stc/exp/ml_stc_linux_make_v1.0/include/boost/mpl/aux_/push_front_impl.hpp

   1 \r
   2 #ifndef BOOST_MPL_AUX_PUSH_FRONT_IMPL_HPP_INCLUDED\r
   3 #define BOOST_MPL_AUX_PUSH_FRONT_IMPL_HPP_INCLUDED\r
   4 \r
   5 // Copyright Aleksey Gurtovoy 2000-2008\r
   6 //\r
   7 // Distributed under the Boost Software License, Version 1.0. \r
   8 // (See accompanying file LICENSE_1_0.txt or copy at \r
   9 // http://www.boost.org/LICENSE_1_0.txt)\r
  10 //\r
  11 // See http://www.boost.org/libs/mpl for documentation.\r
  12 \r
  13 // $Id: push_front_impl.hpp 55679 2009-08-20 07:50:16Z agurtovoy $\r
  14 // $Date: 2009-08-20 03:50:16 -0400 (Thu, 20 Aug 2009) $\r
  15 // $Revision: 55679 $\r
  16 \r
  17 #include <boost/mpl/push_front_fwd.hpp>\r
  18 #include <boost/mpl/assert.hpp>\r
  19 #include <boost/mpl/aux_/has_type.hpp>\r
  20 #include <boost/mpl/aux_/traits_lambda_spec.hpp>\r
  21 #include <boost/mpl/aux_/config/forwarding.hpp>\r
  22 #include <boost/mpl/aux_/config/static_constant.hpp>\r
  23 \r
  24 #include <boost/type_traits/is_same.hpp>\r
  25 \r
  26 namespace boost { namespace mpl {\r
  27 \r
  28 struct has_push_front_arg {};\r
  29 \r
  30 // agurt 05/feb/04: no default implementation; the stub definition is needed \r
  31 // to enable the default 'has_push_front' implementation below\r
  32 \r
  33 template< typename Tag >\r
  34 struct push_front_impl\r
  35 {\r
  36     template< typename Sequence, typename T > struct apply\r
  37     {\r
  38         // should be instantiated only in the context of 'has_push_front_impl';\r
  39         // if you've got an assert here, you are requesting a 'push_front' \r
  40         // specialization that doesn't exist.\r
  41         BOOST_MPL_ASSERT_MSG(\r
  42               ( boost::is_same< T, has_push_front_arg >::value )\r
  43             , REQUESTED_PUSH_FRONT_SPECIALIZATION_FOR_SEQUENCE_DOES_NOT_EXIST\r
  44             , ( Sequence )\r
  45             );\r
  46     };\r
  47 };\r
  48 \r
  49 template< typename Tag >\r
  50 struct has_push_front_impl\r
  51 {\r
  52     template< typename Seq > struct apply\r
  53 #if !defined(BOOST_MPL_CFG_NO_NESTED_FORWARDING)\r
  54         : aux::has_type< push_front< Seq, has_push_front_arg > >\r
  55     {\r
  56 #else\r
  57     {\r
  58         typedef aux::has_type< push_front< Seq, has_push_front_arg > > type;\r
  59         BOOST_STATIC_CONSTANT(bool, value = \r
  60               (aux::has_type< push_front< Seq, has_push_front_arg > >::value)\r
  61             );\r
  62 #endif\r
  63     };\r
  64 };\r
  65 \r
  66 BOOST_MPL_ALGORITM_TRAITS_LAMBDA_SPEC(2, push_front_impl)\r
  67 BOOST_MPL_ALGORITM_TRAITS_LAMBDA_SPEC(1, has_push_front_impl)\r
  68 \r
  69 }}\r
  70 \r
  71 #endif // BOOST_MPL_AUX_PUSH_FRONT_IMPL_HPP_INCLUDED\r