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>
operator ()write_string22 std::ostream* operator()(std::ostream* sout, T const& t) const
23 {
24 return &(*sout << t << " ");
25 }
26 };
27
28 template<typename Tree>
29 void
process_tree(Tree const & tree)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
main()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
64