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 ///////////////////////////////////////////////////////////////////////////////
 //  Copyright 2012 John Maddock.
 //  Copyright Christopher Kormanyos 2013. Distributed under the Boost
 //  Software License, Version 1.0. (See accompanying file
 //  LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
 //
 
 #ifndef BOOST_MP_UTYPE_HELPER_HPP
 #define BOOST_MP_UTYPE_HELPER_HPP
 
 #include <limits>
 #include <cstdint>
 
 namespace boost {
 namespace multiprecision {
 namespace detail {
 template <const unsigned>
 struct utype_helper
 {
    using exact = std::uint64_t;
 };
 template <>
 struct utype_helper<0U>
 {
    using exact = boost::uint8_t;
 };
 template <>
 struct utype_helper<1U>
 {
    using exact = boost::uint8_t;
 };
 template <>
 struct utype_helper<2U>
 {
    using exact = boost::uint8_t;
 };
 template <>
 struct utype_helper<3U>
 {
    using exact = boost::uint8_t;
 };
 template <>
 struct utype_helper<4U>
 {
    using exact = boost::uint8_t;
 };
 template <>
 struct utype_helper<5U>
 {
    using exact = boost::uint8_t;
 };
 template <>
 struct utype_helper<6U>
 {
    using exact = boost::uint8_t;
 };
 template <>
 struct utype_helper<7U>
 {
    using exact = boost::uint8_t;
 };
 template <>
 struct utype_helper<8U>
 {
    using exact = boost::uint8_t;
 };
 
 template <>
 struct utype_helper<9U>
 {
    using exact = std::uint16_t;
 };
 template <>
 struct utype_helper<10U>
 {
    using exact = std::uint16_t;
 };
 template <>
 struct utype_helper<11U>
 {
    using exact = std::uint16_t;
 };
 template <>
 struct utype_helper<12U>
 {
    using exact = std::uint16_t;
 };
 template <>
 struct utype_helper<13U>
 {
    using exact = std::uint16_t;
 };
 template <>
 struct utype_helper<14U>
 {
    using exact = std::uint16_t;
 };
 template <>
 struct utype_helper<15U>
 {
    using exact = std::uint16_t;
 };
 template <>
 struct utype_helper<16U>
 {
    using exact = std::uint16_t;
 };
 
 template <>
 struct utype_helper<17U>
 {
    using exact = std::uint32_t;
 };
 template <>
 struct utype_helper<18U>
 {
    using exact = std::uint32_t;
 };
 template <>
 struct utype_helper<19U>
 {
    using exact = std::uint32_t;
 };
 template <>
 struct utype_helper<20U>
 {
    using exact = std::uint32_t;
 };
 template <>
 struct utype_helper<21U>
 {
    using exact = std::uint32_t;
 };
 template <>
 struct utype_helper<22U>
 {
    using exact = std::uint32_t;
 };
 template <>
 struct utype_helper<23U>
 {
    using exact = std::uint32_t;
 };
 template <>
 struct utype_helper<24U>
 {
    using exact = std::uint32_t;
 };
 template <>
 struct utype_helper<25U>
 {
    using exact = std::uint32_t;
 };
 template <>
 struct utype_helper<26U>
 {
    using exact = std::uint32_t;
 };
 template <>
 struct utype_helper<27U>
 {
    using exact = std::uint32_t;
 };
 template <>
 struct utype_helper<28U>
 {
    using exact = std::uint32_t;
 };
 template <>
 struct utype_helper<29U>
 {
    using exact = std::uint32_t;
 };
 template <>
 struct utype_helper<30U>
 {
    using exact = std::uint32_t;
 };
 template <>
 struct utype_helper<31U>
 {
    using exact = std::uint32_t;
 };
 template <>
 struct utype_helper<32U>
 {
    using exact = std::uint32_t;
 };
 
 template <>
 struct utype_helper<33U>
 {
    using exact = std::uint64_t;
 };
 template <>
 struct utype_helper<34U>
 {
    using exact = std::uint64_t;
 };
 template <>
 struct utype_helper<35U>
 {
    using exact = std::uint64_t;
 };
 template <>
 struct utype_helper<36U>
 {
    using exact = std::uint64_t;
 };
 template <>
 struct utype_helper<37U>
 {
    using exact = std::uint64_t;
 };
 template <>
 struct utype_helper<38U>
 {
    using exact = std::uint64_t;
 };
 template <>
 struct utype_helper<39U>
 {
    using exact = std::uint64_t;
 };
 template <>
 struct utype_helper<40U>
 {
    using exact = std::uint64_t;
 };
 template <>
 struct utype_helper<41U>
 {
    using exact = std::uint64_t;
 };
 template <>
 struct utype_helper<42U>
 {
    using exact = std::uint64_t;
 };
 template <>
 struct utype_helper<43U>
 {
    using exact = std::uint64_t;
 };
 template <>
 struct utype_helper<44U>
 {
    using exact = std::uint64_t;
 };
 template <>
 struct utype_helper<45U>
 {
    using exact = std::uint64_t;
 };
 template <>
 struct utype_helper<46U>
 {
    using exact = std::uint64_t;
 };
 template <>
 struct utype_helper<47U>
 {
    using exact = std::uint64_t;
 };
 template <>
 struct utype_helper<48U>
 {
    using exact = std::uint64_t;
 };
 template <>
 struct utype_helper<49U>
 {
    using exact = std::uint64_t;
 };
 template <>
 struct utype_helper<50U>
 {
    using exact = std::uint64_t;
 };
 template <>
 struct utype_helper<51U>
 {
    using exact = std::uint64_t;
 };
 template <>
 struct utype_helper<52U>
 {
    using exact = std::uint64_t;
 };
 template <>
 struct utype_helper<53U>
 {
    using exact = std::uint64_t;
 };
 template <>
 struct utype_helper<54U>
 {
    using exact = std::uint64_t;
 };
 template <>
 struct utype_helper<55U>
 {
    using exact = std::uint64_t;
 };
 template <>
 struct utype_helper<56U>
 {
    using exact = std::uint64_t;
 };
 template <>
 struct utype_helper<57U>
 {
    using exact = std::uint64_t;
 };
 template <>
 struct utype_helper<58U>
 {
    using exact = std::uint64_t;
 };
 template <>
 struct utype_helper<59U>
 {
    using exact = std::uint64_t;
 };
 template <>
 struct utype_helper<60U>
 {
    using exact = std::uint64_t;
 };
 template <>
 struct utype_helper<61U>
 {
    using exact = std::uint64_t;
 };
 template <>
 struct utype_helper<62U>
 {
    using exact = std::uint64_t;
 };
 template <>
 struct utype_helper<63U>
 {
    using exact = std::uint64_t;
 };
 template <>
 struct utype_helper<64U>
 {
    using exact = std::uint64_t;
 };
 
 template <class unsigned_type>
 int utype_prior(unsigned_type ui)
 {
    // TBD: Implement a templated binary search for this.
    int priority_bit;
 
    unsigned_type priority_mask = unsigned_type(unsigned_type(1U) << (std::numeric_limits<unsigned_type>::digits - 1));
 
    for (priority_bit = std::numeric_limits<unsigned_type>::digits - 1; priority_bit >= 0; --priority_bit)
    {
       if (unsigned_type(priority_mask & ui) != unsigned_type(0U))
       {
          break;
       }
 
       priority_mask >>= 1;
    }
 
    return priority_bit;
 }
 
 }}} // namespace boost::multiprecision::detail
 
 #endif // BOOST_MP_UTYPE_HELPER_HPP

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