164 lines
4.8 KiB
C++
164 lines
4.8 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 http://www.boost.org/LICENSE_1_
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#ifndef BOOST_MP_CPP_INT_CORE_HPP
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#define BOOST_MP_CPP_INT_CORE_HPP
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#include <boost/integer.hpp>
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#include <boost/integer_traits.hpp>
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#include <boost/mpl/if.hpp>
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#include <boost/mpl/int.hpp>
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#include <boost/static_assert.hpp>
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#include <boost/assert.hpp>
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namespace boost{ namespace multiprecision{
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namespace detail{
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//
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// These traits calculate the largest type in the list
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// [unsigned] long long, long, int, which has the specified number
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// of bits. Note that intN_t and boost::int_t<N> find the first
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// member of the above list, not the last. We want the last in the
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// list to ensure that mixed arithmetic operations are as efficient
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// as possible.
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//
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template <unsigned N>
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struct largest_signed_type
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{
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typedef typename mpl::if_c<
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1 + std::numeric_limits<long long>::digits == N,
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long long,
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typename mpl::if_c<
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1 + std::numeric_limits<long>::digits == N,
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long,
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typename mpl::if_c<
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1 + std::numeric_limits<int>::digits == N,
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int,
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typename boost::int_t<N>::exact
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>::type
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>::type
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>::type type;
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};
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template <unsigned N>
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struct largest_unsigned_type
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{
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typedef typename mpl::if_c<
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std::numeric_limits<unsigned long long>::digits == N,
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unsigned long long,
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typename mpl::if_c<
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std::numeric_limits<unsigned long>::digits == N,
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unsigned long,
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typename mpl::if_c<
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std::numeric_limits<unsigned int>::digits == N,
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unsigned int,
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typename boost::uint_t<N>::exact
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>::type
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>::type
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>::type type;
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};
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} // namespace detail
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#if defined(BOOST_HAS_INT128)
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typedef detail::largest_unsigned_type<64>::type limb_type;
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typedef detail::largest_signed_type<64>::type signed_limb_type;
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typedef boost::uint128_type double_limb_type;
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typedef boost::int128_type signed_double_limb_type;
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static const limb_type max_block_10 = 1000000000000000000uLL;
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static const limb_type digits_per_block_10 = 18;
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inline limb_type block_multiplier(unsigned count)
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{
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static const limb_type values[digits_per_block_10]
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= { 10, 100, 1000, 10000, 100000, 1000000, 10000000, 100000000, 1000000000, 10000000000, 100000000000, 1000000000000, 10000000000000, 100000000000000, 1000000000000000, 10000000000000000, 100000000000000000, 1000000000000000000 };
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BOOST_ASSERT(count < digits_per_block_10);
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return values[count];
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}
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// Can't do formatted IO on an __int128
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#define BOOST_MP_NO_DOUBLE_LIMB_TYPE_IO
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// Need to specialise integer_traits for __int128 as it's not a normal native type:
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} // namespace multiprecision
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template<>
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class integer_traits<multiprecision::double_limb_type>
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: public std::numeric_limits<multiprecision::double_limb_type>,
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public detail::integer_traits_base<multiprecision::double_limb_type, 0, ~static_cast<multiprecision::double_limb_type>(0)>
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{ };
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template<>
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class integer_traits<multiprecision::signed_double_limb_type>
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: public std::numeric_limits<multiprecision::signed_double_limb_type>,
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public detail::integer_traits_base<multiprecision::signed_double_limb_type, static_cast<multiprecision::signed_double_limb_type>((static_cast<multiprecision::double_limb_type>(1) << 127)), static_cast<multiprecision::signed_double_limb_type>(((~static_cast<multiprecision::double_limb_type>(0)) >> 1))>
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{ };
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namespace multiprecision{
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#else
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typedef detail::largest_unsigned_type<32>::type limb_type;
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typedef detail::largest_signed_type<32>::type signed_limb_type;
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typedef boost::uint64_t double_limb_type;
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typedef boost::int64_t signed_double_limb_type;
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static const limb_type max_block_10 = 1000000000;
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static const limb_type digits_per_block_10 = 9;
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inline limb_type block_multiplier(unsigned count)
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{
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static const limb_type values[digits_per_block_10]
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= { 10, 100, 1000, 10000, 100000, 1000000, 10000000, 100000000, 1000000000 };
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BOOST_ASSERT(count < digits_per_block_10);
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return values[count];
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}
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#endif
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static const unsigned bits_per_limb = sizeof(limb_type) * CHAR_BIT;
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template <class T>
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inline void minmax(const T& a, const T& b, T& aa, T& bb)
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{
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if(a < b)
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{
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aa = a;
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bb = b;
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}
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else
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{
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aa = b;
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bb = a;
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}
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}
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enum cpp_integer_type
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{
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signed_magnitude = 1,
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unsigned_magnitude = 0,
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signed_packed = 3,
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unsigned_packed = 2
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};
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enum cpp_int_check_type
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{
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checked = 1,
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unchecked = 0
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};
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}}
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//
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// Figure out whether to support user-defined-literals or not:
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//
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#if !defined(BOOST_NO_CXX11_VARIADIC_TEMPLATES) && !defined(BOOST_NO_CXX11_USER_DEFINED_LITERALS) \
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&& !defined(BOOST_NO_CXX11_CONSTEXPR)
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# define BOOST_MP_USER_DEFINED_LITERALS
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#endif
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#endif // BOOST_MP_CPP_INT_CORE_HPP
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