Added thirdparty: boost library

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

@@ -0,0 +1,32 @@
+#ifndef BOOST_RATIO_DETAIL_IS_EVENLY_DIVISIBLE_BY_HPP
+#define BOOST_RATIO_DETAIL_IS_EVENLY_DIVISIBLE_BY_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, std::intmax_t B> struct is_evenly_divisible_by_: std::integral_constant<bool, A % B == 0>
+{
+};
+
+template<std::intmax_t A> struct is_evenly_divisible_by_<A, 0>: std::false_type
+{
+};
+
+template<class R1, class R2> struct is_evenly_divisible_by: std::integral_constant<bool,
+    is_evenly_divisible_by_<R1::num, R2::num>::value && is_evenly_divisible_by_<R2::den, R1::den>::value>
+{
+};
+
+} // namespace ratio_detail
+} // namespace boost
+
+#endif // BOOST_RATIO_DETAIL_IS_EVENLY_DIVISIBLE_BY_HPP