Added thirdparty: boost library

thirdparty/include/boost/multiprecision/detail/digits.hpp

@@ -0,0 +1,49 @@
+///////////////////////////////////////////////////////////////
+//  Copyright 2012 John Maddock. Distributed under the Boost
+//  Software License, Version 1.0. (See accompanying file
+//  LICENSE_1_0.txt or copy at https://www.boost.org/LICENSE_1_0.txt
+
+#ifndef BOOST_MP_DETAIL_DIGITS_HPP
+#define BOOST_MP_DETAIL_DIGITS_HPP
+
+namespace boost { namespace multiprecision { namespace detail {
+
+inline constexpr unsigned long digits10_2_2(unsigned long d10)
+{
+   return (d10 * 1000uL) / 301uL + ((d10 * 1000uL) % 301 ? 2u : 1u);
+}
+
+inline constexpr unsigned long digits2_2_10(unsigned long d2)
+{
+   return (d2 * 301uL) / 1000uL;
+}
+
+
+#if ULONG_MAX != SIZE_MAX
+
+inline constexpr std::size_t digits10_2_2(std::size_t d10)
+{
+   return (d10 * 1000uL) / 301uL + ((d10 * 1000uL) % 301 ? 2u : 1u);
+}
+
+inline constexpr std::size_t digits2_2_10(std::size_t d2)
+{
+   return (d2 * 301uL) / 1000uL;
+}
+
+template <class I>
+inline constexpr typename std::enable_if<sizeof(I) <= sizeof(unsigned long), unsigned long>::type digits10_2_2(I d10)
+{
+   return digits10_2_2(static_cast<unsigned long>(d10));
+}
+
+template <class I>
+inline constexpr typename std::enable_if<sizeof(I) <= sizeof(unsigned long), unsigned long>::type digits2_2_10(I d10)
+{
+   return digits2_2_10(static_cast<unsigned long>(d10));
+}
+#endif
+
+}}} // namespace boost::multiprecision::detail
+
+#endif