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  1.  
  2. #ifndef BOOST_MPL_EVAL_IF_HPP_INCLUDED
  3. #define BOOST_MPL_EVAL_IF_HPP_INCLUDED
  4.  
  5. // Copyright Aleksey Gurtovoy 2000-2004
  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/if.hpp>
  18. #include <boost/mpl/aux_/na_spec.hpp>
  19. #include <boost/mpl/aux_/lambda_support.hpp>
  20. #include <boost/mpl/aux_/config/msvc.hpp>
  21. #include <boost/mpl/aux_/config/gcc.hpp>
  22. #include <boost/mpl/aux_/config/workaround.hpp>
  23.  
  24. namespace mars_boost {} namespace boost = mars_boost; namespace mars_boost { namespace mpl {
  25.  
  26. template<
  27.       typename BOOST_MPL_AUX_NA_PARAM(C)
  28.     , typename BOOST_MPL_AUX_NA_PARAM(F1)
  29.     , typename BOOST_MPL_AUX_NA_PARAM(F2)
  30.     >
  31. struct eval_if
  32. #if BOOST_WORKAROUND(BOOST_MSVC, <= 1300) \
  33.      || ( BOOST_WORKAROUND(BOOST_MPL_CFG_GCC, >= 0x0300) \
  34.         && BOOST_WORKAROUND(BOOST_MPL_CFG_GCC, BOOST_TESTED_AT(0x0304)) \
  35.         )
  36. {
  37.     typedef typename if_<C,F1,F2>::type f_;
  38.     typedef typename f_::type type;
  39. #else
  40.     : if_<C,F1,F2>::type
  41. {
  42. #endif
  43.     BOOST_MPL_AUX_LAMBDA_SUPPORT(3,eval_if,(C,F1,F2))
  44. };
  45.  
  46. // (almost) copy & paste in order to save one more
  47. // recursively nested template instantiation to user
  48. template<
  49.       bool C
  50.     , typename F1
  51.     , typename F2
  52.     >
  53. struct eval_if_c
  54. #if BOOST_WORKAROUND(BOOST_MSVC, <= 1300) \
  55.      || ( BOOST_WORKAROUND(BOOST_MPL_CFG_GCC, >= 0x0300) \
  56.         && BOOST_WORKAROUND(BOOST_MPL_CFG_GCC, BOOST_TESTED_AT(0x0304)) \
  57.         )
  58. {
  59.     typedef typename if_c<C,F1,F2>::type f_;
  60.     typedef typename f_::type type;
  61. #else
  62.     : if_c<C,F1,F2>::type
  63. {
  64. #endif
  65. };
  66.  
  67. BOOST_MPL_AUX_NA_SPEC(3, eval_if)
  68.  
  69. }}
  70.  
  71. #endif // BOOST_MPL_EVAL_IF_HPP_INCLUDED
  72.  
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