Added thirdparty: boost library

thirdparty/include/boost/ratio/detail/gcd_lcm.hpp

@@ -0,0 +1,53 @@
+#ifndef BOOST_RATIO_DETAIL_GCD_LCM_HPP
+#define BOOST_RATIO_DETAIL_GCD_LCM_HPP
+
+// Copyright 2023 Peter Dimov
+// Distributed under the Boost Software License, Version 1.0.
+// https://www.boost.org/LICENSE_1_0.txt
+
+#include <type_traits>
+#include <cstdint>
+
+namespace boost
+{
+namespace ratio_detail
+{
+
+template<std::intmax_t A> struct abs_: std::integral_constant<std::intmax_t, A < 0? -A: A>
+{
+};
+
+template<> struct abs_<INTMAX_MIN>: std::integral_constant<std::intmax_t, INTMAX_MIN>
+{
+};
+
+template<std::intmax_t A, std::intmax_t B> struct gcd_: public gcd_<B, A % B>
+{
+};
+
+template<std::intmax_t A> struct gcd_<A, 0>: std::integral_constant<std::intmax_t, A>
+{
+};
+
+template<std::intmax_t A, std::intmax_t B> struct lcm_: std::integral_constant<std::intmax_t, (A / gcd_<A, B>::value) * B>
+{
+};
+
+template<> struct lcm_<0, 0>: std::integral_constant<std::intmax_t, 0>
+{
+};
+
+//
+
+template<std::intmax_t A, std::intmax_t B> struct gcd: abs_< gcd_<A, B>::value >
+{
+};
+
+template<std::intmax_t A, std::intmax_t B> struct lcm: abs_< lcm_<A, B>::value >
+{
+};
+
+} // namespace ratio_detail
+} // namespace boost
+
+#endif // BOOST_RATIO_DETAIL_GCD_LCM_HPP