#include <limits>
#include <compare>
#include <cstdint>
#include <bit>
#include <cmath>
#include <numbers>
#include <functional>
#include <concepts>
#include <compare>
#include <cinttypes>
#include <cstdlib>
#include <type_traits>
#include <bit>
#include <string> // TODO
#include <bitset> // TODO
#include <iostream>
#include <assert.h>
namespace leviathan::math::numeric
{
template <typename T>
struct div_result
{
T quotient;
T remainder;
constexpr div_result(T quot, T rem) : quotient(quot), remainder(rem) { }
constexpr div_result(std::div_t x) : quotient(x.quot), remainder(x.rem) { }
constexpr div_result(std::ldiv_t x) : quotient(x.quot), remainder(x.rem) { }
constexpr div_result(std::lldiv_t x) : quotient(x.quot), remainder(x.rem) { }
constexpr div_result(std::imaxdiv_t x) : quotient(x.quot), remainder(x.rem) { }
};
template <bool Signed, std::endian Endian>
struct int128_layout
{
using lower_type = uint64_t;
using upper_type = std::conditional_t<Signed, int64_t, uint64_t>;
static constexpr bool lower_index = (Endian == std::endian::little);
uint64_t m_data[2];
constexpr int128_layout() = default;
constexpr int128_layout(upper_type upper, lower_type lower) : m_data{ static_cast<uint64_t>(upper), lower } { }
upper_type upper() const { return static_cast<upper_type>(m_data[1 - lower_index]); }
lower_type lower() const { return static_cast<lower_type>(m_data[lower_index]); }
};
template <std::endian Endian = std::endian::native> struct uint128;
template <std::endian Endian = std::endian::native> struct int128;
template <std::endian Endian>
class uint128 : int128_layout<false, Endian>
{
friend class int128<Endian>;
using base = int128_layout<false, Endian>;
template <typename T>
constexpr static uint128 make_uint128_from_float(T v)
{
// Undefined behavior if v is NaN or cannot fit into uint128.
assert(std::isfinite(v) && v >= 0 &&
(std::numeric_limits<T>::max_exponent <= 128 ||
v < std::ldexp(static_cast<T>(1), 128)));
if (v >= std::ldexp(static_cast<T>(1), 64))
{
const uint64_t hi = static_cast<uint64_t>(std::ldexp(v, -64));
const uint64_t lo = static_cast<uint64_t>(v - std::ldexp(static_cast<T>(hi), 64));
return uint128(hi, lo);
}
return uint128(0, static_cast<uint64_t>(v));
}
template <typename T>
constexpr static T make_float_from_uint128(uint128 x)
{
return static_cast<T>(x.lower())
+ std::ldexp(static_cast<T>(x.upper()), 64);
}
template <typename Fn>
constexpr static uint128 bit_op(Fn fn, uint128 u1, uint128 u2)
{
const auto hi = fn(u1.upper(), u2.upper());
const auto lo = fn(u1.lower(), u2.lower());
return uint128(hi, lo);
}
public:
constexpr uint128() = default;
constexpr uint128(const uint128&) = default;
constexpr uint128(uint64_t upper, uint64_t lower) : base(upper, lower) { }
constexpr uint128(int128<Endian> i128) : uint128(static_cast<uint64_t>(i128.upper()), i128.lower()) { }
// Constructors from unsigned types
constexpr uint128(uint64_t u) : uint128(0, u) { }
constexpr uint128(uint32_t u) : uint128(static_cast<uint64_t>(u)) { }
constexpr uint128(uint16_t u) : uint128(static_cast<uint64_t>(u)) { }
constexpr uint128(uint8_t u) : uint128(static_cast<uint64_t>(u)) { }
// Constructors from signed types
constexpr uint128(int64_t i) : uint128(std::signbit(i) ? std::numeric_limits<uint64_t>::max() : 0, i) { }
