boost_core 0.1.0

Boost C++ library boost_core packaged using Zanbil
Documentation 
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65

//
// visit_each_test.cpp
//
// Copyright 2014 Peter Dimov
//
// 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
//

#include <boost/visit_each.hpp>
#include <boost/core/lightweight_test.hpp>
#include <string>

struct X
{
    int v;
    std::string w;
};

template<class Visitor> inline void visit_each( Visitor & visitor, X const & x )
{
    using boost::visit_each;

    visit_each( visitor, x.v );
    visit_each( visitor, x.w );
}

struct V
{
    int s_;

    V(): s_( 0 )
    {
    }

    template< class T > void operator()( T const & /*t*/ )
    {
    }

    void operator()( int const & v )
    {
        s_ = s_ * 10 + v;
    }

    void operator()( std::string const & w )
    {
        s_ = s_ * 10 + static_cast<int>( w.size() );
    }
};

int main()
{
    X x = { 5, "test" };
    V v;

    {
        using boost::visit_each;
        visit_each( v, x );
    }

    BOOST_TEST( v.s_ == 54 );

    return boost::report_errors();
}