llvm-project/libcxx/include/compare

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// -*- C++ -*-
//===-------------------------- compare -----------------------------------===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
#ifndef _LIBCPP_COMPARE
#define _LIBCPP_COMPARE
/*
compare synopsis
namespace std {
// [cmp.categories], comparison category types
class weak_equality;
class strong_equality;
class partial_ordering;
class weak_ordering;
class strong_ordering;
// named comparison functions
constexpr bool is_eq (weak_equality cmp) noexcept { return cmp == 0; }
constexpr bool is_neq (weak_equality cmp) noexcept { return cmp != 0; }
constexpr bool is_lt (partial_ordering cmp) noexcept { return cmp < 0; }
constexpr bool is_lteq(partial_ordering cmp) noexcept { return cmp <= 0; }
constexpr bool is_gt (partial_ordering cmp) noexcept { return cmp > 0; }
constexpr bool is_gteq(partial_ordering cmp) noexcept { return cmp >= 0; }
// [cmp.common], common comparison category type
template<class... Ts>
struct common_comparison_category {
using type = see below;
};
template<class... Ts>
using common_comparison_category_t = typename common_comparison_category<Ts...>::type;
// [cmp.alg], comparison algorithms
template<class T> constexpr strong_ordering strong_order(const T& a, const T& b);
template<class T> constexpr weak_ordering weak_order(const T& a, const T& b);
template<class T> constexpr partial_ordering partial_order(const T& a, const T& b);
template<class T> constexpr strong_equality strong_equal(const T& a, const T& b);
template<class T> constexpr weak_equality weak_equal(const T& a, const T& b);
// [cmp.partialord], Class partial_ordering
class partial_ordering {
public:
// valid values
static const partial_ordering less;
static const partial_ordering equivalent;
static const partial_ordering greater;
static const partial_ordering unordered;
// comparisons
friend constexpr bool operator==(partial_ordering v, unspecified) noexcept;
friend constexpr bool operator==(partial_ordering v, partial_ordering w) noexcept = default;
friend constexpr bool operator< (partial_ordering v, unspecified) noexcept;
friend constexpr bool operator> (partial_ordering v, unspecified) noexcept;
friend constexpr bool operator<=(partial_ordering v, unspecified) noexcept;
friend constexpr bool operator>=(partial_ordering v, unspecified) noexcept;
friend constexpr bool operator< (unspecified, partial_ordering v) noexcept;
friend constexpr bool operator> (unspecified, partial_ordering v) noexcept;
friend constexpr bool operator<=(unspecified, partial_ordering v) noexcept;
friend constexpr bool operator>=(unspecified, partial_ordering v) noexcept;
friend constexpr partial_ordering operator<=>(partial_ordering v, unspecified) noexcept;
friend constexpr partial_ordering operator<=>(unspecified, partial_ordering v) noexcept;
};
// [cmp.weakord], Class weak_ordering
class weak_ordering {
public:
// valid values
static const weak_ordering less;
static const weak_ordering equivalent;
static const weak_ordering greater;
// conversions
constexpr operator partial_ordering() const noexcept;
// comparisons
friend constexpr bool operator==(weak_ordering v, unspecified) noexcept;
friend constexpr bool operator==(weak_ordering v, weak_ordering w) noexcept = default;
friend constexpr bool operator< (weak_ordering v, unspecified) noexcept;
friend constexpr bool operator> (weak_ordering v, unspecified) noexcept;
friend constexpr bool operator<=(weak_ordering v, unspecified) noexcept;
friend constexpr bool operator>=(weak_ordering v, unspecified) noexcept;
friend constexpr bool operator< (unspecified, weak_ordering v) noexcept;
friend constexpr bool operator> (unspecified, weak_ordering v) noexcept;
