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261 lines
11 KiB
C++
261 lines
11 KiB
C++
#pragma once
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///////////////////////////////////////////////////////////////
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// Distributed under the Boost Software License, Version 1.0.
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// (See at http://www.boost.org/LICENSE_1_0.txt)
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///////////////////////////////////////////////////////////////
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/* Divide and multiply
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*
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*
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* Copyright (c) 2008
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* Evan Teran
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*
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* Permission to use, copy, modify, and distribute this software and its
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* documentation for any purpose and without fee is hereby granted, provided
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* that the above copyright notice appears in all copies and that both the
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* copyright notice and this permission notice appear in supporting
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* documentation, and that the same name not be used in advertising or
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* publicity pertaining to distribution of the software without specific,
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* written prior permission. We make no representations about the
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* suitability this software for any purpose. It is provided "as is"
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* without express or implied warranty.
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*/
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#include <cstdint>
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#include <limits>
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#include <type_traits>
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#include <initializer_list>
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namespace wide
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{
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template <size_t Bits, typename Signed>
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class integer;
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}
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namespace std
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{
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template <size_t Bits, typename Signed, size_t Bits2, typename Signed2>
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struct common_type<wide::integer<Bits, Signed>, wide::integer<Bits2, Signed2>>;
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template <size_t Bits, typename Signed, typename Arithmetic>
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struct common_type<wide::integer<Bits, Signed>, Arithmetic>;
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template <typename Arithmetic, size_t Bits, typename Signed>
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struct common_type<Arithmetic, wide::integer<Bits, Signed>>;
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}
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namespace wide
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{
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template <size_t Bits, typename Signed>
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class integer
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{
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public:
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using base_type = uint64_t;
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using signed_base_type = int64_t;
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// ctors
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constexpr integer() noexcept = default;
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template <typename T>
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constexpr integer(T rhs) noexcept;
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template <typename T>
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constexpr integer(std::initializer_list<T> il) noexcept;
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// assignment
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template <size_t Bits2, typename Signed2>
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constexpr integer<Bits, Signed> & operator=(const integer<Bits2, Signed2> & rhs) noexcept;
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template <typename Arithmetic>
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constexpr integer<Bits, Signed> & operator=(Arithmetic rhs) noexcept;
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template <typename Arithmetic>
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constexpr integer<Bits, Signed> & operator*=(const Arithmetic & rhs);
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template <typename Arithmetic>
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constexpr integer<Bits, Signed> & operator/=(const Arithmetic & rhs);
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template <typename Arithmetic>
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constexpr integer<Bits, Signed> & operator+=(const Arithmetic & rhs) noexcept(std::is_same_v<Signed, unsigned>);
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template <typename Arithmetic>
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constexpr integer<Bits, Signed> & operator-=(const Arithmetic & rhs) noexcept(std::is_same_v<Signed, unsigned>);
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template <typename Integral>
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constexpr integer<Bits, Signed> & operator%=(const Integral & rhs);
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template <typename Integral>
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constexpr integer<Bits, Signed> & operator&=(const Integral & rhs) noexcept;
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template <typename Integral>
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constexpr integer<Bits, Signed> & operator|=(const Integral & rhs) noexcept;
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template <typename Integral>
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constexpr integer<Bits, Signed> & operator^=(const Integral & rhs) noexcept;
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constexpr integer<Bits, Signed> & operator<<=(int n) noexcept;
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constexpr integer<Bits, Signed> & operator>>=(int n) noexcept;
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constexpr integer<Bits, Signed> & operator++() noexcept(std::is_same_v<Signed, unsigned>);
