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