Chris@16: //  This header intentionally has no include guards.
Chris@16: //
Chris@16: //  Copyright (c) 2010 Neil Groves
Chris@16: //  Distributed under the Boost Software License, Version 1.0.
Chris@16: //  See accompanying file LICENSE_1_0.txt or copy at
Chris@16: //  http://www.boost.org/LICENSE_1_0.txt
Chris@16: //
Chris@16: // This code utilises the experience gained during the evolution of
Chris@16: // <boost/smart_ptr/operator_bool.hpp>
Chris@16: #ifndef BOOST_RANGE_SAFE_BOOL_INCLUDED_HPP
Chris@16: #define BOOST_RANGE_SAFE_BOOL_INCLUDED_HPP
Chris@16: 
Chris@16: #include <boost/config.hpp>
Chris@16: #include <boost/range/config.hpp>
Chris@16: 
Chris@16: namespace boost
Chris@16: {
Chris@16:     namespace range_detail
Chris@16:     {
Chris@16: 
Chris@16: template<class DataMemberPtr>
Chris@16: class safe_bool
Chris@16: {
Chris@16: public:
Chris@16:     typedef safe_bool this_type;
Chris@16: 
Chris@16: #if (defined(__SUNPRO_CC) && BOOST_WORKAROUND(__SUNPRO_CC, < 0x570)) || defined(__CINT_)
Chris@16:     typedef bool unspecified_bool_type;
Chris@16:     static unspecified_bool_type to_unspecified_bool(const bool x, DataMemberPtr)
Chris@16:     {
Chris@16:         return x;
Chris@16:     }
Chris@16: #elif defined(_MANAGED)
Chris@16:     static void unspecified_bool(this_type***)
Chris@16:     {
Chris@16:     }
Chris@16:     typedef void(*unspecified_bool_type)(this_type***);
Chris@16:     static unspecified_bool_type to_unspecified_bool(const bool x, DataMemberPtr)
Chris@16:     {
Chris@16:         return x ? unspecified_bool : 0;
Chris@16:     }
Chris@16: #elif \
Chris@16:     ( defined(__MWERKS__) && BOOST_WORKAROUND(__MWERKS__, < 0x3200) ) || \
Chris@16:     ( defined(__GNUC__) && (__GNUC__ * 100 + __GNUC_MINOR__ < 304) ) || \
Chris@16:     ( defined(__SUNPRO_CC) && BOOST_WORKAROUND(__SUNPRO_CC, <= 0x590) )
Chris@16: 
Chris@16:     typedef bool (this_type::*unspecified_bool_type)() const;
Chris@16: 
Chris@16:     static unspecified_bool_type to_unspecified_bool(const bool x, DataMemberPtr)
Chris@16:     {
Chris@16:         return x ? &this_type::detail_safe_bool_member_fn : 0;
Chris@16:     }
Chris@16: private:
Chris@16:     bool detail_safe_bool_member_fn() const { return false; }
Chris@16: #else
Chris@16:     typedef DataMemberPtr unspecified_bool_type;
Chris@16:     static unspecified_bool_type to_unspecified_bool(const bool x, DataMemberPtr p)
Chris@16:     {
Chris@16:         return x ? p : 0;
Chris@16:     }
Chris@16: #endif
Chris@16: private:
Chris@16:     safe_bool();
Chris@16:     safe_bool(const safe_bool&);
Chris@16:     void operator=(const safe_bool&);
Chris@16:     ~safe_bool();
Chris@16: };
Chris@16: 
Chris@16:     } // namespace range_detail
Chris@16: } // namespace boost
Chris@16: 
Chris@16: #endif // include guard