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