mirror of
https://github.com/bolero-MURAKAMI/Sprout
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68 lines
1.7 KiB
C++
68 lines
1.7 KiB
C++
/*=============================================================================
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Copyright (c) 2011 RiSK (sscrisk)
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https://github.com/sscrisk/CEL---ConstExpr-Library
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Copyright (c) 2011-2015 Bolero MURAKAMI
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https://github.com/bolero-MURAKAMI/Sprout
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Distributed under the Boost Software License, Version 1.0. (See accompanying
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file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
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=============================================================================*/
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#ifndef SPROUT_CSTDLIB_ABS_HPP
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#define SPROUT_CSTDLIB_ABS_HPP
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#include <type_traits>
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#include <sprout/config.hpp>
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#include <sprout/type_traits/is_signed.hpp>
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#include <sprout/type_traits/is_unsigned.hpp>
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namespace sprout {
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// 7.20.6.1 abs<62>Clabs<62>C‹y‚Ñ llabs ŠÖ<C5A0>”
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inline SPROUT_CONSTEXPR int
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abs(int j) {
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return j < 0 ? -j : j;
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}
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inline SPROUT_CONSTEXPR long
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labs(long j) {
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return j < 0 ? -j : j;
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}
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inline SPROUT_CONSTEXPR long long
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llabs(long long j) {
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return j < 0 ? -j : j;
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}
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inline SPROUT_CONSTEXPR long
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abs(long j) {
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return sprout::labs(j);
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}
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inline SPROUT_CONSTEXPR long long
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abs(long long j) {
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return sprout::llabs(j);
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}
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namespace {
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template<typename IntType>
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inline SPROUT_CONSTEXPR typename std::enable_if<
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std::is_integral<IntType>::value && sprout::is_signed<IntType>::value,
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IntType
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>::type
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abs(IntType j) {
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return j < 0 ? -j : j;
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}
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template<typename IntType>
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inline SPROUT_CONSTEXPR typename std::enable_if<
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std::is_integral<IntType>::value && sprout::is_unsigned<IntType>::value,
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IntType
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>::type
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abs(IntType j) {
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return j;
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}
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} // anonymous-namespace
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} // namespace sprout
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#endif // #ifndef SPROUT_CSTDLIB_ABS_HPP
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