constexpr uint128(int32_t i) : uint128(static_cast<int64_t>(i)) { }
constexpr uint128(int16_t i) : uint128(static_cast<int64_t>(i)) { }
constexpr uint128(int8_t i) : uint128(static_cast<int64_t>(i)) { }
// Constructors from floating types
constexpr uint128(float f) : uint128(make_uint128_from_float(f)) { }
constexpr uint128(double d) : uint128(make_uint128_from_float(d)) { }
constexpr uint128(long double ld) : uint128(make_uint128_from_float(ld)) { }
// Assignment operator from arithmetic types
constexpr uint128& operator=(uint128 rhs)
{
this->m_data[0] = rhs.m_data[0];
this->m_data[1] = rhs.m_data[1];
return *this;
}
constexpr uint128& operator=(uint64_t u) { return *this = uint128(u); }
constexpr uint128& operator=(uint32_t u) { return *this = uint128(u); }
constexpr uint128& operator=(uint16_t u) { return *this = uint128(u); }
constexpr uint128& operator=(uint8_t u) { return *this = uint128(u); }
constexpr uint128& operator=(int64_t i) { return *this = uint128(i); }
constexpr uint128& operator=(int32_t i) { return *this = uint128(i); }
constexpr uint128& operator=(int16_t i) { return *this = uint128(i); }
constexpr uint128& operator=(int8_t i) { return *this = uint128(i); }
constexpr uint128& operator=(float f) { return *this = uint128(f); }
constexpr uint128& operator=(double d) { return *this = uint128(d); }
constexpr uint128& operator=(long double ld) { return *this = uint128(ld); }
// Conversion operators to other arithmetic types
constexpr explicit operator bool(this uint128 x) { return x.lower() || x.upper(); }
constexpr explicit operator char(this uint128 x) { return static_cast<char>(x.lower()); }
constexpr explicit operator wchar_t(this uint128 x) { return static_cast<wchar_t>(x.lower()); }
constexpr explicit operator char8_t(this uint128 x) { return static_cast<char8_t>(x.lower()); }
constexpr explicit operator char16_t(this uint128 x) { return static_cast<char16_t>(x.lower()); }
constexpr explicit operator char32_t(this uint128 x) { return static_cast<char32_t>(x.lower()); }
constexpr explicit operator int8_t(this uint128 x) { return static_cast<int8_t>(x.lower()); }
constexpr explicit operator int16_t(this uint128 x) { return static_cast<int16_t>(x.lower()); }
constexpr explicit operator int32_t(this uint128 x) { return static_cast<int32_t>(x.lower()); }
constexpr explicit operator int64_t(this uint128 x) { return static_cast<int64_t>(x.lower()); }
constexpr explicit operator int128<Endian>(this uint128 x)
{
return int128<Endian>(
static_cast<int64_t>(x.upper()),
x.lower()
);
}
constexpr explicit operator uint8_t(this uint128 x) { return static_cast<uint8_t>(x.lower()); }
constexpr explicit operator uint16_t(this uint128 x) { return static_cast<uint16_t>(x.lower()); }
constexpr explicit operator uint32_t(this uint128 x) { return static_cast<uint32_t>(x.lower()); }
constexpr explicit operator uint64_t(this uint128 x) { return static_cast<uint64_t>(x.lower()); }
constexpr explicit operator float(this uint128 x) { return make_float_from_uint128<float>(x); }
constexpr explicit operator double(this uint128 x) { return make_float_from_uint128<double>(x); }
constexpr explicit operator long double(this uint128 x) { return make_float_from_uint128<long double>(x); }
