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  1.  
  2. #ifndef BOOST_MPL_AUX_PUSH_BACK_IMPL_HPP_INCLUDED
  3. #define BOOST_MPL_AUX_PUSH_BACK_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_back_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_back_arg {};
  29.  
  30. // agurt 05/feb/04: no default implementation; the stub definition is needed
  31. // to enable the default 'has_push_back' implementation below
  32. template< typename Tag >
  33. struct push_back_impl
  34. {
  35.     template< typename Sequence, typename T > struct apply
  36.     {
  37.         // should be instantiated only in the context of 'has_push_back_impl';
  38.         // if you've got an assert here, you are requesting a 'push_back'
  39.         // specialization that doesn't exist.
  40.         BOOST_MPL_ASSERT_MSG(
  41.               ( mars_boost::is_same< T, has_push_back_arg >::value )
  42.             , REQUESTED_PUSH_BACK_SPECIALIZATION_FOR_SEQUENCE_DOES_NOT_EXIST
  43.             , ( Sequence )
  44.             );
  45.     };
  46. };
  47.  
  48. template< typename Tag >
  49. struct has_push_back_impl
  50. {
  51.     template< typename Seq > struct apply
  52. #if !defined(BOOST_MPL_CFG_NO_NESTED_FORWARDING)
  53.         : aux::has_type< push_back< Seq, has_push_back_arg > >
  54.     {
  55. #else
  56.     {
  57.         typedef aux::has_type< push_back< Seq, has_push_back_arg > > type;
  58.         BOOST_STATIC_CONSTANT(bool, value =
  59.               (aux::has_type< push_back< Seq, has_push_back_arg > >::value)
  60.             );
  61. #endif
  62.     };
  63. };
  64.  
  65. BOOST_MPL_ALGORITM_TRAITS_LAMBDA_SPEC(2, push_back_impl)
  66. BOOST_MPL_ALGORITM_TRAITS_LAMBDA_SPEC(1, has_push_back_impl)
  67.  
  68. }}
  69.  
  70. #endif // BOOST_MPL_AUX_PUSH_BACK_IMPL_HPP_INCLUDED
  71.  
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