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/// \file
// Range v3 library
//
// Copyright Eric Niebler 2019-present
//
// Use, modification and distribution is subject to 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)
//
// Project home: https://github.com/ericniebler/range-v3
//
#ifndef RANGES_V3_ITERATOR_DIFFMAX_T_HPP
#define RANGES_V3_ITERATOR_DIFFMAX_T_HPP
#include <cstdint>
#include <iosfwd>
#include <limits>
#include <concepts/concepts.hpp>
#include <range/v3/range_fwd.hpp>
#include <range/v3/iterator/concepts.hpp>
#include <range/v3/detail/prologue.hpp>
RANGES_DIAGNOSTIC_PUSH
RANGES_DIAGNOSTIC_IGNORE_UNSIGNED_MATH
namespace ranges
{
/// \cond
namespace detail
{
struct diffmax_t
{
private:
bool neg_;
std::uintmax_t val_;
struct tag
{};
constexpr diffmax_t(tag, bool neg, std::uintmax_t val)
: neg_(val && neg)
, val_(val)
{}
/// \cond
constexpr void _check()
{
RANGES_ENSURE(!neg_ || val_);
}
static constexpr diffmax_t _normalize(bool neg, std::uintmax_t val)
{
return diffmax_t{tag{}, val && neg, val};
}
/// \endcond
public:
diffmax_t() = default;
template(typename T)(
requires integral<T>)
constexpr diffmax_t(T val) noexcept
: neg_(0 > val)
, val_(0 > val ? static_cast<std::uintmax_t>(-val)
: static_cast<std::uintmax_t>(val))
{}
friend constexpr bool operator<(diffmax_t a, diffmax_t b) noexcept
{
a._check();
b._check();
return a.neg_ ? (b.neg_ ? a.val_ > b.val_ : true)
: (b.neg_ ? false : a.val_ < b.val_);
}
friend constexpr bool operator>(diffmax_t a, diffmax_t b) noexcept
{
return b < a;
}
friend constexpr bool operator<=(diffmax_t a, diffmax_t b) noexcept
{
return !(b < a);
}
friend constexpr bool operator>=(diffmax_t a, diffmax_t b) noexcept
{
return !(a < b);
}
friend constexpr bool operator==(diffmax_t a, diffmax_t b) noexcept
{
a._check();
b._check();
return a.val_ == b.val_ && a.neg_ == b.neg_;
}
friend constexpr bool operator!=(diffmax_t a, diffmax_t b) noexcept
{
return !(a == b);
}
friend constexpr diffmax_t operator+(diffmax_t a) noexcept
{
return a;
}
friend constexpr diffmax_t operator-(diffmax_t a) noexcept
{
return _normalize(!a.neg_, a.val_);
}
friend constexpr diffmax_t operator+(diffmax_t a, diffmax_t b) noexcept
{
return a.neg_ == b.neg_
? diffmax_t{tag{}, a.neg_, a.val_ + b.val_}
: (a.neg_ ? (a.val_ > b.val_
? diffmax_t{tag{}, true, a.val_ - b.val_}
: diffmax_t{tag{}, false, b.val_ - a.val_})
: (b.val_ > a.val_
? diffmax_t{tag{}, true, b.val_ - a.val_}
: diffmax_t{tag{}, false, a.val_ - b.val_}));
}
friend constexpr diffmax_t operator-(diffmax_t a, diffmax_t b) noexcept
{
return a + -b;
}
friend constexpr diffmax_t operator*(diffmax_t a, diffmax_t b) noexcept
{
return _normalize(a.neg_ ^ b.neg_, a.val_ * b.val_);
}
friend constexpr diffmax_t operator/(diffmax_t a, diffmax_t b) noexcept
{
return _normalize(a.neg_ ^ b.neg_, a.val_ / b.val_);
}
friend constexpr diffmax_t operator%(diffmax_t a, diffmax_t b) noexcept
{
return _normalize(a.neg_, a.val_ % b.val_);
}
static constexpr std::uintmax_t compl_if(bool neg,
