typename BOOST_MPL_AUX_NA_PARAM(T) > struct is_sequence : if_< #if BOOST_WORKAROUND(BOOST_MSVC, < 1300) aux::msvc_is_class<T> #else boost::is_class<T> #endif , aux::is_sequence_impl<T> , bool_<false> >::type { BOOST_MPL_AUX_LAMBDA_SUPPORT(1, is_sequence, (T)) }; #elif defined(BOOST_MPL_CFG_NO_HAS_XXX) template< typename BOOST_MPL_AUX_NA_PARAM(T) > struct is_sequence : bool_<false> { }; #else template< typename BOOST_MPL_AUX_NA_PARAM(T) > struct is_sequence : not_< is_same< typename begin<T>::type, void_ > > { BOOST_MPL_AUX_LAMBDA_SUPPORT(1, is_sequence, (T)) }; #endif // BOOST_MSVC #if defined(BOOST_MPL_CFG_MSVC_60_ETI_BUG) template<> struct is_sequence<int> : bool_<false> { }; #endif BOOST_MPL_AUX_NA_SPEC_NO_ETI(1, is_sequence) }} #endif // BOOST_MPL_IS_SEQUENCE_HPP_INCLUDED