// Unary operators
constexpr uint128 operator+(this uint128 x) { return x; }
constexpr uint128 operator-(this uint128 x)
{
const auto hi = ~x.upper() + static_cast<uint64_t>(x.lower() == 0);
const auto lo = ~x.lower() + 1;
return uint128(hi, lo);
}
constexpr bool operator!(this uint128 x) { return !static_cast<bool>(x); }
constexpr uint128 operator~(this uint128 x) { return uint128(~x.upper(), ~x.lower()); }
// Binary operators
constexpr uint128 operator|(this uint128 lhs, uint128 rhs) { return bit_op(std::bit_or<>(), lhs, rhs); }
constexpr uint128 operator&(this uint128 lhs, uint128 rhs) { return bit_op(std::bit_and<>(), lhs, rhs); }
constexpr uint128 operator^(this uint128 lhs, uint128 rhs) { return bit_op(std::bit_xor<>(), lhs, rhs); }
constexpr uint128 operator+(this uint128 lhs, uint128 rhs)
{
const auto lo = lhs.lower() + rhs.lower();
const auto carry = (lo < lhs.lower() ? 1 : 0);
const auto hi = lhs.upper() + rhs.upper() + carry;
return uint128(hi, lo);
}
constexpr uint128 operator-(this uint128 lhs, uint128 rhs)
{
const auto lo = lhs.lower() - rhs.lower();
const auto carry = (lo <= lhs.lower() ? 0 : 1);
const auto hi = lhs.upper() - rhs.upper() - carry;
return uint128(hi, lo);
}
constexpr uint128 operator*(this uint128 lhs, uint128 rhs)
{
// We split uint128 into three parts:
// High64bit(H64), Low-High32bit(LH32) and Low-Low32bit(LL32)
// |----------------|--------|--------|
// 128 64 32 0
// H64 LH32 LL32
// L64
// A * B =
// H64(A) * H64(B) => Overflow
// H64(A) * L64(B) => H64
// L64(A) * H64(B) => H64
// L64(A) * L64(B) =
// LH32(A) * LH32(B) => H64
// LL32(A) * LH32(B) => H64 or L64
// LH32(A) * LL32(B) => H64 or L64
// LL32(A) * LL32(B) => L64
constexpr uint64_t mask = 0xffffffff; // mask low 64-bit
const uint64_t ah = lhs.lower() >> 32;
const uint64_t al = lhs.lower() & mask;
const uint64_t bh = rhs.lower() >> 32;
const uint64_t bl = rhs.lower() & mask;
const auto part_hi = lhs.upper() * rhs.lower() // H64(A) * L64(B)
+ lhs.lower() * rhs.upper() // L64(A) * H64(B)
+ ah * bh; // LH32(A) * LH32(B)
const auto part_lo = al * bl; // LL32(A) * LL32(B)
uint128 result(part_hi, part_lo);
result += uint128(ah * bl) << 32; // LH32(A) * LL32(B)
result += uint128(bh * al) << 32; // LL32(A) * LH32(B)
return result;
}
constexpr uint128 operator/(this uint128 lhs, uint128 rhs) { return div_mod(lhs, rhs).quotient; }
constexpr uint128 operator%(this uint128 lhs, uint128 rhs) { return div_mod(lhs, rhs).remainder; }
constexpr uint128 operator<<(this uint128 lhs, uint64_t amount)
{
// We use uint64_t instead of int to make amount non-negative.
// The result is undefined if the right operand is negative, or
// greater than or equal to the number of bits in the left expression's type.
assert(amount < 128 && "");
const auto hi = lhs.upper();
const auto lo = lhs.lower();
if (amount >= 64)
{
return uint128(lo << (amount - 64), 0);
}
else if (amount > 0)
{
return uint128((hi << amount) | (lo >> (64 - amount)), lo << amount);
}
else
{
return lhs;
}
}
constexpr uint128 operator>>(this uint128 lhs, uint64_t amount)
{
// We use uint64_t instead of int to make amount non-negative.
// The result is undefined if the right operand is negative, or
// greater than or equal to the number of bits in the left expression's type.
