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1 | // |
2 | // visit_each_test.cpp | |
3 | // | |
4 | // Copyright 2014 Peter Dimov | |
5 | // | |
6 | // Distributed under the Boost Software License, Version 1.0. | |
7 | // See accompanying file LICENSE_1_0.txt or copy at | |
8 | // http://www.boost.org/LICENSE_1_0.txt | |
9 | // | |
10 | ||
11 | #include <boost/visit_each.hpp> | |
12 | #include <boost/core/lightweight_test.hpp> | |
13 | #include <string> | |
14 | ||
15 | struct X | |
16 | { | |
17 | int v; | |
18 | std::string w; | |
19 | }; | |
20 | ||
21 | template<class Visitor> inline void visit_each( Visitor & visitor, X const & x ) | |
22 | { | |
23 | using boost::visit_each; | |
24 | ||
25 | visit_each( visitor, x.v ); | |
26 | visit_each( visitor, x.w ); | |
27 | } | |
28 | ||
29 | struct V | |
30 | { | |
31 | int s_; | |
32 | ||
33 | V(): s_( 0 ) | |
34 | { | |
35 | } | |
36 | ||
1e59de90 | 37 | template< class T > void operator()( T const & /*t*/ ) |
7c673cae FG |
38 | { |
39 | } | |
40 | ||
41 | void operator()( int const & v ) | |
42 | { | |
43 | s_ = s_ * 10 + v; | |
44 | } | |
45 | ||
46 | void operator()( std::string const & w ) | |
47 | { | |
1e59de90 | 48 | s_ = s_ * 10 + static_cast<int>( w.size() ); |
7c673cae FG |
49 | } |
50 | }; | |
51 | ||
52 | int main() | |
53 | { | |
54 | X x = { 5, "test" }; | |
55 | V v; | |
56 | ||
57 | { | |
58 | using boost::visit_each; | |
59 | visit_each( v, x ); | |
60 | } | |
61 | ||
62 | BOOST_TEST( v.s_ == 54 ); | |
63 | ||
64 | return boost::report_errors(); | |
65 | } |