friend constexpr bool operator<=(unspecified, weak_ordering v) noexcept;
friend constexpr bool operator>=(unspecified, weak_ordering v) noexcept;
friend constexpr weak_ordering operator<=>(weak_ordering v, unspecified) noexcept;
friend constexpr weak_ordering operator<=>(unspecified, weak_ordering v) noexcept;
};
// [cmp.strongord], Class strong_ordering
class strong_ordering {
public:
// valid values
static const strong_ordering less;
static const strong_ordering equal;
static const strong_ordering equivalent;
static const strong_ordering greater;
// conversions
constexpr operator partial_ordering() const noexcept;
constexpr operator weak_ordering() const noexcept;
// comparisons
friend constexpr bool operator==(strong_ordering v, unspecified) noexcept;
friend constexpr bool operator==(strong_ordering v, strong_ordering w) noexcept = default;
friend constexpr bool operator< (strong_ordering v, unspecified) noexcept;
friend constexpr bool operator> (strong_ordering v, unspecified) noexcept;
friend constexpr bool operator<=(strong_ordering v, unspecified) noexcept;
friend constexpr bool operator>=(strong_ordering v, unspecified) noexcept;
friend constexpr bool operator< (unspecified, strong_ordering v) noexcept;
friend constexpr bool operator> (unspecified, strong_ordering v) noexcept;
friend constexpr bool operator<=(unspecified, strong_ordering v) noexcept;
friend constexpr bool operator>=(unspecified, strong_ordering v) noexcept;
friend constexpr strong_ordering operator<=>(strong_ordering v, unspecified) noexcept;
friend constexpr strong_ordering operator<=>(unspecified, strong_ordering v) noexcept;
};
}
*/
#include <__config>
#include <type_traits>
#include <array>
#ifndef _LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER
#pragma GCC system_header
#endif
_LIBCPP_BEGIN_NAMESPACE_STD
#if _LIBCPP_STD_VER > 17
// exposition only
enum class _LIBCPP_ENUM_VIS _EqResult : unsigned char {
__zero = 0,
__equal = __zero,
__equiv = __equal,
__nonequal = 1,
__nonequiv = __nonequal
};
enum class _LIBCPP_ENUM_VIS _OrdResult : signed char {
__less = -1,
__greater = 1
};
enum class _LIBCPP_ENUM_VIS _NCmpResult : signed char {
__unordered = -127
};
struct _CmpUnspecifiedParam {
_LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEVAL
_CmpUnspecifiedParam(int _CmpUnspecifiedParam::*) {}
template<typename _Tp, typename = _VSTD::enable_if_t<!_VSTD::is_same_v<_Tp, int>>>
_CmpUnspecifiedParam(_Tp) = delete;
};
class weak_equality {
_LIBCPP_INLINE_VISIBILITY
constexpr explicit weak_equality(_EqResult __val) noexcept : __value_(__val) {}
public:
static const weak_equality equivalent;
static const weak_equality nonequivalent;
_LIBCPP_INLINE_VISIBILITY friend constexpr bool operator==(weak_equality __v, _CmpUnspecifiedParam) noexcept;
_LIBCPP_INLINE_VISIBILITY friend constexpr bool operator==(_CmpUnspecifiedParam, weak_equality __v) noexcept;
_LIBCPP_INLINE_VISIBILITY friend constexpr bool operator!=(weak_equality __v, _CmpUnspecifiedParam) noexcept;
_LIBCPP_INLINE_VISIBILITY friend constexpr bool operator!=(_CmpUnspecifiedParam, weak_equality __v) noexcept;
#ifndef _LIBCPP_HAS_NO_SPACESHIP_OPERATOR
_LIBCPP_INLINE_VISIBILITY friend constexpr weak_equality operator<=>(weak_equality __v, _CmpUnspecifiedParam) noexcept;
_LIBCPP_INLINE_VISIBILITY friend constexpr weak_equality operator<=>(_CmpUnspecifiedParam, weak_equality __v) noexcept;
#endif
private:
_EqResult __value_;
};
_LIBCPP_INLINE_VAR constexpr weak_equality weak_equality::equivalent(_EqResult::__equiv);
_LIBCPP_INLINE_VAR constexpr weak_equality weak_equality::nonequivalent(_EqResult::__nonequiv);
_LIBCPP_INLINE_VISIBILITY
inline constexpr bool operator==(weak_equality __v, _CmpUnspecifiedParam) noexcept {