assert(amount < 128 && "");
const auto hi = lhs.upper();
const auto lo = lhs.lower();
if (amount >= 64)
{
return uint128(0, hi >> (amount - 64));
}
else if (amount > 0)
{
return uint128(hi >> amount, (lo >> amount) | (hi << (64 - amount)));
}
else
{
return lhs;
}
}
// Comparision
constexpr bool operator==(this uint128 lhs, uint128 rhs)
{
return lhs.lower() == rhs.lower()
&& lhs.upper() == rhs.upper();
}
constexpr auto operator<=>(this uint128 lhs, uint128 rhs)
{
return lhs.upper() != rhs.upper()
? lhs.upper() <=> rhs.upper()
: lhs.lower() <=> rhs.lower();
}
// Other operators
constexpr uint128& operator+=(uint128 rhs) { return *this = *this + rhs; }
constexpr uint128& operator-=(uint128 rhs) { return *this = *this - rhs; }
constexpr uint128& operator*=(uint128 rhs) { return *this = *this * rhs; }
constexpr uint128& operator/=(uint128 rhs) { return *this = *this / rhs; }
constexpr uint128& operator%=(uint128 rhs) { return *this = *this % rhs; }
constexpr uint128& operator|=(uint128 rhs) { return *this = *this | rhs; }
constexpr uint128& operator^=(uint128 rhs) { return *this = *this ^ rhs; }
constexpr uint128& operator&=(uint128 rhs) { return *this = *this & rhs; }
constexpr uint128& operator<<=(int amount) { return *this = *this << amount; }
constexpr uint128& operator>>=(int amount) { return *this = *this >> amount; }
constexpr uint128& operator++() { return *this = *this + 1; }
constexpr uint128& operator--() { return *this = *this - 1; }
constexpr uint128 operator++(int)
{
auto temp = *this;
++*this;
return temp;
}
constexpr uint128 operator--(int)
{
auto temp = *this;
--*this;
return temp;
}
// Bits
constexpr friend int popcount(uint128 x)
{
return std::popcount(x.lower())
+ std::popcount(x.upper());
}
friend constexpr bool has_single_bit(uint128 x) { return popcount(x) == 1; }
friend constexpr int countl_zero(uint128 x)
{
return x.upper() == 0
? std::countl_zero(x.lower()) + 64
: std::countl_zero(x.upper());
}
friend constexpr int countr_zero(uint128 x)
{
return x.lower() == 0
? std::countr_zero(x.upper()) + 64
: std::countr_zero(x.lower());
}
friend constexpr int countl_one(uint128 x)
{
return x.upper() == std::numeric_limits<uint64_t>::max()
? std::countl_one(x.lower()) + 64
: std::countl_one(x.upper());
}
friend constexpr int countr_one(uint128 x)
{
return x.lower() == std::numeric_limits<uint64_t>::max()
? std::countr_one(x.upper()) + 64
: std::countr_one(x.lower());
}
std::string to_string(this uint128 x)
{
return std::format("{}", x);
}
constexpr uint64_t hash_code(this uint128 x)
{
return hash_combine(x.upper(), x.lower());
}
static consteval uint128 max()
{
// 11111...11111
return uint128(
std::numeric_limits<uint64_t>::max(),
std::numeric_limits<uint64_t>::max()
);
}
static consteval uint128 min() { return uint128(0, 0); }
static constexpr div_result<uint128> div_mod(uint128 dividend, uint128 divisor)
{
assert(divisor != 0 && "dividend = quotient * divisor + remainder");
// https://stackoverflow.com/questions/5386377/division-without-using
if (divisor > dividend)
{
return { uint128(0), dividend };
}
if (divisor == dividend)
{
return { uint128(1), uint128(0) };
}
uint128 denominator = divisor;
uint128 current = 1;
uint128 answer = 0;
// Follow may be faster.
// const int shift = denominator.countl_zero() - dividend.countl_zero() + 1;
const int shift = countl_zero(denominator) - countl_zero(dividend) + 1;
denominator <<= shift;
current <<= shift;
// After loop, the current will be zero.
for (int i = 0; i <= shift; ++i)
{
if (dividend >= denominator)
{
dividend -= denominator;
answer |= current;
}
current >>= 1;
denominator >>= 1;
}
return { answer, dividend };
}
constexpr auto lower() const { return base::lower(); }
constexpr auto upper() const { return base::upper(); }
};
template <std::endian Endian>
class int128 : int128_layout<true, Endian>
{
friend class uint128<Endian>;
using base = int128_layout<true, Endian>;
template <typename T>
static constexpr int128 make_int128_from_float(T v)
{
// Conversion when v is NaN or cannot fit into int128 would be undefined
// behavior if using an intrinsic 128-bit integer.
assert(std::isfinite(v) && (std::numeric_limits<T>::max_exponent <= 127 ||
(v >= -std::ldexp(static_cast<T>(1), 127) &&
v < std::ldexp(static_cast<T>(1), 127))));
const uint128<Endian> result = signbit(v) ? -uint128<Endian>(-v) : uint128<Endian>(v);
return static_cast<int128>(result);
}
template <typename T>
static constexpr T make_float_from_int128(int128 x)
{
// We must convert the absolute value and then negate as needed, because
// floating point types are typically sign-magnitude. Otherwise, the
// difference between the high and low 64 bits when interpreted as two's
// complement overwhelms the precision of the mantissa.
