1 ///////////////////////////////////////////////////////////////////////////////
2 // foreach.hpp header file
3 //
4 // Copyright 2010 Eric Niebler.
5 // Distributed under the Boost Software License, Version 1.0. (See
6 // accompanying file LICENSE_1_0.txt or copy at
7 // http://www.boost.org/LICENSE_1_0.txt)
8 // See http://www.boost.org/libs/foreach for documentation
9 //
10 // Credits:
11 // Kazutoshi Satoda: for suggesting the need for a _fwd header for foreach's
12 //                      customization points.
13 
14 #ifndef BOOST_FOREACH_FWD_HPP
15 #define BOOST_FOREACH_FWD_HPP
16 
17 // This must be at global scope, hence the uglified name
18 enum boost_foreach_argument_dependent_lookup_hack
19 {
20     boost_foreach_argument_dependent_lookup_hack_value
21 };
22 
23 namespace boost
24 {
25 
26 namespace foreach
27 {
28     ///////////////////////////////////////////////////////////////////////////////
29     // boost::foreach::tag
30     //
31     typedef boost_foreach_argument_dependent_lookup_hack tag;
32 
33     ///////////////////////////////////////////////////////////////////////////////
34     // boost::foreach::is_lightweight_proxy
35     //   Specialize this for user-defined collection types if they are inexpensive to copy.
36     //   This tells BOOST_FOREACH it can avoid the rvalue/lvalue detection stuff.
37     template<typename T>
38     struct is_lightweight_proxy;
39 
40     ///////////////////////////////////////////////////////////////////////////////
41     // boost::foreach::is_noncopyable
42     //   Specialize this for user-defined collection types if they cannot be copied.
43     //   This also tells BOOST_FOREACH to avoid the rvalue/lvalue detection stuff.
44     template<typename T>
45     struct is_noncopyable;
46 
47 } // namespace foreach
48 
49 } // namespace boost
50 
51 #endif
52