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1 | // This header intentionally has no include guards. |
2 | // | |
3 | // Copyright (c) 2010 Neil Groves | |
4 | // Distributed under the Boost Software License, Version 1.0. | |
5 | // See accompanying file LICENSE_1_0.txt or copy at | |
6 | // http://www.boost.org/LICENSE_1_0.txt | |
7 | // | |
8 | // This code utilises the experience gained during the evolution of | |
9 | // <boost/smart_ptr/operator_bool.hpp> | |
10 | #ifndef BOOST_RANGE_SAFE_BOOL_INCLUDED_HPP | |
11 | #define BOOST_RANGE_SAFE_BOOL_INCLUDED_HPP | |
12 | ||
13 | #include <boost/config.hpp> | |
14 | #include <boost/range/config.hpp> | |
15 | ||
16 | namespace boost | |
17 | { | |
18 | namespace range_detail | |
19 | { | |
20 | ||
21 | template<class DataMemberPtr> | |
22 | class safe_bool | |
23 | { | |
24 | public: | |
25 | typedef safe_bool this_type; | |
26 | ||
27 | #if (defined(__SUNPRO_CC) && BOOST_WORKAROUND(__SUNPRO_CC, < 0x570)) || defined(__CINT_) | |
28 | typedef bool unspecified_bool_type; | |
29 | static unspecified_bool_type to_unspecified_bool(const bool x, DataMemberPtr) | |
30 | { | |
31 | return x; | |
32 | } | |
33 | #elif defined(_MANAGED) | |
34 | static void unspecified_bool(this_type***) | |
35 | { | |
36 | } | |
37 | typedef void(*unspecified_bool_type)(this_type***); | |
38 | static unspecified_bool_type to_unspecified_bool(const bool x, DataMemberPtr) | |
39 | { | |
40 | return x ? unspecified_bool : 0; | |
41 | } | |
42 | #elif \ | |
43 | ( defined(__MWERKS__) && BOOST_WORKAROUND(__MWERKS__, < 0x3200) ) || \ | |
44 | ( defined(__GNUC__) && (__GNUC__ * 100 + __GNUC_MINOR__ < 304) ) || \ | |
45 | ( defined(__SUNPRO_CC) && BOOST_WORKAROUND(__SUNPRO_CC, <= 0x590) ) | |
46 | ||
47 | typedef bool (this_type::*unspecified_bool_type)() const; | |
48 | ||
49 | static unspecified_bool_type to_unspecified_bool(const bool x, DataMemberPtr) | |
50 | { | |
51 | return x ? &this_type::detail_safe_bool_member_fn : 0; | |
52 | } | |
53 | private: | |
54 | bool detail_safe_bool_member_fn() const { return false; } | |
55 | #else | |
56 | typedef DataMemberPtr unspecified_bool_type; | |
57 | static unspecified_bool_type to_unspecified_bool(const bool x, DataMemberPtr p) | |
58 | { | |
59 | return x ? p : 0; | |
60 | } | |
61 | #endif | |
62 | private: | |
63 | safe_bool(); | |
64 | safe_bool(const safe_bool&); | |
65 | void operator=(const safe_bool&); | |
66 | ~safe_bool(); | |
67 | }; | |
68 | ||
69 | } // namespace range_detail | |
70 | } // namespace boost | |
71 | ||
72 | #endif // include guard |