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/Src/Dependencies/Boost/boost/range/detail/safe_bool.hpp

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C++ Header | 72 lines | 55 code | 8 blank | 9 comment | 7 complexity | 2c7240a689c65465a423ade51a7b1675 MD5 | raw file
 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
16namespace boost
17{
18    namespace range_detail
19    {
20
21template<class DataMemberPtr>
22class safe_bool
23{
24public:
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    }
53private:
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
62private:
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