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

   1 /*=============================================================================
   2     Copyright (c) 2001-2011 Joel de Guzman
   3     Copyright (c) 2011 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 <string>
   9 #include <sstream>
  10 #include <iostream>
  11 #include <boost/detail/lightweight_test.hpp>
  12 #include <boost/fusion/container/vector/vector.hpp>
  13 #include <boost/fusion/algorithm/iteration/fold.hpp>
  14 #include <boost/fusion/container/generation/make_vector.hpp>
  15 #include "../sequence/tree.hpp"
  16
  17 struct write_string
  18 {
  19     typedef std::ostream* result_type;
  20
  21     template<typename T>
  22     std::ostream* operator()(std::ostream* sout, T const& t) const
  23     {
  24         return &(*sout << t << " ");
  25     }
  26 };
  27
  28 template<typename Tree>
  29 void
  30 process_tree(Tree const &tree)
  31 {
  32     using namespace boost;
  33
  34     std::stringstream str;
  35     fusion::fold(tree, &str, write_string());
  36     std::string res = str.str();
  37
  38     BOOST_TEST_EQ(res, "a b c 1 2 3 100 e f 0 B 1 h i 4 5 6 j k l ");
  39 }
  40
  41 int
  42 main()
  43 {
  44     using namespace boost::fusion;
  45     process_tree(
  46         make_tree(
  47             make_vector(double(0),'B')
  48             , make_tree(
  49                 make_vector(1,2,long(3))
  50                 , make_tree(make_vector('a','b','c'))
  51                 , make_tree(make_vector(short('d'),'e','f'))
  52             )
  53             , make_tree(
  54                 make_vector(4,5,6)
  55                 , make_tree(make_vector(float(1),'h','i'))
  56                 , make_tree(make_vector('j','k','l'))
  57             )
  58         )
  59     );
  60
  61     return boost::report_errors();
  62 }
  63