//
// Also check to make sure we don't negate Int128Min()
return x.upper() < 0 && x != int128::min()
? -static_cast<T>(-x)
: static_cast<T>(x.lower()) + std::ldexp(static_cast<T>(x.upper()), 64);
}
template <typename Fn>
static constexpr int128 do_as_uint128(Fn fn, int128 x, int128 y)
{
const uint128<Endian> ux = x, uy = y;
return int128(fn(ux, uy));
}
public:
constexpr int128() = default;
constexpr int128(const int128&) = default;
constexpr int128(int64_t upper, uint64_t lower) : base(upper, lower) { }
constexpr int128(uint128<Endian> u128) : int128(static_cast<int64_t>(u128.upper()), u128.lower()) { }
// COnstructors from unsigned types
constexpr int128(uint64_t u) : int128(0, u) { }
constexpr int128(uint32_t u) : int128(static_cast<uint64_t>(u)) { }
constexpr int128(uint16_t u) : int128(static_cast<uint64_t>(u)) { }
constexpr int128(uint8_t u) : int128(static_cast<uint64_t>(u)) { }
// Constructors from signed types
constexpr int128(int64_t i) : int128((std::signbit(i) ? ~int64_t(0) : 0), static_cast<uint64_t>(i)) { }
constexpr int128(int32_t i) : int128(static_cast<int64_t>(i)) { }
constexpr int128(int16_t i) : int128(static_cast<int64_t>(i)) { }
constexpr int128(int8_t i) : int128(static_cast<int64_t>(i)) { }
// Constructors from floating types
constexpr int128(float f) : int128(make_int128_from_float(f)) { }
constexpr int128(double d) : int128(make_int128_from_float(d)) { }
constexpr int128(long double ld) : int128(make_int128_from_float(ld)) { }
constexpr int128& operator=(int128 rhs)
{
this->m_data[0] = rhs.m_data[0];
this->m_data[1] = rhs.m_data[1];
return *this;
}
constexpr int128& operator=(uint64_t u) { return *this = int128(u); }
constexpr int128& operator=(uint32_t u) { return *this = int128(u); }
constexpr int128& operator=(uint16_t u) { return *this = int128(u); }
constexpr int128& operator=(uint8_t u) { return *this = int128(u); }
constexpr int128& operator=(int64_t i) { return *this = int128(i); }
constexpr int128& operator=(int32_t i) { return *this = int128(i); }
constexpr int128& operator=(int16_t i) { return *this = int128(i); }
constexpr int128& operator=(int8_t i) { return *this = int128(i); }
constexpr int128& operator=(float f) { return *this = int128(f); }
constexpr int128& operator=(double d) { return *this = int128(d); }
constexpr int128& operator=(long double ld) { return *this = int128(ld); }
// Conversion operators to other arithmetic types
constexpr explicit operator bool(this int128 x) { return x.upper() || x.lower(); }
constexpr explicit operator char(this int128 x) { return static_cast<char>(static_cast<int64_t>(x)); }
constexpr explicit operator wchar_t(this int128 x) { return static_cast<wchar_t>(static_cast<int64_t>(x)); }
constexpr explicit operator char8_t(this int128 x) { return static_cast<char8_t>(x.lower()); }
constexpr explicit operator char16_t(this int128 x) { return static_cast<char16_t>(x.lower()); }
constexpr explicit operator char32_t(this int128 x) { return static_cast<char32_t>(x.lower()); }
constexpr explicit operator int8_t(this int128 x) { return static_cast<int8_t>(static_cast<int64_t>(x)); }
constexpr explicit operator int16_t(this int128 x) { return static_cast<int16_t>(static_cast<int64_t>(x)); }
