ceph/src/boost/libs/fusion/test/algorithm/count_if.cpp

   1 /*=============================================================================
   2     Copyright (c) 2001-2011 Joel de Guzman
   3     Copyright (c) 2005 Eric Niebler
   4
   5     Distributed under the Boost Software License, Version 1.0. (See accompanying
   6     file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
   7 ==============================================================================*/
   8 #include <boost/detail/lightweight_test.hpp>
   9 #include <boost/fusion/container/vector/vector.hpp>
  10 #include <boost/fusion/adapted/mpl.hpp>
  11 #include <boost/fusion/algorithm/query/count_if.hpp>
  12 #include <boost/mpl/vector_c.hpp>
  13 #include <functional>
  14
  15 template <typename F> struct bind1st;
  16 template <template <typename> class F, typename T>
  17 struct bind1st<F<T> > : public F<T>
  18 {
  19     T n;
  20     bind1st(T n) : n(n) { }
  21     bool operator()(T v) const { return F<T>::operator()(n, v); }
  22 };
  23
  24 int
  25 main()
  26 {
  27     {
  28         boost::fusion::vector<int, short, double> t(1, 2, 3.3);
  29         BOOST_TEST(boost::fusion::count_if(t, bind1st<std::equal_to<double> >(2)) == 1);
  30     }
  31
  32     {
  33         boost::fusion::vector<int, short, double> t(1, 2, 3.3);
  34         BOOST_TEST(boost::fusion::count_if(t, bind1st<std::equal_to<double> >(3)) == 0);
  35     }
  36
  37     {
  38         typedef boost::mpl::vector_c<int, 1, 2, 3> mpl_vec;
  39         // Cannot use lambda here as mpl iterators return rvalues and lambda needs lvalues
  40         BOOST_TEST(boost::fusion::count_if(mpl_vec(), bind1st<std::greater_equal<int> >(2)) == 2);
  41         BOOST_TEST(boost::fusion::count_if(mpl_vec(), bind1st<std::less<int> >(2)) == 1);
  42     }
  43
  44     return boost::report_errors();
  45 }
  46