| 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 |
|---|
| 73 | |
|---|