return __v.__value_ == _EqResult::__zero;
}
_LIBCPP_INLINE_VISIBILITY
inline constexpr bool operator==(_CmpUnspecifiedParam, weak_equality __v) noexcept {
return __v.__value_ == _EqResult::__zero;
}
_LIBCPP_INLINE_VISIBILITY
inline constexpr bool operator!=(weak_equality __v, _CmpUnspecifiedParam) noexcept {
return __v.__value_ != _EqResult::__zero;
}
_LIBCPP_INLINE_VISIBILITY
inline constexpr bool operator!=(_CmpUnspecifiedParam, weak_equality __v) noexcept {
return __v.__value_ != _EqResult::__zero;
}
#ifndef _LIBCPP_HAS_NO_SPACESHIP_OPERATOR
_LIBCPP_INLINE_VISIBILITY
inline constexpr weak_equality operator<=>(weak_equality __v, _CmpUnspecifiedParam) noexcept {
return __v;
}
_LIBCPP_INLINE_VISIBILITY
inline constexpr weak_equality operator<=>(_CmpUnspecifiedParam, weak_equality __v) noexcept {
return __v;
}
#endif
class strong_equality {
_LIBCPP_INLINE_VISIBILITY
explicit constexpr strong_equality(_EqResult __val) noexcept : __value_(__val) {}
public:
static const strong_equality equal;
static const strong_equality nonequal;
static const strong_equality equivalent;
static const strong_equality nonequivalent;
// conversion
_LIBCPP_INLINE_VISIBILITY constexpr operator weak_equality() const noexcept {
return __value_ == _EqResult::__zero ? weak_equality::equivalent
: weak_equality::nonequivalent;
}
// comparisons
_LIBCPP_INLINE_VISIBILITY friend constexpr bool operator==(strong_equality __v, _CmpUnspecifiedParam) noexcept;
_LIBCPP_INLINE_VISIBILITY friend constexpr bool operator!=(strong_equality __v, _CmpUnspecifiedParam) noexcept;
_LIBCPP_INLINE_VISIBILITY friend constexpr bool operator==(_CmpUnspecifiedParam, strong_equality __v) noexcept;
_LIBCPP_INLINE_VISIBILITY friend constexpr bool operator!=(_CmpUnspecifiedParam, strong_equality __v) noexcept;
#ifndef _LIBCPP_HAS_NO_SPACESHIP_OPERATOR
_LIBCPP_INLINE_VISIBILITY friend constexpr strong_equality operator<=>(strong_equality __v, _CmpUnspecifiedParam) noexcept;
_LIBCPP_INLINE_VISIBILITY friend constexpr strong_equality operator<=>(_CmpUnspecifiedParam, strong_equality __v) noexcept;
#endif
private:
_EqResult __value_;
};
_LIBCPP_INLINE_VAR constexpr strong_equality strong_equality::equal(_EqResult::__equal);
_LIBCPP_INLINE_VAR constexpr strong_equality strong_equality::nonequal(_EqResult::__nonequal);
_LIBCPP_INLINE_VAR constexpr strong_equality strong_equality::equivalent(_EqResult::__equiv);
_LIBCPP_INLINE_VAR constexpr strong_equality strong_equality::nonequivalent(_EqResult::__nonequiv);
_LIBCPP_INLINE_VISIBILITY
constexpr bool operator==(strong_equality __v, _CmpUnspecifiedParam) noexcept {
return __v.__value_ == _EqResult::__zero;
}
_LIBCPP_INLINE_VISIBILITY
constexpr bool operator==(_CmpUnspecifiedParam, strong_equality __v) noexcept {
return __v.__value_ == _EqResult::__zero;
}
_LIBCPP_INLINE_VISIBILITY
constexpr bool operator!=(strong_equality __v, _CmpUnspecifiedParam) noexcept {
return __v.__value_ != _EqResult::__zero;
}
_LIBCPP_INLINE_VISIBILITY
constexpr bool operator!=(_CmpUnspecifiedParam, strong_equality __v) noexcept {
return __v.__value_ != _EqResult::__zero;
}
#ifndef _LIBCPP_HAS_NO_SPACESHIP_OPERATOR
_LIBCPP_INLINE_VISIBILITY
constexpr strong_equality operator<=>(strong_equality __v, _CmpUnspecifiedParam) noexcept {
return __v;
}
_LIBCPP_INLINE_VISIBILITY
constexpr strong_equality operator<=>(_CmpUnspecifiedParam, strong_equality __v) noexcept {
return __v;
}
#endif // _LIBCPP_HAS_NO_SPACESHIP_OPERATOR
class partial_ordering {
using _ValueT = signed char;
_LIBCPP_INLINE_VISIBILITY
explicit constexpr partial_ordering(_EqResult __v) noexcept
: __value_(_ValueT(__v)) {}
_LIBCPP_INLINE_VISIBILITY
explicit constexpr partial_ordering(_OrdResult __v) noexcept
: __value_(_ValueT(__v)) {}