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constexpr integer<Bits, Signed> operator++(int) noexcept(std::is_same_v<Signed, unsigned>);
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constexpr integer<Bits, Signed> & operator--() noexcept(std::is_same_v<Signed, unsigned>);
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constexpr integer<Bits, Signed> operator--(int) noexcept(std::is_same_v<Signed, unsigned>);
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// observers
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constexpr explicit operator bool() const noexcept;
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template <typename T, typename = std::enable_if_t<std::is_arithmetic_v<T>, T>>
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constexpr operator T() const noexcept;
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constexpr operator long double() const noexcept;
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constexpr operator double() const noexcept;
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constexpr operator float() const noexcept;
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struct _impl;
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base_type items[_impl::item_count];
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private:
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template <size_t Bits2, typename Signed2>
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friend class integer;
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friend class std::numeric_limits<integer<Bits, signed>>;
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friend class std::numeric_limits<integer<Bits, unsigned>>;
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};
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template <typename T>
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static constexpr bool ArithmeticConcept() noexcept;
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template <class T1, class T2>
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using _only_arithmetic = typename std::enable_if<ArithmeticConcept<T1>() && ArithmeticConcept<T2>()>::type;
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template <typename T>
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static constexpr bool IntegralConcept() noexcept;
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template <class T, class T2>
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using _only_integer = typename std::enable_if<IntegralConcept<T>() && IntegralConcept<T2>()>::type;
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// Unary operators
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template <size_t Bits, typename Signed>
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constexpr integer<Bits, Signed> operator~(const integer<Bits, Signed> & lhs) noexcept;
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template <size_t Bits, typename Signed>
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constexpr integer<Bits, Signed> operator-(const integer<Bits, Signed> & lhs) noexcept(std::is_same_v<Signed, unsigned>);
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template <size_t Bits, typename Signed>
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constexpr integer<Bits, Signed> operator+(const integer<Bits, Signed> & lhs) noexcept(std::is_same_v<Signed, unsigned>);
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// Binary operators
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template <size_t Bits, typename Signed, size_t Bits2, typename Signed2>
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std::common_type_t<integer<Bits, Signed>, integer<Bits2, Signed2>> constexpr
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operator*(const integer<Bits, Signed> & lhs, const integer<Bits2, Signed2> & rhs);
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template <typename Arithmetic, typename Arithmetic2, class = _only_arithmetic<Arithmetic, Arithmetic2>>
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std::common_type_t<Arithmetic, Arithmetic2> constexpr operator*(const Arithmetic & rhs, const Arithmetic2 & lhs);
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template <size_t Bits, typename Signed, size_t Bits2, typename Signed2>
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std::common_type_t<integer<Bits, Signed>, integer<Bits2, Signed2>> constexpr
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operator/(const integer<Bits, Signed> & lhs, const integer<Bits2, Signed2> & rhs);
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template <typename Arithmetic, typename Arithmetic2, class = _only_arithmetic<Arithmetic, Arithmetic2>>
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std::common_type_t<Arithmetic, Arithmetic2> constexpr operator/(const Arithmetic & rhs, const Arithmetic2 & lhs);
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template <size_t Bits, typename Signed, size_t Bits2, typename Signed2>
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std::common_type_t<integer<Bits, Signed>, integer<Bits2, Signed2>> constexpr
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operator+(const integer<Bits, Signed> & lhs, const integer<Bits2, Signed2> & rhs);
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template <typename Arithmetic, typename Arithmetic2, class = _only_arithmetic<Arithmetic, Arithmetic2>>
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std::common_type_t<Arithmetic, Arithmetic2> constexpr operator+(const Arithmetic & rhs, const Arithmetic2 & lhs);
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template <size_t Bits, typename Signed, size_t Bits2, typename Signed2>
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std::common_type_t<integer<Bits, Signed>, integer<Bits2, Signed2>> constexpr
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operator-(const integer<Bits, Signed> & lhs, const integer<Bits2, Signed2> & rhs);
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template <typename Arithmetic, typename Arithmetic2, class = _only_arithmetic<Arithmetic, Arithmetic2>>
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std::common_type_t<Arithmetic, Arithmetic2> constexpr operator-(const Arithmetic & rhs, const Arithmetic2 & lhs);
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template <size_t Bits, typename Signed, size_t Bits2, typename Signed2>
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std::common_type_t<integer<Bits, Signed>, integer<Bits2, Signed2>> constexpr
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operator%(const integer<Bits, Signed> & lhs, const integer<Bits2, Signed2> & rhs);
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template <typename Integral, typename Integral2, class = _only_integer<Integral, Integral2>>
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std::common_type_t<Integral, Integral2> constexpr operator%(const Integral & rhs, const Integral2 & lhs);
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template <size_t Bits, typename Signed, size_t Bits2, typename Signed2>
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std::common_type_t<integer<Bits, Signed>, integer<Bits2, Signed2>> constexpr