constexpr explicit operator int32_t(this int128 x) { return static_cast<int32_t>(static_cast<int64_t>(x)); }
constexpr explicit operator int64_t(this int128 x) { return static_cast<int64_t>(x.lower()); }
constexpr explicit operator uint8_t(this int128 x) { return static_cast<uint8_t>(x.lower()); }
constexpr explicit operator uint16_t(this int128 x) { return static_cast<uint16_t>(x.lower()); }
constexpr explicit operator uint32_t(this int128 x) { return static_cast<uint32_t>(x.lower()); }
constexpr explicit operator uint64_t(this int128 x) { return static_cast<uint64_t>(x.lower()); }
constexpr explicit operator uint128<Endian>(this int128 x)
{
return uint128<Endian>(
static_cast<int64_t>(x.upper()),
x.lower()
);
}
constexpr explicit operator float(this int128 x) { return make_float_from_int128<float>(x); }
constexpr explicit operator double(this int128 x) { return make_float_from_int128<double>(x); }
constexpr explicit operator long double(this int128 x) { return make_float_from_int128<long double>(x); }
// Unary operators
constexpr int128 operator+(this int128 x) { return x; }
constexpr int128 operator-(this int128 x)
{
const uint128<Endian> u = x;
return -u;
}
constexpr bool operator!(this int128 x) { return !static_cast<bool>(x); }
constexpr int128 operator~(this int128 x) { return int128(~x.upper(), ~x.lower()); }
// Binary operators
constexpr int128 operator|(this int128 lhs, int128 rhs) { return do_as_uint128(std::bit_or<>(), lhs, rhs); }
constexpr int128 operator&(this int128 lhs, int128 rhs) { return do_as_uint128(std::bit_and<>(), lhs, rhs); }
constexpr int128 operator^(this int128 lhs, int128 rhs) { return do_as_uint128(std::bit_xor<>(), lhs, rhs); }
constexpr int128 operator+(this int128 lhs, int128 rhs) { return do_as_uint128(std::plus<>(), lhs, rhs); }
constexpr int128 operator-(this int128 lhs, int128 rhs) { return do_as_uint128(std::minus<>(), lhs, rhs); }
constexpr int128 operator*(this int128 lhs, int128 rhs) { return do_as_uint128(std::multiplies<>(), lhs, rhs); }
constexpr int128 operator/(this int128 lhs, int128 rhs) { return div_mod(lhs, rhs).quotient; }
constexpr int128 operator%(this int128 lhs, int128 rhs) { return div_mod(lhs, rhs).remainder; }
constexpr int128 operator<<(this int128 lhs, uint64_t amount)
{
// We use uint64_t instead of int to make amount non-negative.
// The result is undefined if the right operand is negative, or
// greater than or equal to the number of bits in the left expression's type.
assert(amount < 128 && "");
// The shift operation in signed integer and unsigned are same.
return static_cast<uint128<Endian>>(lhs) << amount;
}
// The only difference between signed and unsigned is right shift operation.
constexpr int128 operator>>(this int128 lhs, uint64_t amount)
{
// We use uint64_t instead of int to make amount non-negative.
// The result is undefined if the right operand is negative, or
// greater than or equal to the number of bits in the left expression's type.
assert(amount < 128 && "");
const auto result = static_cast<uint128<Endian>>(lhs) >> amount;
// Right-shift on signed integral types is an arithmetic right shift,
// which performs sign-extension. So we must keep sign bit when shifting
// signed integer.
