108 lines
4.3 KiB
C++
108 lines
4.3 KiB
C++
///\file
|
|
|
|
/******************************************************************************
|
|
The MIT License(MIT)
|
|
|
|
Embedded Template Library.
|
|
https://github.com/ETLCPP/etl
|
|
https://www.etlcpp.com
|
|
|
|
Copyright(c) 2018 John Wellbelove
|
|
|
|
Permission is hereby granted, free of charge, to any person obtaining a copy
|
|
of this software and associated documentation files(the "Software"), to deal
|
|
in the Software without restriction, including without limitation the rights
|
|
to use, copy, modify, merge, publish, distribute, sublicense, and / or sell
|
|
copies of the Software, and to permit persons to whom the Software is
|
|
furnished to do so, subject to the following conditions :
|
|
|
|
The above copyright notice and this permission notice shall be included in all
|
|
copies or substantial portions of the Software.
|
|
|
|
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
|
|
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
|
|
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.IN NO EVENT SHALL THE
|
|
AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
|
|
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
|
|
OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
|
|
SOFTWARE.
|
|
******************************************************************************/
|
|
|
|
#ifndef ETL_ABSOLUTE_INCLUDED
|
|
#define ETL_ABSOLUTE_INCLUDED
|
|
|
|
#include "platform.h"
|
|
#include "error_handler.h"
|
|
#include "integral_limits.h"
|
|
#include "type_traits.h"
|
|
|
|
namespace etl
|
|
{
|
|
namespace private_absolute
|
|
{
|
|
//*************************************************************************
|
|
// Non-constexpr function that is never called for valid inputs.
|
|
// If reached during constant evaluation, the compiler emits an error
|
|
// because it's not constexpr.
|
|
// At runtime, triggers the ETL assert handler.
|
|
//*************************************************************************
|
|
template <typename T>
|
|
inline T signed_min_error()
|
|
{
|
|
ETL_ASSERT_FAIL(ETL_ERROR_GENERIC("absolute value of minimum signed integer is undefined"));
|
|
return T(0);
|
|
}
|
|
} // namespace private_absolute
|
|
|
|
//***************************************************************************
|
|
// For signed types.
|
|
//***************************************************************************
|
|
template <typename T>
|
|
ETL_NODISCARD ETL_CONSTEXPR typename etl::enable_if< etl::is_signed<T>::value && etl::is_integral<T>::value, T>::type absolute(T value)
|
|
{
|
|
return (value == etl::integral_limits<T>::min) ? etl::private_absolute::signed_min_error<T>() : static_cast<T>((value < T(0)) ? -value : value);
|
|
}
|
|
|
|
template <typename T>
|
|
ETL_NODISCARD ETL_CONSTEXPR typename etl::enable_if< etl::is_signed<T>::value && !etl::is_integral<T>::value, T>::type absolute(T value)
|
|
ETL_NOEXCEPT
|
|
{
|
|
return (value < T(0)) ? -value : value;
|
|
}
|
|
|
|
//***************************************************************************
|
|
// For unsigned types.
|
|
//***************************************************************************
|
|
template <typename T>
|
|
ETL_NODISCARD ETL_CONSTEXPR typename etl::enable_if<etl::is_unsigned<T>::value, T>::type absolute(T value) ETL_NOEXCEPT
|
|
{
|
|
return value;
|
|
}
|
|
|
|
//***************************************************************************
|
|
// For signed types.
|
|
// Returns the result as the unsigned type.
|
|
//***************************************************************************
|
|
template <typename T>
|
|
ETL_NODISCARD ETL_CONSTEXPR typename etl::enable_if<etl::is_signed<T>::value, typename etl::make_unsigned<T>::type>::type absolute_unsigned(T value)
|
|
ETL_NOEXCEPT
|
|
{
|
|
typedef typename etl::make_unsigned<T>::type TReturn;
|
|
|
|
return (value == etl::integral_limits<T>::min) ? (etl::integral_limits<TReturn>::max / 2U) + 1U
|
|
: (value < T(0)) ? TReturn(-value)
|
|
: TReturn(value);
|
|
}
|
|
|
|
//***************************************************************************
|
|
// For unsigned types.
|
|
// Returns the result as the unsigned type.
|
|
//***************************************************************************
|
|
template <typename T>
|
|
ETL_NODISCARD ETL_CONSTEXPR typename etl::enable_if<etl::is_unsigned<T>::value, T>::type absolute_unsigned(T value) ETL_NOEXCEPT
|
|
{
|
|
return etl::absolute(value);
|
|
}
|
|
} // namespace etl
|
|
|
|
#endif
|