std::uintmax_t val) noexcept
{
return neg ? ~val + 1 : val;
}
friend constexpr diffmax_t operator&(diffmax_t a, diffmax_t b) noexcept
{
return _normalize(
a.neg_ && b.neg_,
compl_if(a.neg_ && b.neg_,
compl_if(a.neg_, a.val_) & compl_if(b.neg_, b.val_)));
}
friend constexpr diffmax_t operator|(diffmax_t a, diffmax_t b) noexcept
{
return _normalize(
a.neg_ || b.neg_,
compl_if(a.neg_ || b.neg_,
compl_if(a.neg_, a.val_) | compl_if(b.neg_, b.val_)));
}
friend constexpr diffmax_t operator^(diffmax_t a, diffmax_t b) noexcept
{
return _normalize(
bool(a.neg_ ^ b.neg_),
compl_if(bool(a.neg_ ^ b.neg_),
compl_if(a.neg_, a.val_) ^ compl_if(b.neg_, b.val_)));
}
friend constexpr diffmax_t operator<<(diffmax_t a, diffmax_t b) noexcept
{
RANGES_ENSURE(!a.neg_);
return b.neg_ ? diffmax_t{tag{}, false, a.val_ >> b.val_}
: diffmax_t{tag{}, false, a.val_ << b.val_};
}
friend constexpr diffmax_t operator>>(diffmax_t a, diffmax_t b) noexcept
{
return b.neg_ ? diffmax_t{tag{}, a.neg_, a.val_ << b.val_}
: diffmax_t{tag{}, a.neg_, a.val_ >> b.val_};
}
friend constexpr diffmax_t & operator+=(diffmax_t & a, diffmax_t b) noexcept
{
return (a = a + b);
}
friend constexpr diffmax_t & operator-=(diffmax_t & a, diffmax_t b) noexcept
{
return (a = a - b);
}
friend constexpr diffmax_t & operator*=(diffmax_t & a, diffmax_t b) noexcept
{
return (a = a * b);
}
friend constexpr diffmax_t & operator/=(diffmax_t & a, diffmax_t b) noexcept
{
return (a = a / b);
}
friend constexpr diffmax_t & operator%=(diffmax_t & a, diffmax_t b) noexcept
{
return (a = a % b);
}
friend constexpr diffmax_t & operator&=(diffmax_t & a, diffmax_t b) noexcept
{
return (a = a & b);
}
friend constexpr diffmax_t & operator|=(diffmax_t & a, diffmax_t b) noexcept
{
return (a = a | b);
}
friend constexpr diffmax_t & operator^=(diffmax_t & a, diffmax_t b) noexcept
{
return (a = a ^ b);
}
friend constexpr diffmax_t & operator<<=(diffmax_t & a, diffmax_t b) noexcept
{
a = (a << b);
return a;
}
friend constexpr diffmax_t & operator>>=(diffmax_t & a, diffmax_t b) noexcept
{
a = (a >> b);
return a;
}
template<typename T>
friend constexpr auto operator+=(T & a, diffmax_t b) noexcept
-> CPP_broken_friend_ret(T &)(
requires integral<T>)
{
return (a = static_cast<T>(diffmax_t{a} + b));
}
template<typename T>
friend constexpr auto operator-=(T & a, diffmax_t b) noexcept
-> CPP_broken_friend_ret(T &)(
requires integral<T>)
{
return (a = static_cast<T>(diffmax_t{a} - b));
}
template<typename T>
friend constexpr auto operator*=(T & a, diffmax_t b) noexcept
-> CPP_broken_friend_ret(T &)(
requires integral<T>)
{
return (a = static_cast<T>(diffmax_t{a} * b));
}
template<typename T>
friend constexpr auto operator/=(T & a, diffmax_t b) noexcept
-> CPP_broken_friend_ret(T &)(
requires integral<T>)
{
return (a = static_cast<T>(diffmax_t{a} / b));
}
template<typename T>
friend constexpr auto operator%=(T & a, diffmax_t b) noexcept
-> CPP_broken_friend_ret(T &)(
requires integral<T>)
{
return (a = static_cast<T>(diffmax_t{a} % b));
}
template<typename T>
