97 lines
3.3 KiB
C
97 lines
3.3 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) 2018 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_ABSOLUTE_INCLUDED
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#define ETL_ABSOLUTE_INCLUDED
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#include "type_traits.h"
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#include "integral_limits.h"
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namespace etl
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{
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//***************************************************************************
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// For signed types.
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//***************************************************************************
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template <typename T>
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ETL_NODISCARD
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ETL_CONSTEXPR
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typename etl::enable_if<etl::is_signed<T>::value, T>::type
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absolute(T value) ETL_NOEXCEPT
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{
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return (value < T(0)) ? -value : value;
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}
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//***************************************************************************
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// For unsigned types.
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//***************************************************************************
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template <typename T>
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ETL_NODISCARD
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ETL_CONSTEXPR
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typename etl::enable_if<etl::is_unsigned<T>::value, T>::type
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absolute(T value) ETL_NOEXCEPT
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{
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return value;
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}
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//***************************************************************************
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// For signed types.
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// Returns the result as the unsigned type.
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//***************************************************************************
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#if ETL_USING_CPP11
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template <typename T, typename TReturn = typename etl::make_unsigned<T>::type>
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#else
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template <typename T, typename TReturn>
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#endif
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ETL_NODISCARD
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ETL_CONSTEXPR
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typename etl::enable_if<etl::is_signed<T>::value, TReturn>::type
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absolute_unsigned(T value) ETL_NOEXCEPT
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{
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return (value == etl::integral_limits<T>::min) ? (etl::integral_limits<TReturn>::max / 2U) + 1U
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: (value < T(0)) ? TReturn(-value) : TReturn(value);
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}
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//***************************************************************************
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// For unsigned types.
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// Returns the result as the unsigned type.
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//***************************************************************************
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template <typename T>
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ETL_NODISCARD
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ETL_CONSTEXPR
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typename etl::enable_if<etl::is_unsigned<T>::value, T>::type
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absolute_unsigned(T value) ETL_NOEXCEPT
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{
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return etl::absolute(value);
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}
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}
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#endif
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