if (signbit(lhs.upper()))
{
return result | (uint128<Endian>::max() << (127 - amount));
}
return result;
}
constexpr bool operator==(this int128 lhs, int128 rhs)
{
return lhs.upper() == rhs.upper()
&& lhs.lower() == rhs.lower();
}
constexpr auto operator<=>(this int128 lhs, int128 rhs)
{
return lhs.upper() == rhs.upper()
? lhs.lower() <=> rhs.lower()
: lhs.upper() <=> rhs.upper();
}
// Other operators
constexpr int128& operator+=(int128 rhs) { return *this = *this + rhs; }
constexpr int128& operator-=(int128 rhs) { return *this = *this - rhs; }
constexpr int128& operator*=(int128 rhs) { return *this = *this * rhs; }
constexpr int128& operator/=(int128 rhs) { return *this = *this / rhs; }
constexpr int128& operator%=(int128 rhs) { return *this = *this % rhs; }
constexpr int128& operator|=(int128 rhs) { return *this = *this | rhs; }
constexpr int128& operator^=(int128 rhs) { return *this = *this ^ rhs; }
constexpr int128& operator&=(int128 rhs) { return *this = *this & rhs; }
constexpr int128& operator<<=(int amount) { return *this = *this << amount; }
constexpr int128& operator>>=(int amount) { return *this = *this >> amount; }
constexpr int128& operator++() { return *this = *this + 1; }
constexpr int128& operator--() { return *this = *this - 1; }
constexpr int128 operator++(int)
{
auto temp = *this;
++*this;
return temp;
}
constexpr int128 operator--(int)
{
auto temp = *this;
--*this;
return temp;
}
constexpr size_t hash_code(this int128 x)
{
return hash_combine(x.upper(), x.lower());
}
static consteval int128 max()
{
// 0111111...111
return int128(
std::numeric_limits<int64_t>::max(),
std::numeric_limits<uint64_t>::max()
);
}
static consteval int128 min()
{
// 1000000...000
return int128(
std::numeric_limits<int64_t>::min(),
0
);
}
static constexpr div_result<int128> div_mod(int128 dividend, int128 divisor)
{
assert(dividend != int128::min() || divisor != -1);
const uint128<Endian> quotient = dividend < 0 ? -uint128<Endian>(dividend) : uint128<Endian>(dividend);
const uint128<Endian> remainder = divisor < 0 ? -uint128<Endian>(divisor) : uint128<Endian>(divisor);
const auto [quot, rem] = uint128<Endian>::div_mod(quotient, remainder);
return { static_cast<int128>(quot), static_cast<int128>(rem) };
}
std::string to_string(this int128 x)
{
return std::format("{}", x);
}
constexpr auto lower() const { return base::lower(); }
constexpr auto upper() const { return base::upper(); }
};
using int128_t = int128<>;
using uint128_t = uint128<>;
// template class uint128<>;
// template class int128<>;
template <std::endian Endian>
std::ostream& operator<<(std::ostream& os, uint128<Endian> x)
{
return os << x.to_string();
}
template <std::endian Endian>
std::ostream& operator<<(std::ostream& os, int128<Endian> x)
{
return os << x.to_string();
}
}
// Specialize for std::numeric_limits
template <std::endian Endian>
struct std::numeric_limits<leviathan::math::numeric::uint128<Endian>>
{
private:
using uint128 = leviathan::math::numeric::uint128<Endian>;
public:
static constexpr bool is_specialized = true;
static constexpr bool is_signed = false;
static constexpr bool is_integer = true;
static constexpr bool is_exact = true;
static constexpr bool has_infinity = false;
static constexpr bool has_quiet_NaN = false;
static constexpr bool has_signaling_NaN = false;
static constexpr std::float_denorm_style has_denorm = std::float_denorm_style::denorm_absent;
static constexpr bool has_denorm_loss = false;
static constexpr std::float_round_style round_style = std::float_round_style::round_toward_zero;
static constexpr bool is_iec559 = false;
static constexpr bool is_bounded = true;
static constexpr bool is_modulo = true;
static constexpr int digits = 128;
static constexpr int digits10 = 38;
static constexpr int max_digits10 = 0;
static constexpr int radix = 2;
static constexpr int min_exponent = 0;
static constexpr int min_exponent10 = 0;
static constexpr int max_exponent = 0;
static constexpr int max_exponent10 = 0;
static constexpr bool traps = std::numeric_limits<uint64_t>::traps;
static constexpr bool tinyness_before = false;
