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61 lines
2.4 KiB
C++
61 lines
2.4 KiB
C++
/*
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* Copyright (c) 2017, Intel Corporation
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are met:
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*
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* * Redistributions of source code must retain the above copyright notice,
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* this list of conditions and the following disclaimer.
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* * Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* * Neither the name of Intel Corporation nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
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* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*/
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/**
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* \brief Ordered operators: provides all the other compare operators for types
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* that provide equal and less-than.
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*
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* This is similar to Boost's totally_ordered class, but much simpler and
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* without injecting the boost namespace into ADL lookup.
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*/
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#ifndef UTIL_OPERATORS_H
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#define UTIL_OPERATORS_H
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namespace ue2 {
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/**
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* \brief Ordered operators: provides all the other compare operators for types
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* that provide equal and less-than.
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*
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* Simply inherit from this class with your class name as its template
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* parameter.
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*/
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template<typename T>
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class totally_ordered {
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public:
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friend bool operator!=(const T &a, const T &b) { return !(a == b); }
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friend bool operator<=(const T &a, const T &b) { return !(b < a); }
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friend bool operator>(const T &a, const T &b) { return b < a; }
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friend bool operator>=(const T &a, const T &b) { return !(a < b); }
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};
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} // namespace
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#endif // UTIL_OPERATORS_H
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