_LIBCPP_INLINE_VISIBILITY
explicit constexpr partial_ordering(_NCmpResult __v) noexcept
: __value_(_ValueT(__v)) {}
constexpr bool __is_ordered() const noexcept {
return __value_ != _ValueT(_NCmpResult::__unordered);
}
public:
// valid values
static const partial_ordering less;
static const partial_ordering equivalent;
static const partial_ordering greater;
static const partial_ordering unordered;
// conversion
constexpr operator weak_equality() const noexcept {
return __value_ == 0 ? weak_equality::equivalent : weak_equality::nonequivalent;
}
// comparisons
_LIBCPP_INLINE_VISIBILITY friend constexpr bool operator==(partial_ordering __v, _CmpUnspecifiedParam) noexcept;
_LIBCPP_INLINE_VISIBILITY friend constexpr bool operator!=(partial_ordering __v, _CmpUnspecifiedParam) noexcept;
_LIBCPP_INLINE_VISIBILITY friend constexpr bool operator< (partial_ordering __v, _CmpUnspecifiedParam) noexcept;
_LIBCPP_INLINE_VISIBILITY friend constexpr bool operator<=(partial_ordering __v, _CmpUnspecifiedParam) noexcept;
_LIBCPP_INLINE_VISIBILITY friend constexpr bool operator> (partial_ordering __v, _CmpUnspecifiedParam) noexcept;
_LIBCPP_INLINE_VISIBILITY friend constexpr bool operator>=(partial_ordering __v, _CmpUnspecifiedParam) noexcept;
_LIBCPP_INLINE_VISIBILITY friend constexpr bool operator==(_CmpUnspecifiedParam, partial_ordering __v) noexcept;
_LIBCPP_INLINE_VISIBILITY friend constexpr bool operator!=(_CmpUnspecifiedParam, partial_ordering __v) noexcept;
_LIBCPP_INLINE_VISIBILITY friend constexpr bool operator< (_CmpUnspecifiedParam, partial_ordering __v) noexcept;
_LIBCPP_INLINE_VISIBILITY friend constexpr bool operator<=(_CmpUnspecifiedParam, partial_ordering __v) noexcept;
_LIBCPP_INLINE_VISIBILITY friend constexpr bool operator> (_CmpUnspecifiedParam, partial_ordering __v) noexcept;
_LIBCPP_INLINE_VISIBILITY friend constexpr bool operator>=(_CmpUnspecifiedParam, partial_ordering __v) noexcept;
#ifndef _LIBCPP_HAS_NO_SPACESHIP_OPERATOR
_LIBCPP_INLINE_VISIBILITY friend constexpr bool operator==(partial_ordering, partial_ordering) noexcept = default;
_LIBCPP_INLINE_VISIBILITY friend constexpr partial_ordering operator<=>(partial_ordering __v, _CmpUnspecifiedParam) noexcept;
_LIBCPP_INLINE_VISIBILITY friend constexpr partial_ordering operator<=>(_CmpUnspecifiedParam, partial_ordering __v) noexcept;
#endif
private:
_ValueT __value_;
};
_LIBCPP_INLINE_VAR constexpr partial_ordering partial_ordering::less(_OrdResult::__less);
_LIBCPP_INLINE_VAR constexpr partial_ordering partial_ordering::equivalent(_EqResult::__equiv);
_LIBCPP_INLINE_VAR constexpr partial_ordering partial_ordering::greater(_OrdResult::__greater);
_LIBCPP_INLINE_VAR constexpr partial_ordering partial_ordering::unordered(_NCmpResult ::__unordered);
_LIBCPP_INLINE_VISIBILITY
constexpr bool operator==(partial_ordering __v, _CmpUnspecifiedParam) noexcept {
return __v.__is_ordered() && __v.__value_ == 0;
}
_LIBCPP_INLINE_VISIBILITY
constexpr bool operator< (partial_ordering __v, _CmpUnspecifiedParam) noexcept {
return __v.__is_ordered() && __v.__value_ < 0;
}
_LIBCPP_INLINE_VISIBILITY
constexpr bool operator<=(partial_ordering __v, _CmpUnspecifiedParam) noexcept {
return __v.__is_ordered() && __v.__value_ <= 0;
}
_LIBCPP_INLINE_VISIBILITY
constexpr bool operator> (partial_ordering __v, _CmpUnspecifiedParam) noexcept {
return __v.__is_ordered() && __v.__value_ > 0;
}
_LIBCPP_INLINE_VISIBILITY
constexpr bool operator>=(partial_ordering __v, _CmpUnspecifiedParam) noexcept {
return __v.__is_ordered() && __v.__value_ >= 0;
}
_LIBCPP_INLINE_VISIBILITY
constexpr bool operator==(_CmpUnspecifiedParam, partial_ordering __v) noexcept {
return __v.__is_ordered() && 0 == __v.__value_;
}
_LIBCPP_INLINE_VISIBILITY
