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  1.  
  2. #ifndef BOOST_MPL_AUX_PUSH_FRONT_IMPL_HPP_INCLUDED
  3. #define BOOST_MPL_AUX_PUSH_FRONT_IMPL_HPP_INCLUDED
  4.  
  5. // Copyright Aleksey Gurtovoy 2000-2008
  6. //
  7. // Distributed under the Boost Software License, Version 1.0.
  8. // (See accompanying file LICENSE_1_0.txt or copy at
  9. // http://www.boost.org/LICENSE_1_0.txt)
  10. //
  11. // See http://www.boost.org/libs/mpl for documentation.
  12.  
  13. // $Id$
  14. // $Date$
  15. // $Revision$
  16.  
  17. #include <boost/mpl/push_front_fwd.hpp>
  18. #include <boost/mpl/assert.hpp>
  19. #include <boost/mpl/aux_/has_type.hpp>
  20. #include <boost/mpl/aux_/traits_lambda_spec.hpp>
  21. #include <boost/mpl/aux_/config/forwarding.hpp>
  22. #include <boost/mpl/aux_/config/static_constant.hpp>
  23.  
  24. #include <boost/type_traits/is_same.hpp>
  25.  
  26. namespace mars_boost {} namespace boost = mars_boost; namespace mars_boost { namespace mpl {
  27.  
  28. struct has_push_front_arg {};
  29.  
  30. // agurt 05/feb/04: no default implementation; the stub definition is needed
  31. // to enable the default 'has_push_front' implementation below
  32.  
  33. template< typename Tag >
  34. struct push_front_impl
  35. {
  36.     template< typename Sequence, typename T > struct apply
  37.     {
  38.         // should be instantiated only in the context of 'has_push_front_impl';
  39.         // if you've got an assert here, you are requesting a 'push_front'
  40.         // specialization that doesn't exist.
  41.         BOOST_MPL_ASSERT_MSG(
  42.               ( mars_boost::is_same< T, has_push_front_arg >::value )
  43.             , REQUESTED_PUSH_FRONT_SPECIALIZATION_FOR_SEQUENCE_DOES_NOT_EXIST
  44.             , ( Sequence )
  45.             );
  46.     };
  47. };
  48.  
  49. template< typename Tag >
  50. struct has_push_front_impl
  51. {
  52.     template< typename Seq > struct apply
  53. #if !defined(BOOST_MPL_CFG_NO_NESTED_FORWARDING)
  54.         : aux::has_type< push_front< Seq, has_push_front_arg > >
  55.     {
  56. #else
  57.     {
  58.         typedef aux::has_type< push_front< Seq, has_push_front_arg > > type;
  59.         BOOST_STATIC_CONSTANT(bool, value =
  60.               (aux::has_type< push_front< Seq, has_push_front_arg > >::value)
  61.             );
  62. #endif
  63.     };
  64. };
  65.  
  66. BOOST_MPL_ALGORITM_TRAITS_LAMBDA_SPEC(2, push_front_impl)
  67. BOOST_MPL_ALGORITM_TRAITS_LAMBDA_SPEC(1, has_push_front_impl)
  68.  
  69. }}
  70.  
  71. #endif // BOOST_MPL_AUX_PUSH_FRONT_IMPL_HPP_INCLUDED
  72.  
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