1 | // noncopyable.cpp |
2 | /// |
3 | // (C) Copyright Eric Niebler 2004. |
4 | // Use, modification and distribution are subject to the |
5 | // Boost Software License, Version 1.0. (See accompanying file |
6 | // LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt) |
7 | |
8 | /* |
9 | Revision history: |
10 | 21 December 2005 : Initial version. |
11 | */ |
12 | |
13 | #include <vector> |
14 | #include <boost/foreach.hpp> |
15 | #include <boost/noncopyable.hpp> |
16 | #include <boost/range/iterator_range.hpp> |
17 | |
18 | struct noncopy_vector |
19 | : std::vector<int> |
20 | , private boost::noncopyable |
21 | { |
22 | noncopy_vector() { } |
23 | }; |
24 | |
25 | struct noncopy_range |
26 | : boost::iterator_range<noncopy_vector::iterator> |
27 | , private boost::noncopyable |
28 | { |
29 | noncopy_range() { } |
30 | }; |
31 | |
32 | // Tell FOREACH that noncopy_vector and noncopy_range are non-copyable. |
33 | // NOTE: this is only necessary if |
34 | // a) your type does not inherit from boost::noncopyable, OR |
35 | // b) Boost.Config defines BOOST_BROKEN_IS_BASE_AND_DERIVED for your compiler |
36 | #ifdef BOOST_BROKEN_IS_BASE_AND_DERIVED |
37 | inline boost::mpl::true_ *boost_foreach_is_noncopyable(noncopy_vector *&, boost::foreach::tag) |
38 | { |
39 | return 0; |
40 | } |
41 | |
42 | inline boost::mpl::true_ *boost_foreach_is_noncopyable(noncopy_range *&, boost::foreach::tag) |
43 | { |
44 | return 0; |
45 | } |
46 | #endif |
47 | |
48 | // tell FOREACH that noncopy_range is a lightweight proxy object |
49 | inline boost::mpl::true_ *boost_foreach_is_lightweight_proxy(noncopy_range *&, boost::foreach::tag) |
50 | { |
51 | return 0; |
52 | } |
53 | |
54 | /////////////////////////////////////////////////////////////////////////////// |
55 | // main |
56 | // |
57 | int main( int, char*[] ) |
58 | { |
59 | noncopy_vector v1; |
60 | BOOST_FOREACH( int & i, v1 ) { (void)i; } |
61 | |
62 | noncopy_vector const v2; |
63 | BOOST_FOREACH( int const & j, v2 ) { (void)j; } |
64 | |
65 | noncopy_range rng1; |
66 | BOOST_FOREACH( int & k, rng1 ) { (void)k; } |
67 | |
68 | noncopy_range const rng2; |
69 | BOOST_FOREACH( int & l, rng2 ) { (void)l; } |
70 | |
71 | return 0; |
72 | } |
73 | |