2 #ifndef BOOST_MPL_AUX_PUSH_BACK_IMPL_HPP_INCLUDED
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3 #define BOOST_MPL_AUX_PUSH_BACK_IMPL_HPP_INCLUDED
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5 // Copyright Aleksey Gurtovoy 2000-2008
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7 // Distributed under the Boost Software License, Version 1.0.
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8 // (See accompanying file LICENSE_1_0.txt or copy at
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9 // http://www.boost.org/LICENSE_1_0.txt)
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11 // See http://www.boost.org/libs/mpl for documentation.
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13 // $Id: push_back_impl.hpp 55679 2009-08-20 07:50:16Z agurtovoy $
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14 // $Date: 2009-08-20 03:50:16 -0400 (Thu, 20 Aug 2009) $
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15 // $Revision: 55679 $
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17 #include <boost/mpl/push_back_fwd.hpp>
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18 #include <boost/mpl/assert.hpp>
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19 #include <boost/mpl/aux_/has_type.hpp>
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20 #include <boost/mpl/aux_/traits_lambda_spec.hpp>
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21 #include <boost/mpl/aux_/config/forwarding.hpp>
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22 #include <boost/mpl/aux_/config/static_constant.hpp>
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24 #include <boost/type_traits/is_same.hpp>
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26 namespace boost { namespace mpl {
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28 struct has_push_back_arg {};
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30 // agurt 05/feb/04: no default implementation; the stub definition is needed
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31 // to enable the default 'has_push_back' implementation below
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32 template< typename Tag >
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33 struct push_back_impl
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35 template< typename Sequence, typename T > struct apply
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37 // should be instantiated only in the context of 'has_push_back_impl';
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38 // if you've got an assert here, you are requesting a 'push_back'
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39 // specialization that doesn't exist.
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40 BOOST_MPL_ASSERT_MSG(
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41 ( boost::is_same< T, has_push_back_arg >::value )
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42 , REQUESTED_PUSH_BACK_SPECIALIZATION_FOR_SEQUENCE_DOES_NOT_EXIST
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48 template< typename Tag >
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49 struct has_push_back_impl
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51 template< typename Seq > struct apply
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52 #if !defined(BOOST_MPL_CFG_NO_NESTED_FORWARDING)
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53 : aux::has_type< push_back< Seq, has_push_back_arg > >
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57 typedef aux::has_type< push_back< Seq, has_push_back_arg > > type;
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58 BOOST_STATIC_CONSTANT(bool, value =
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59 (aux::has_type< push_back< Seq, has_push_back_arg > >::value)
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65 BOOST_MPL_ALGORITM_TRAITS_LAMBDA_SPEC(2, push_back_impl)
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66 BOOST_MPL_ALGORITM_TRAITS_LAMBDA_SPEC(1, has_push_back_impl)
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70 #endif // BOOST_MPL_AUX_PUSH_BACK_IMPL_HPP_INCLUDED
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