constexpr bool operator< (_CmpUnspecifiedParam, partial_ordering __v) noexcept {
return __v.__is_ordered() && 0 < __v.__value_;
}
_LIBCPP_INLINE_VISIBILITY
constexpr bool operator<=(_CmpUnspecifiedParam, partial_ordering __v) noexcept {
return __v.__is_ordered() && 0 <= __v.__value_;
}
_LIBCPP_INLINE_VISIBILITY
constexpr bool operator> (_CmpUnspecifiedParam, partial_ordering __v) noexcept {
return __v.__is_ordered() && 0 > __v.__value_;
}
_LIBCPP_INLINE_VISIBILITY
constexpr bool operator>=(_CmpUnspecifiedParam, partial_ordering __v) noexcept {
return __v.__is_ordered() && 0 >= __v.__value_;
}
_LIBCPP_INLINE_VISIBILITY
constexpr bool operator!=(partial_ordering __v, _CmpUnspecifiedParam) noexcept {
return !__v.__is_ordered() || __v.__value_ != 0;
}
_LIBCPP_INLINE_VISIBILITY
constexpr bool operator!=(_CmpUnspecifiedParam, partial_ordering __v) noexcept {
return !__v.__is_ordered() || __v.__value_ != 0;
}
#ifndef _LIBCPP_HAS_NO_SPACESHIP_OPERATOR
_LIBCPP_INLINE_VISIBILITY
constexpr partial_ordering operator<=>(partial_ordering __v, _CmpUnspecifiedParam) noexcept {
return __v;
}
_LIBCPP_INLINE_VISIBILITY
constexpr partial_ordering operator<=>(_CmpUnspecifiedParam, partial_ordering __v) noexcept {
return __v < 0 ? partial_ordering::greater : (__v > 0 ? partial_ordering::less : __v);
}
#endif // _LIBCPP_HAS_NO_SPACESHIP_OPERATOR
class weak_ordering {
using _ValueT = signed char;
_LIBCPP_INLINE_VISIBILITY
explicit constexpr weak_ordering(_EqResult __v) noexcept : __value_(_ValueT(__v)) {}
_LIBCPP_INLINE_VISIBILITY
explicit constexpr weak_ordering(_OrdResult __v) noexcept : __value_(_ValueT(__v)) {}
public:
static const weak_ordering less;
static const weak_ordering equivalent;
static const weak_ordering greater;
// conversions
_LIBCPP_INLINE_VISIBILITY
constexpr operator weak_equality() const noexcept {
return __value_ == 0 ? weak_equality::equivalent
: weak_equality::nonequivalent;
}
_LIBCPP_INLINE_VISIBILITY
constexpr operator partial_ordering() const noexcept {
return __value_ == 0 ? partial_ordering::equivalent
: (__value_ < 0 ? partial_ordering::less : partial_ordering::greater);
}
// comparisons
_LIBCPP_INLINE_VISIBILITY friend constexpr bool operator==(weak_ordering __v, _CmpUnspecifiedParam) noexcept;
_LIBCPP_INLINE_VISIBILITY friend constexpr bool operator!=(weak_ordering __v, _CmpUnspecifiedParam) noexcept;
_LIBCPP_INLINE_VISIBILITY friend constexpr bool operator< (weak_ordering __v, _CmpUnspecifiedParam) noexcept;
_LIBCPP_INLINE_VISIBILITY friend constexpr bool operator<=(weak_ordering __v, _CmpUnspecifiedParam) noexcept;
_LIBCPP_INLINE_VISIBILITY friend constexpr bool operator> (weak_ordering __v, _CmpUnspecifiedParam) noexcept;
_LIBCPP_INLINE_VISIBILITY friend constexpr bool operator>=(weak_ordering __v, _CmpUnspecifiedParam) noexcept;
_LIBCPP_INLINE_VISIBILITY friend constexpr bool operator==(_CmpUnspecifiedParam, weak_ordering __v) noexcept;
_LIBCPP_INLINE_VISIBILITY friend constexpr bool operator!=(_CmpUnspecifiedParam, weak_ordering __v) noexcept;
_LIBCPP_INLINE_VISIBILITY friend constexpr bool operator< (_CmpUnspecifiedParam, weak_ordering __v) noexcept;
_LIBCPP_INLINE_VISIBILITY friend constexpr bool operator<=(_CmpUnspecifiedParam, weak_ordering __v) noexcept;
_LIBCPP_INLINE_VISIBILITY friend constexpr bool operator> (_CmpUnspecifiedParam, weak_ordering __v) noexcept;
_LIBCPP_INLINE_VISIBILITY friend constexpr bool operator>=(_CmpUnspecifiedParam, weak_ordering __v) noexcept;
#ifndef _LIBCPP_HAS_NO_SPACESHIP_OPERATOR
_LIBCPP_INLINE_VISIBILITY friend constexpr bool operator==(weak_ordering, weak_ordering) noexcept = default;
_LIBCPP_INLINE_VISIBILITY friend constexpr weak_ordering operator<=>(weak_ordering __v, _CmpUnspecifiedParam) noexcept;