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operator&(const integer<Bits, Signed> & lhs, const integer<Bits2, Signed2> & rhs);
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template <typename Integral, typename Integral2, class = _only_integer<Integral, Integral2>>
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std::common_type_t<Integral, Integral2> constexpr operator&(const Integral & rhs, const Integral2 & lhs);
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template <size_t Bits, typename Signed, size_t Bits2, typename Signed2>
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std::common_type_t<integer<Bits, Signed>, integer<Bits2, Signed2>> constexpr
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operator|(const integer<Bits, Signed> & lhs, const integer<Bits2, Signed2> & rhs);
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template <typename Integral, typename Integral2, class = _only_integer<Integral, Integral2>>
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std::common_type_t<Integral, Integral2> constexpr operator|(const Integral & rhs, const Integral2 & lhs);
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template <size_t Bits, typename Signed, size_t Bits2, typename Signed2>
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std::common_type_t<integer<Bits, Signed>, integer<Bits2, Signed2>> constexpr
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operator^(const integer<Bits, Signed> & lhs, const integer<Bits2, Signed2> & rhs);
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template <typename Integral, typename Integral2, class = _only_integer<Integral, Integral2>>
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std::common_type_t<Integral, Integral2> constexpr operator^(const Integral & rhs, const Integral2 & lhs);
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// TODO: Integral
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template <size_t Bits, typename Signed>
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constexpr integer<Bits, Signed> operator<<(const integer<Bits, Signed> & lhs, int n) noexcept;
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template <size_t Bits, typename Signed>
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constexpr integer<Bits, Signed> operator>>(const integer<Bits, Signed> & lhs, int n) noexcept;
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template <size_t Bits, typename Signed, typename Int, typename = std::enable_if_t<!std::is_same_v<Int, int>>>
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constexpr integer<Bits, Signed> operator<<(const integer<Bits, Signed> & lhs, Int n) noexcept
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{
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return lhs << int(n);
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}
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template <size_t Bits, typename Signed, typename Int, typename = std::enable_if_t<!std::is_same_v<Int, int>>>
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constexpr integer<Bits, Signed> operator>>(const integer<Bits, Signed> & lhs, Int n) noexcept
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{
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return lhs >> int(n);
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}
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template <size_t Bits, typename Signed, size_t Bits2, typename Signed2>
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constexpr bool operator<(const integer<Bits, Signed> & lhs, const integer<Bits2, Signed2> & rhs);
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template <typename Arithmetic, typename Arithmetic2, class = _only_arithmetic<Arithmetic, Arithmetic2>>
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constexpr bool operator<(const Arithmetic & rhs, const Arithmetic2 & lhs);
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template <size_t Bits, typename Signed, size_t Bits2, typename Signed2>
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constexpr bool operator>(const integer<Bits, Signed> & lhs, const integer<Bits2, Signed2> & rhs);
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template <typename Arithmetic, typename Arithmetic2, class = _only_arithmetic<Arithmetic, Arithmetic2>>
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constexpr bool operator>(const Arithmetic & rhs, const Arithmetic2 & lhs);
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template <size_t Bits, typename Signed, size_t Bits2, typename Signed2>
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constexpr bool operator<=(const integer<Bits, Signed> & lhs, const integer<Bits2, Signed2> & rhs);
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template <typename Arithmetic, typename Arithmetic2, class = _only_arithmetic<Arithmetic, Arithmetic2>>
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constexpr bool operator<=(const Arithmetic & rhs, const Arithmetic2 & lhs);
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template <size_t Bits, typename Signed, size_t Bits2, typename Signed2>
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constexpr bool operator>=(const integer<Bits, Signed> & lhs, const integer<Bits2, Signed2> & rhs);
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template <typename Arithmetic, typename Arithmetic2, class = _only_arithmetic<Arithmetic, Arithmetic2>>
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constexpr bool operator>=(const Arithmetic & rhs, const Arithmetic2 & lhs);
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template <size_t Bits, typename Signed, size_t Bits2, typename Signed2>
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constexpr bool operator==(const integer<Bits, Signed> & lhs, const integer<Bits2, Signed2> & rhs);
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template <typename Arithmetic, typename Arithmetic2, class = _only_arithmetic<Arithmetic, Arithmetic2>>
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constexpr bool operator==(const Arithmetic & rhs, const Arithmetic2 & lhs);
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template <size_t Bits, typename Signed, size_t Bits2, typename Signed2>
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constexpr bool operator!=(const integer<Bits, Signed> & lhs, const integer<Bits2, Signed2> & rhs);
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template <typename Arithmetic, typename Arithmetic2, class = _only_arithmetic<Arithmetic, Arithmetic2>>
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constexpr bool operator!=(const Arithmetic & rhs, const Arithmetic2 & lhs);
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}
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namespace std
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{
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template <size_t Bits, typename Signed>
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struct hash<wide::integer<Bits, Signed>>;
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}
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#include "wide_integer_impl.h"
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