113 lines
3.6 KiB
C
113 lines
3.6 KiB
C
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///\file
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/******************************************************************************
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The MIT License(MIT)
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Embedded Template Library.
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https://github.com/ETLCPP/etl
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https://www.etlcpp.com
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Copyright(c) 2017 John Wellbelove
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Permission is hereby granted, free of charge, to any person obtaining a copy
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of this software and associated documentation files(the "Software"), to deal
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in the Software without restriction, including without limitation the rights
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to use, copy, modify, merge, publish, distribute, sublicense, and / or sell
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copies of the Software, and to permit persons to whom the Software is
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furnished to do so, subject to the following conditions :
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The above copyright notice and this permission notice shall be included in all
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copies or substantial portions of the Software.
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THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.IN NO EVENT SHALL THE
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AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
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SOFTWARE.
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******************************************************************************/
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#ifndef ETL_COMPARE_INCLUDED
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#define ETL_COMPARE_INCLUDED
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#include "platform.h"
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#include "parameter_type.h"
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#include "functional.h"
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//*****************************************************************************
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///\defgroup compare compare
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/// Comparisons only using less than operator
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///\ingroup utilities
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//*****************************************************************************
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namespace etl
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{
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//***************************************************************************
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/// Defines <=, >, >=, ==, !=, <=> in terms of <
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/// Default implementation of TLess is etl::less
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//***************************************************************************
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template <typename T, typename TLess = etl::less<T> >
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struct compare
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{
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enum cmp_result
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{
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Less = -1,
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Equal = 0,
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Greater = 1
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};
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typedef typename etl::parameter_type<T>::type first_argument_type;
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typedef typename etl::parameter_type<T>::type second_argument_type;
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static ETL_CONSTEXPR bool lt(first_argument_type lhs, second_argument_type rhs)
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{
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return TLess()(lhs, rhs);
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}
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static ETL_CONSTEXPR bool gt(first_argument_type lhs, second_argument_type rhs)
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{
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return TLess()(rhs, lhs);
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}
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static ETL_CONSTEXPR bool lte(first_argument_type lhs, second_argument_type rhs)
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{
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return !gt(lhs, rhs);
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}
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static ETL_CONSTEXPR bool gte(first_argument_type lhs, second_argument_type rhs)
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{
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return !lt(lhs, rhs);
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}
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static ETL_CONSTEXPR bool eq(first_argument_type lhs, second_argument_type rhs)
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{
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return gte(lhs, rhs) && lte(lhs, rhs);
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}
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static ETL_CONSTEXPR bool ne(first_argument_type lhs, second_argument_type rhs)
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{
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return !eq(lhs, rhs);
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}
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static ETL_CONSTEXPR cmp_result cmp(first_argument_type lhs, second_argument_type rhs)
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{
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return lt(lhs, rhs) ? Less : gt(lhs, rhs) ? Greater : Equal;
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}
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};
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//***************************************************************************
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/// Default implementation of TLess is etl::less
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//***************************************************************************
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#if ETL_USING_CPP11
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template <typename T, typename TLess = etl::less<T> >
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#else
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template <typename T, typename TLess>
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#endif
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ETL_CONSTEXPR14 int three_way_compare(const T& lhs, const T& rhs)
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{
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return etl::compare<T>::cmp(lhs, rhs);
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}
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}
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#endif
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