friend constexpr auto operator&=(T & a, diffmax_t b) noexcept
-> CPP_broken_friend_ret(T &)(
requires integral<T>)
{
return (a = static_cast<T>(diffmax_t{a} & b));
}
template<typename T>
friend constexpr auto operator|=(T & a, diffmax_t b) noexcept
-> CPP_broken_friend_ret(T &)(
requires integral<T>)
{
return (a = static_cast<T>(diffmax_t{a} | b));
}
template<typename T>
friend constexpr auto operator^=(T & a, diffmax_t b) noexcept
-> CPP_broken_friend_ret(T &)(
requires integral<T>)
{
return (a = static_cast<T>(diffmax_t{a} ^ b));
}
template<typename T>
friend constexpr auto operator<<=(T & a, diffmax_t b) noexcept
-> CPP_broken_friend_ret(T &)(
requires integral<T>)
{
a = static_cast<T>(diffmax_t{a} << b);
return a;
}
template<typename T>
friend constexpr auto operator>>=(T & a, diffmax_t b) noexcept
-> CPP_broken_friend_ret(T &)(
requires integral<T>)
{
a = static_cast<T>(diffmax_t{a} >> b);
return a;
}
friend constexpr diffmax_t & operator++(diffmax_t & a) noexcept
{
a.neg_ = (a.neg_ ? --a.val_ : ++a.val_) && a.neg_;
return a;
}
friend constexpr diffmax_t & operator--(diffmax_t & a) noexcept
{
a.neg_ = (a.neg_ ? ++a.val_ : --a.val_) && a.neg_;
return a;
}
friend constexpr diffmax_t operator++(diffmax_t & a, int) noexcept
{
auto tmp = a;
++a;
return tmp;
}
friend constexpr diffmax_t operator--(diffmax_t & a, int) noexcept
{
auto tmp = a;
--a;
return tmp;
}
template(typename T)(
requires integral<T>)
constexpr explicit
operator T() const noexcept
{
return neg_ ? -static_cast<T>(val_) : static_cast<T>(val_);
}
constexpr explicit operator bool() const noexcept
{
return val_ != 0;
}
constexpr bool operator!() const noexcept
{
return val_ == 0;
}
template<typename Ostream>
friend auto operator<<(Ostream & sout, diffmax_t a)
-> CPP_broken_friend_ret(std::ostream &)(
requires derived_from<
Ostream, std::basic_ostream<typename Ostream::char_type,
typename Ostream::traits_type>>)
{
return sout << (&"-"[!a.neg_]) << a.val_;
}
};
#if RANGES_CXX_INLINE_VARIABLES >= RANGES_CXX_INLINE_VARIABLES_17
template<>
inline constexpr bool _is_integer_like_<diffmax_t> = true;
#else
template<typename Enable>
constexpr bool _is_integer_like_<diffmax_t, Enable> = true;
#endif
} // namespace detail
/// \endcond
} // namespace ranges
/// \cond
RANGES_DIAGNOSTIC_IGNORE_MISMATCHED_TAGS
namespace std
{
template<>
struct numeric_limits<::ranges::detail::diffmax_t>
{
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 bool has_denorm = false;
static constexpr bool has_denorm_loss = false;
static constexpr std::float_round_style round_style = std::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 = CHAR_BIT * sizeof(std::uintmax_t) + 1;
static constexpr int digits10 =
static_cast<int>(digits * 0.301029996); // digits * std::log10(2)
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 = true;
static constexpr bool tinyness_before = false;
static constexpr ::ranges::detail::diffmax_t max() noexcept
{
return std::uintmax_t(-1);
}
static constexpr ::ranges::detail::diffmax_t min() noexcept
{
return -max();
