54 lines
1.1 KiB
C++
54 lines
1.1 KiB
C++
#ifndef BOOST_RATIO_DETAIL_GCD_LCM_HPP
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#define BOOST_RATIO_DETAIL_GCD_LCM_HPP
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// Copyright 2023 Peter Dimov
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// Distributed under the Boost Software License, Version 1.0.
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// https://www.boost.org/LICENSE_1_0.txt
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#include <type_traits>
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#include <cstdint>
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namespace boost
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{
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namespace ratio_detail
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{
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template<std::intmax_t A> struct abs_: std::integral_constant<std::intmax_t, A < 0? -A: A>
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{
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};
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template<> struct abs_<INTMAX_MIN>: std::integral_constant<std::intmax_t, INTMAX_MIN>
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{
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};
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template<std::intmax_t A, std::intmax_t B> struct gcd_: public gcd_<B, A % B>
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{
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};
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template<std::intmax_t A> struct gcd_<A, 0>: std::integral_constant<std::intmax_t, A>
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{
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};
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template<std::intmax_t A, std::intmax_t B> struct lcm_: std::integral_constant<std::intmax_t, (A / gcd_<A, B>::value) * B>
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{
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};
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template<> struct lcm_<0, 0>: std::integral_constant<std::intmax_t, 0>
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{
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};
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//
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template<std::intmax_t A, std::intmax_t B> struct gcd: abs_< gcd_<A, B>::value >
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{
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};
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template<std::intmax_t A, std::intmax_t B> struct lcm: abs_< lcm_<A, B>::value >
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{
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};
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} // namespace ratio_detail
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} // namespace boost
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#endif // BOOST_RATIO_DETAIL_GCD_LCM_HPP
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