_LIBCPP_INLINE_VISIBILITY friend constexpr weak_ordering operator<=>(_CmpUnspecifiedParam, weak_ordering __v) noexcept;
#endif
private:
_ValueT __value_;
};
_LIBCPP_INLINE_VAR constexpr weak_ordering weak_ordering::less(_OrdResult::__less);
_LIBCPP_INLINE_VAR constexpr weak_ordering weak_ordering::equivalent(_EqResult::__equiv);
_LIBCPP_INLINE_VAR constexpr weak_ordering weak_ordering::greater(_OrdResult::__greater);
_LIBCPP_INLINE_VISIBILITY
constexpr bool operator==(weak_ordering __v, _CmpUnspecifiedParam) noexcept {
return __v.__value_ == 0;
}
_LIBCPP_INLINE_VISIBILITY
constexpr bool operator!=(weak_ordering __v, _CmpUnspecifiedParam) noexcept {
return __v.__value_ != 0;
}
_LIBCPP_INLINE_VISIBILITY
constexpr bool operator< (weak_ordering __v, _CmpUnspecifiedParam) noexcept {
return __v.__value_ < 0;
}
_LIBCPP_INLINE_VISIBILITY
constexpr bool operator<=(weak_ordering __v, _CmpUnspecifiedParam) noexcept {
return __v.__value_ <= 0;
}
_LIBCPP_INLINE_VISIBILITY
constexpr bool operator> (weak_ordering __v, _CmpUnspecifiedParam) noexcept {
return __v.__value_ > 0;
}
_LIBCPP_INLINE_VISIBILITY
constexpr bool operator>=(weak_ordering __v, _CmpUnspecifiedParam) noexcept {
return __v.__value_ >= 0;
}
_LIBCPP_INLINE_VISIBILITY
constexpr bool operator==(_CmpUnspecifiedParam, weak_ordering __v) noexcept {
return 0 == __v.__value_;
}
_LIBCPP_INLINE_VISIBILITY
constexpr bool operator!=(_CmpUnspecifiedParam, weak_ordering __v) noexcept {
return 0 != __v.__value_;
}
_LIBCPP_INLINE_VISIBILITY
constexpr bool operator< (_CmpUnspecifiedParam, weak_ordering __v) noexcept {
return 0 < __v.__value_;
}
_LIBCPP_INLINE_VISIBILITY
constexpr bool operator<=(_CmpUnspecifiedParam, weak_ordering __v) noexcept {
return 0 <= __v.__value_;
}
_LIBCPP_INLINE_VISIBILITY
constexpr bool operator> (_CmpUnspecifiedParam, weak_ordering __v) noexcept {
return 0 > __v.__value_;
}
_LIBCPP_INLINE_VISIBILITY
constexpr bool operator>=(_CmpUnspecifiedParam, weak_ordering __v) noexcept {
return 0 >= __v.__value_;
}
#ifndef _LIBCPP_HAS_NO_SPACESHIP_OPERATOR
_LIBCPP_INLINE_VISIBILITY
constexpr weak_ordering operator<=>(weak_ordering __v, _CmpUnspecifiedParam) noexcept {
return __v;
}
_LIBCPP_INLINE_VISIBILITY
constexpr weak_ordering operator<=>(_CmpUnspecifiedParam, weak_ordering __v) noexcept {
return __v < 0 ? weak_ordering::greater : (__v > 0 ? weak_ordering::less : __v);
}
#endif // _LIBCPP_HAS_NO_SPACESHIP_OPERATOR
class strong_ordering {
using _ValueT = signed char;
_LIBCPP_INLINE_VISIBILITY
explicit constexpr strong_ordering(_EqResult __v) noexcept : __value_(_ValueT(__v)) {}
_LIBCPP_INLINE_VISIBILITY
explicit constexpr strong_ordering(_OrdResult __v) noexcept : __value_(_ValueT(__v)) {}
public:
static const strong_ordering less;
static const strong_ordering equal;
static const strong_ordering equivalent;
static const strong_ordering greater;
// conversions
_LIBCPP_INLINE_VISIBILITY
constexpr operator weak_equality() const noexcept {
return __value_ == 0 ? weak_equality::equivalent
: weak_equality::nonequivalent;
}
_LIBCPP_INLINE_VISIBILITY
constexpr operator strong_equality() const noexcept {
return __value_ == 0 ? strong_equality::equal
: strong_equality::nonequal;
}
_LIBCPP_INLINE_VISIBILITY
constexpr operator partial_ordering() const noexcept {
return __value_ == 0 ? partial_ordering::equivalent
: (__value_ < 0 ? partial_ordering::less : partial_ordering::greater);
}
_LIBCPP_INLINE_VISIBILITY
constexpr operator weak_ordering() const noexcept {
return __value_ == 0 ? weak_ordering::equivalent
: (__value_ < 0 ? weak_ordering::less : weak_ordering::greater);
}
// comparisons
_LIBCPP_INLINE_VISIBILITY friend constexpr bool operator==(strong_ordering __v, _CmpUnspecifiedParam) noexcept;