static constexpr uint128 min() { return uint128::min(); }
static constexpr uint128 lowest() { return 0; }
static constexpr uint128 max() { return uint128::max(); }
static constexpr uint128 epsilon() { return 0; }
static constexpr uint128 round_error() { return 0; }
static constexpr uint128 infinity() { return 0; }
static constexpr uint128 quiet_NaN() { return 0; }
static constexpr uint128 signaling_NaN() { return 0; }
static constexpr uint128 denorm_min() { return 0; }
};
template <std::endian Endian>
struct std::numeric_limits<leviathan::math::numeric::int128<Endian>>
{
private:
using int128 = leviathan::math::numeric::int128<Endian>;
public:
static constexpr bool is_specialized = true;
static constexpr bool is_signed = true;
static constexpr bool is_integer = true;
static constexpr bool is_exact = true;
static constexpr bool has_infinity = false;
static constexpr bool has_quiet_NaN = false;
static constexpr bool has_signaling_NaN = false;
static constexpr std::float_denorm_style has_denorm = std::float_denorm_style::denorm_absent;
static constexpr bool has_denorm_loss = false;
static constexpr std::float_round_style round_style = std::float_round_style::round_toward_zero;
static constexpr bool is_iec559 = false;
static constexpr bool is_bounded = true;
static constexpr bool is_modulo = false;
static constexpr int digits = 127;
static constexpr int digits10 = 38;
static constexpr int max_digits10 = 0;
static constexpr int radix = 2;
static constexpr int min_exponent = 0;
static constexpr int min_exponent10 = 0;
static constexpr int max_exponent = 0;
static constexpr int max_exponent10 = 0;
static constexpr bool traps = numeric_limits<uint64_t>::traps;
static constexpr bool tinyness_before = false;
static constexpr int128 min() { return int128::min(); }
static constexpr int128 lowest() { return int128::min(); }
static constexpr int128 max() { return int128::max(); }
static constexpr int128 epsilon() { return 0; }
static constexpr int128 round_error() { return 0; }
static constexpr int128 infinity() { return 0; }
static constexpr int128 quiet_NaN() { return 0; }
static constexpr int128 signaling_NaN() { return 0; }
static constexpr int128 denorm_min() { return 0; }
};
// Specialize for std::hash
template <std::endian Endian>
struct std::hash<leviathan::math::numeric::uint128<Endian>>
{
static constexpr auto operator()(leviathan::math::numeric::uint128<Endian> x)
{
return x.hash_code();
}
};
template <std::endian Endian>
struct std::hash<leviathan::math::numeric::int128<Endian>>
{
static constexpr auto operator()(leviathan::math::numeric::int128<Endian> x)
{
return x.hash_code();
}
};
// Specialize for std::formatter
template <std::endian Endian, typename CharT>
struct std::formatter<leviathan::math::numeric::uint128<Endian>, CharT>
{
using uint128 = leviathan::math::numeric::uint128<Endian>;
template <typename ParseContext>
constexpr typename ParseContext::iterator parse(ParseContext& ctx)
{
return m_fmt.parse(ctx);
}
template <typename FormatContext>
typename FormatContext::iterator format(uint128 x, FormatContext& ctx) const
{
unsigned __int128 v = (static_cast<unsigned __int128>(x.upper()) << 64)
| (static_cast<unsigned __int128>(x.lower()));
return m_fmt.format(v, ctx);
}
std::formatter<unsigned __int128, CharT> m_fmt;
};
template <std::endian Endian, typename CharT>
struct std::formatter<leviathan::math::numeric::int128<Endian>, CharT>
{
using int128 = leviathan::math::numeric::int128<Endian>;
template <typename ParseContext>
constexpr typename ParseContext::iterator parse(ParseContext& ctx)
{
return m_fmt.parse(ctx);
}
template <typename FormatContext>
typename FormatContext::iterator format(int128 x, FormatContext& ctx) const
{
signed __int128 v = (static_cast<signed __int128>(x.upper()) << 64)
| (static_cast<signed __int128>(x.lower()));
return m_fmt.format(v, ctx);
}
std::formatter<signed __int128, CharT> m_fmt;
};
namespace leviathan
{
using leviathan::math::numeric::uint128_t;
using leviathan::math::numeric::int128_t;
}
int main()
{
}
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