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3rdparty/boost_1_81_0/libs/mpl/test/fold.cpp 1.4 KB
73ef4ff3   Hu Chunming   提交三方库
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  // Copyright Aleksey Gurtovoy 2000-2004
  //
  // Distributed under the Boost Software License, Version 1.0.
  // (See accompanying file LICENSE_1_0.txt or copy at 
  // http://www.boost.org/LICENSE_1_0.txt)
  //
  // See http://www.boost.org/libs/mpl for documentation.
  
  // $Id$
  // $Date$
  // $Revision$
  
  #include <boost/mpl/fold.hpp>
  #include <boost/mpl/reverse_fold.hpp>
  //#include <boost/mpl/vector.hpp>
  #include <boost/mpl/list.hpp>
  #include <boost/mpl/list_c.hpp>
  #include <boost/mpl/equal.hpp>
  #include <boost/mpl/equal_to.hpp>
  #include <boost/mpl/next.hpp>
  #include <boost/mpl/push_front.hpp>
  #include <boost/mpl/if.hpp>
  #include <boost/mpl/less.hpp>
  #include <boost/mpl/int.hpp>
  #include <boost/mpl/at.hpp>
  #include <boost/mpl/size.hpp>
  #include <boost/type_traits/is_float.hpp>
  
  #include <boost/mpl/aux_/test.hpp>
  
  MPL_TEST_CASE()
  {
      typedef list<long,float,short,double,float,long,long double> types;
      typedef fold<
            types
          , int_<0>
          , if_< boost::is_float<_2>,next<_1>,_1 >
          >::type number_of_floats;
  
      MPL_ASSERT_RELATION( number_of_floats::value, ==, 4 );
  }
  
  MPL_TEST_CASE()
  {
      typedef list_c<int,5,-1,0,-7,-2,0,-5,4> numbers;
      typedef list_c<int,-1,-7,-2,-5> negatives;
      typedef reverse_fold<
            numbers
          , list_c<int>
          , if_< less< _2,int_<0> >, push_front<_1,_2>, _1 >
          >::type result;
  
      MPL_ASSERT(( equal< result,negatives,equal_to<_1,_2> > ));
  }