_LIBCPP_INLINE_VISIBILITY friend constexpr bool operator!=(strong_ordering __v, _CmpUnspecifiedParam) noexcept;
_LIBCPP_INLINE_VISIBILITY friend constexpr bool operator< (strong_ordering __v, _CmpUnspecifiedParam) noexcept;
_LIBCPP_INLINE_VISIBILITY friend constexpr bool operator<=(strong_ordering __v, _CmpUnspecifiedParam) noexcept;
_LIBCPP_INLINE_VISIBILITY friend constexpr bool operator> (strong_ordering __v, _CmpUnspecifiedParam) noexcept;
_LIBCPP_INLINE_VISIBILITY friend constexpr bool operator>=(strong_ordering __v, _CmpUnspecifiedParam) noexcept;
_LIBCPP_INLINE_VISIBILITY friend constexpr bool operator==(_CmpUnspecifiedParam, strong_ordering __v) noexcept;
_LIBCPP_INLINE_VISIBILITY friend constexpr bool operator!=(_CmpUnspecifiedParam, strong_ordering __v) noexcept;
_LIBCPP_INLINE_VISIBILITY friend constexpr bool operator< (_CmpUnspecifiedParam, strong_ordering __v) noexcept;
_LIBCPP_INLINE_VISIBILITY friend constexpr bool operator<=(_CmpUnspecifiedParam, strong_ordering __v) noexcept;
_LIBCPP_INLINE_VISIBILITY friend constexpr bool operator> (_CmpUnspecifiedParam, strong_ordering __v) noexcept;
_LIBCPP_INLINE_VISIBILITY friend constexpr bool operator>=(_CmpUnspecifiedParam, strong_ordering __v) noexcept;
#ifndef _LIBCPP_HAS_NO_SPACESHIP_OPERATOR
_LIBCPP_INLINE_VISIBILITY friend constexpr bool operator==(strong_ordering, strong_ordering) noexcept = default;
_LIBCPP_INLINE_VISIBILITY friend constexpr strong_ordering operator<=>(strong_ordering __v, _CmpUnspecifiedParam) noexcept;
_LIBCPP_INLINE_VISIBILITY friend constexpr strong_ordering operator<=>(_CmpUnspecifiedParam, strong_ordering __v) noexcept;
#endif
private:
_ValueT __value_;
};
_LIBCPP_INLINE_VAR constexpr strong_ordering strong_ordering::less(_OrdResult::__less);
_LIBCPP_INLINE_VAR constexpr strong_ordering strong_ordering::equal(_EqResult::__equal);
_LIBCPP_INLINE_VAR constexpr strong_ordering strong_ordering::equivalent(_EqResult::__equiv);
_LIBCPP_INLINE_VAR constexpr strong_ordering strong_ordering::greater(_OrdResult::__greater);
_LIBCPP_INLINE_VISIBILITY
constexpr bool operator==(strong_ordering __v, _CmpUnspecifiedParam) noexcept {
return __v.__value_ == 0;
}
_LIBCPP_INLINE_VISIBILITY
constexpr bool operator!=(strong_ordering __v, _CmpUnspecifiedParam) noexcept {
return __v.__value_ != 0;
}
_LIBCPP_INLINE_VISIBILITY
constexpr bool operator< (strong_ordering __v, _CmpUnspecifiedParam) noexcept {
return __v.__value_ < 0;
}
_LIBCPP_INLINE_VISIBILITY
constexpr bool operator<=(strong_ordering __v, _CmpUnspecifiedParam) noexcept {
return __v.__value_ <= 0;
}
_LIBCPP_INLINE_VISIBILITY
constexpr bool operator> (strong_ordering __v, _CmpUnspecifiedParam) noexcept {
return __v.__value_ > 0;
}
_LIBCPP_INLINE_VISIBILITY
constexpr bool operator>=(strong_ordering __v, _CmpUnspecifiedParam) noexcept {
return __v.__value_ >= 0;
}
_LIBCPP_INLINE_VISIBILITY
constexpr bool operator==(_CmpUnspecifiedParam, strong_ordering __v) noexcept {
return 0 == __v.__value_;
}
_LIBCPP_INLINE_VISIBILITY
constexpr bool operator!=(_CmpUnspecifiedParam, strong_ordering __v) noexcept {
return 0 != __v.__value_;
}
_LIBCPP_INLINE_VISIBILITY
constexpr bool operator< (_CmpUnspecifiedParam, strong_ordering __v) noexcept {
return 0 < __v.__value_;
}
_LIBCPP_INLINE_VISIBILITY
constexpr bool operator<=(_CmpUnspecifiedParam, strong_ordering __v) noexcept {
return 0 <= __v.__value_;
}
_LIBCPP_INLINE_VISIBILITY
constexpr bool operator> (_CmpUnspecifiedParam, strong_ordering __v) noexcept {
return 0 > __v.__value_;
}
_LIBCPP_INLINE_VISIBILITY
constexpr bool operator>=(_CmpUnspecifiedParam, strong_ordering __v) noexcept {
return 0 >= __v.__value_;
}
#ifndef _LIBCPP_HAS_NO_SPACESHIP_OPERATOR
_LIBCPP_INLINE_VISIBILITY
