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71 lines
2.2 KiB
71 lines
2.2 KiB
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#ifndef BOOST_MPL_AUX_PUSH_FRONT_IMPL_HPP_INCLUDED |
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#define BOOST_MPL_AUX_PUSH_FRONT_IMPL_HPP_INCLUDED |
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// Copyright Aleksey Gurtovoy 2000-2008 |
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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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// |
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// See http://www.boost.org/libs/mpl for documentation. |
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// $Id: push_front_impl.hpp 55679 2009-08-20 07:50:16Z agurtovoy $ |
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// $Date: 2009-08-20 03:50:16 -0400 (Thu, 20 Aug 2009) $ |
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// $Revision: 55679 $ |
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#include <boost/mpl/push_front_fwd.hpp> |
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#include <boost/mpl/assert.hpp> |
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#include <boost/mpl/aux_/has_type.hpp> |
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#include <boost/mpl/aux_/traits_lambda_spec.hpp> |
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#include <boost/mpl/aux_/config/forwarding.hpp> |
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#include <boost/mpl/aux_/config/static_constant.hpp> |
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#include <boost/type_traits/is_same.hpp> |
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namespace boost { namespace mpl { |
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struct has_push_front_arg {}; |
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// agurt 05/feb/04: no default implementation; the stub definition is needed |
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// to enable the default 'has_push_front' implementation below |
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template< typename Tag > |
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struct push_front_impl |
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{ |
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template< typename Sequence, typename T > struct apply |
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{ |
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// should be instantiated only in the context of 'has_push_front_impl'; |
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// if you've got an assert here, you are requesting a 'push_front' |
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// specialization that doesn't exist. |
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BOOST_MPL_ASSERT_MSG( |
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( boost::is_same< T, has_push_front_arg >::value ) |
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, REQUESTED_PUSH_FRONT_SPECIALIZATION_FOR_SEQUENCE_DOES_NOT_EXIST |
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, ( Sequence ) |
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); |
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}; |
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}; |
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template< typename Tag > |
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struct has_push_front_impl |
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{ |
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template< typename Seq > struct apply |
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#if !defined(BOOST_MPL_CFG_NO_NESTED_FORWARDING) |
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: aux::has_type< push_front< Seq, has_push_front_arg > > |
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{ |
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#else |
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{ |
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typedef aux::has_type< push_front< Seq, has_push_front_arg > > type; |
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BOOST_STATIC_CONSTANT(bool, value = |
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(aux::has_type< push_front< Seq, has_push_front_arg > >::value) |
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); |
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#endif |
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}; |
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}; |
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BOOST_MPL_ALGORITM_TRAITS_LAMBDA_SPEC(2, push_front_impl) |
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BOOST_MPL_ALGORITM_TRAITS_LAMBDA_SPEC(1, has_push_front_impl) |
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}} |
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#endif // BOOST_MPL_AUX_PUSH_FRONT_IMPL_HPP_INCLUDED
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