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
|
// Copyright Aleksey Gurtovoy 2002-2004
//
// 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)
//
// See http://www.boost.org/libs/mpl for documentation.
// $Id: inherit_multiply.cpp 49268 2008-10-11 06:26:17Z agurtovoy $
// $Date: 2008-10-11 02:26:17 -0400 (Sat, 11 Oct 2008) $
// $Revision: 49268 $
#include <boost/mpl/inherit.hpp>
#include <boost/mpl/inherit_linearly.hpp>
#include <boost/mpl/list.hpp>
#include <iostream>
namespace mpl = boost::mpl;
using namespace mpl::placeholders;
template< typename T >
struct tuple_field
{
typedef tuple_field type; // note the typedef
T field_;
};
template< typename T >
inline
T& field(tuple_field<T>& t)
{
return t.field_;
}
typedef mpl::inherit_linearly<
mpl::list<int,char const*,bool>
, mpl::inherit< _1, tuple_field<_2> >
>::type my_tuple;
int main()
{
my_tuple t;
field<int>(t) = -1;
field<char const*>(t) = "text";
field<bool>(t) = false;
std::cout
<< field<int>(t) << '\n'
<< field<char const*>(t) << '\n'
<< field<bool>(t) << '\n'
;
return 0;
}
|