constexpr strong_ordering operator<=>(strong_ordering __v, _CmpUnspecifiedParam) noexcept {
return __v;
}
_LIBCPP_INLINE_VISIBILITY
constexpr strong_ordering operator<=>(_CmpUnspecifiedParam, strong_ordering __v) noexcept {
return __v < 0 ? strong_ordering::greater : (__v > 0 ? strong_ordering::less : __v);
}
#endif // _LIBCPP_HAS_NO_SPACESHIP_OPERATOR
// named comparison functions
_LIBCPP_INLINE_VISIBILITY
constexpr bool is_eq(weak_equality __cmp) noexcept { return __cmp == 0; }
_LIBCPP_INLINE_VISIBILITY
constexpr bool is_neq(weak_equality __cmp) noexcept { return __cmp != 0; }
_LIBCPP_INLINE_VISIBILITY
constexpr bool is_lt(partial_ordering __cmp) noexcept { return __cmp < 0; }
_LIBCPP_INLINE_VISIBILITY
constexpr bool is_lteq(partial_ordering __cmp) noexcept { return __cmp <= 0; }
_LIBCPP_INLINE_VISIBILITY
constexpr bool is_gt(partial_ordering __cmp) noexcept { return __cmp > 0; }
_LIBCPP_INLINE_VISIBILITY
constexpr bool is_gteq(partial_ordering __cmp) noexcept { return __cmp >= 0; }
namespace __comp_detail {
enum _ClassifyCompCategory : unsigned{
_None,
_WeakEq,
_StrongEq,
_PartialOrd,
_WeakOrd,
_StrongOrd,
_CCC_Size
};
template <class _Tp>
_LIBCPP_INLINE_VISIBILITY
constexpr _ClassifyCompCategory __type_to_enum() noexcept {
if (is_same_v<_Tp, weak_equality>)
return _WeakEq;
if (is_same_v<_Tp, strong_equality>)
return _StrongEq;
if (is_same_v<_Tp, partial_ordering>)
return _PartialOrd;
if (is_same_v<_Tp, weak_ordering>)
return _WeakOrd;
if (is_same_v<_Tp, strong_ordering>)
return _StrongOrd;
return _None;
}
template <size_t _Size>
constexpr _ClassifyCompCategory
__compute_comp_type(std::array<_ClassifyCompCategory, _Size> __types) {
std::array<int, _CCC_Size> __seen = {};
for (auto __type : __types)
++__seen[__type];
if (__seen[_None])
return _None;
if (__seen[_WeakEq])
return _WeakEq;
if (__seen[_StrongEq] && (__seen[_PartialOrd] || __seen[_WeakOrd]))
return _WeakEq;
if (__seen[_StrongEq])
return _StrongEq;
if (__seen[_PartialOrd])
return _PartialOrd;
if (__seen[_WeakOrd])
return _WeakOrd;
return _StrongOrd;
}
template <class ..._Ts>
constexpr auto __get_comp_type() {
using _CCC = _ClassifyCompCategory;
constexpr array<_CCC, sizeof...(_Ts)> __type_kinds{{__comp_detail::__type_to_enum<_Ts>()...}};
constexpr _CCC _Cat = sizeof...(_Ts) == 0 ? _StrongOrd
: __compute_comp_type(__type_kinds);
if constexpr (_Cat == _None)
return void();
else if constexpr (_Cat == _WeakEq)
return weak_equality::equivalent;
else if constexpr (_Cat == _StrongEq)
return strong_equality::equivalent;
else if constexpr (_Cat == _PartialOrd)
return partial_ordering::equivalent;
else if constexpr (_Cat == _WeakOrd)
return weak_ordering::equivalent;
else if constexpr (_Cat == _StrongOrd)
return strong_ordering::equivalent;
else
static_assert(_Cat != _Cat, "unhandled case");
}
} // namespace __comp_detail
// [cmp.common], common comparison category type
template<class... _Ts>
struct _LIBCPP_TEMPLATE_VIS common_comparison_category {
using type = decltype(__comp_detail::__get_comp_type<_Ts...>());
};
template<class... _Ts>
using common_comparison_category_t = typename common_comparison_category<_Ts...>::type;
// [cmp.alg], comparison algorithms
// TODO: unimplemented
template<class _Tp> constexpr strong_ordering strong_order(const _Tp& __lhs, const _Tp& __rhs);
template<class _Tp> constexpr weak_ordering weak_order(const _Tp& __lhs, const _Tp& __rhs);
template<class _Tp> constexpr partial_ordering partial_order(const _Tp& __lhs, const _Tp& __rhs);
template<class _Tp> constexpr strong_equality strong_equal(const _Tp& __lhs, const _Tp& __rhs);
template<class _Tp> constexpr weak_equality weak_equal(const _Tp& __lhs, const _Tp& __rhs);
#endif // _LIBCPP_STD_VER > 17
_LIBCPP_END_NAMESPACE_STD
#endif // _LIBCPP_COMPARE