}
static constexpr ::ranges::detail::diffmax_t lowest() noexcept
{
return min();
}
static constexpr ::ranges::detail::diffmax_t epsilon() noexcept
{
return 0;
}
static constexpr ::ranges::detail::diffmax_t round_error() noexcept
{
return 0;
}
static constexpr ::ranges::detail::diffmax_t infinity() noexcept
{
return 0;
}
static constexpr ::ranges::detail::diffmax_t quiet_NaN() noexcept
{
return 0;
}
static constexpr ::ranges::detail::diffmax_t signaling_NaN() noexcept
{
return 0;
}
static constexpr ::ranges::detail::diffmax_t denorm_min() noexcept
{
return 0;
}
};
template<>
struct numeric_limits<::ranges::detail::diffmax_t const>
: numeric_limits<::ranges::detail::diffmax_t>
{};
template<>
struct numeric_limits<::ranges::detail::diffmax_t volatile>
: numeric_limits<::ranges::detail::diffmax_t>
{};
template<>
struct numeric_limits<::ranges::detail::diffmax_t const volatile>
: numeric_limits<::ranges::detail::diffmax_t>
{};
#if RANGES_CXX_INLINE_VARIABLES >= RANGES_CXX_INLINE_VARIABLES_17
inline constexpr bool numeric_limits<::ranges::detail::diffmax_t>::is_specialized;
inline constexpr bool numeric_limits<::ranges::detail::diffmax_t>::is_signed;
inline constexpr bool numeric_limits<::ranges::detail::diffmax_t>::is_integer;
inline constexpr bool numeric_limits<::ranges::detail::diffmax_t>::is_exact;
inline constexpr bool numeric_limits<::ranges::detail::diffmax_t>::has_infinity;
inline constexpr bool numeric_limits<::ranges::detail::diffmax_t>::has_quiet_NaN;
inline constexpr bool numeric_limits<::ranges::detail::diffmax_t>::has_signaling_NaN;
inline constexpr bool numeric_limits<::ranges::detail::diffmax_t>::has_denorm;
inline constexpr bool numeric_limits<::ranges::detail::diffmax_t>::has_denorm_loss;
inline constexpr std::float_round_style
numeric_limits<::ranges::detail::diffmax_t>::round_style;
inline constexpr bool numeric_limits<::ranges::detail::diffmax_t>::is_iec559;
inline constexpr bool numeric_limits<::ranges::detail::diffmax_t>::is_bounded;
inline constexpr bool numeric_limits<::ranges::detail::diffmax_t>::is_modulo;
inline constexpr int numeric_limits<::ranges::detail::diffmax_t>::digits;
inline constexpr int numeric_limits<::ranges::detail::diffmax_t>::digits10;
inline constexpr int numeric_limits<::ranges::detail::diffmax_t>::max_digits10;
inline constexpr int numeric_limits<::ranges::detail::diffmax_t>::radix;
inline constexpr int numeric_limits<::ranges::detail::diffmax_t>::min_exponent;
inline constexpr int numeric_limits<::ranges::detail::diffmax_t>::min_exponent10;
inline constexpr int numeric_limits<::ranges::detail::diffmax_t>::max_exponent;
inline constexpr int numeric_limits<::ranges::detail::diffmax_t>::max_exponent10;
inline constexpr bool numeric_limits<::ranges::detail::diffmax_t>::traps;
inline constexpr bool numeric_limits<::ranges::detail::diffmax_t>::tinyness_before;
#endif
} // namespace std
/// \endcond
RANGES_DIAGNOSTIC_POP
#include <range/v3/detail/epilogue.hpp>
#endif
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