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mirror-llvm-project/libcxx/include/__optional/comparison.h
William Tran-Viet 7ded638ea3
[libc++] Granularize <optional> (#206644) 
Certain headers require `optional<T&>`, so it may be beneficial to split
out `optional<T>` and `optional<T&>`. This can allow consumers to only
bring in the `optional` flavour it needs..

- Parcel out the respective pieces into their own header.
- Certain sources rely on transitive includes brought in by
`<optional>`, so they're kept there for now, and only tests have been
fixed.

---------

Co-authored-by: Louis Dionne <ldionne.2@gmail.com>
2026-07-30 11:12:15 +08:00

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//===----------------------------------------------------------------------===//
//
// 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___OPTIONAL_COMPARISON_H
#define _LIBCPP___OPTIONAL_COMPARISON_H
#include <__compare/compare_three_way_result.h>
#include <__compare/ordering.h>
#include <__compare/three_way_comparable.h>
#include <__config>
#include <__optional/nullopt_t.h>
#include <__type_traits/enable_if.h>
#include <__type_traits/is_constructible.h>
#include <__type_traits/is_core_convertible.h>
#include <__type_traits/is_swappable.h>
#include <__utility/declval.h>
#include <__fwd/optional.h>
#if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
# pragma GCC system_header
#endif
_LIBCPP_PUSH_MACROS
#include <__undef_macros>
#if _LIBCPP_STD_VER >= 17
_LIBCPP_BEGIN_NAMESPACE_STD
// [optional.relops] Relational operators
template <
class _Tp,
class _Up,
enable_if_t<__is_core_convertible_v<decltype(std::declval<const _Tp&>() == std::declval<const _Up&>()), bool>,
int> = 0>
_LIBCPP_HIDE_FROM_ABI constexpr bool operator==(const optional<_Tp>& __x, const optional<_Up>& __y) {
if (static_cast<bool>(__x) != static_cast<bool>(__y))
return false;
if (!static_cast<bool>(__x))
return true;
return *__x == *__y;
}
template <
class _Tp,
class _Up,
enable_if_t<__is_core_convertible_v<decltype(std::declval<const _Tp&>() != std::declval<const _Up&>()), bool>,
int> = 0>
_LIBCPP_HIDE_FROM_ABI constexpr bool operator!=(const optional<_Tp>& __x, const optional<_Up>& __y) {
if (static_cast<bool>(__x) != static_cast<bool>(__y))
return true;
if (!static_cast<bool>(__x))
return false;
return *__x != *__y;
}
template < class _Tp,
class _Up,
enable_if_t<__is_core_convertible_v<decltype(std::declval<const _Tp&>() < std::declval<const _Up&>()), bool>,
int> = 0>
_LIBCPP_HIDE_FROM_ABI constexpr bool operator<(const optional<_Tp>& __x, const optional<_Up>& __y) {
if (!static_cast<bool>(__y))
return false;
if (!static_cast<bool>(__x))
return true;
return *__x < *__y;
}
template < class _Tp,
class _Up,
enable_if_t<__is_core_convertible_v<decltype(std::declval<const _Tp&>() > std::declval<const _Up&>()), bool>,
int> = 0>
_LIBCPP_HIDE_FROM_ABI constexpr bool operator>(const optional<_Tp>& __x, const optional<_Up>& __y) {
if (!static_cast<bool>(__x))
return false;
if (!static_cast<bool>(__y))
return true;
return *__x > *__y;
}
template <
class _Tp,
class _Up,
enable_if_t<__is_core_convertible_v<decltype(std::declval<const _Tp&>() <= std::declval<const _Up&>()), bool>,
int> = 0>
_LIBCPP_HIDE_FROM_ABI constexpr bool operator<=(const optional<_Tp>& __x, const optional<_Up>& __y) {
if (!static_cast<bool>(__x))
return true;
if (!static_cast<bool>(__y))
return false;
return *__x <= *__y;
}
template <
class _Tp,
class _Up,
enable_if_t<__is_core_convertible_v<decltype(std::declval<const _Tp&>() >= std::declval<const _Up&>()), bool>,
int> = 0>
_LIBCPP_HIDE_FROM_ABI constexpr bool operator>=(const optional<_Tp>& __x, const optional<_Up>& __y) {
if (!static_cast<bool>(__y))
return true;
if (!static_cast<bool>(__x))
return false;
return *__x >= *__y;
}
# if _LIBCPP_STD_VER >= 20
template <class _Tp, three_way_comparable_with<_Tp> _Up>
_LIBCPP_HIDE_FROM_ABI constexpr compare_three_way_result_t<_Tp, _Up>
operator<=>(const optional<_Tp>& __x, const optional<_Up>& __y) {
if (__x && __y)
return *__x <=> *__y;
return __x.has_value() <=> __y.has_value();
}
# endif // _LIBCPP_STD_VER >= 20
// [optional.nullops] Comparison with nullopt
template <class _Tp>
_LIBCPP_HIDE_FROM_ABI constexpr bool operator==(const optional<_Tp>& __x, nullopt_t) noexcept {
return !static_cast<bool>(__x);
}
# if _LIBCPP_STD_VER <= 17
template <class _Tp>
_LIBCPP_HIDE_FROM_ABI constexpr bool operator==(nullopt_t, const optional<_Tp>& __x) noexcept {
return !static_cast<bool>(__x);
}
template <class _Tp>
_LIBCPP_HIDE_FROM_ABI constexpr bool operator!=(const optional<_Tp>& __x, nullopt_t) noexcept {
return static_cast<bool>(__x);
}
template <class _Tp>
_LIBCPP_HIDE_FROM_ABI constexpr bool operator!=(nullopt_t, const optional<_Tp>& __x) noexcept {
return static_cast<bool>(__x);
}
template <class _Tp>
_LIBCPP_HIDE_FROM_ABI constexpr bool operator<(const optional<_Tp>&, nullopt_t) noexcept {
return false;
}
template <class _Tp>
_LIBCPP_HIDE_FROM_ABI constexpr bool operator<(nullopt_t, const optional<_Tp>& __x) noexcept {
return static_cast<bool>(__x);
}
template <class _Tp>
_LIBCPP_HIDE_FROM_ABI constexpr bool operator<=(const optional<_Tp>& __x, nullopt_t) noexcept {
return !static_cast<bool>(__x);
}
template <class _Tp>
_LIBCPP_HIDE_FROM_ABI constexpr bool operator<=(nullopt_t, const optional<_Tp>&) noexcept {
return true;
}
template <class _Tp>
_LIBCPP_HIDE_FROM_ABI constexpr bool operator>(const optional<_Tp>& __x, nullopt_t) noexcept {
return static_cast<bool>(__x);
}
template <class _Tp>
_LIBCPP_HIDE_FROM_ABI constexpr bool operator>(nullopt_t, const optional<_Tp>&) noexcept {
return false;
}
template <class _Tp>
_LIBCPP_HIDE_FROM_ABI constexpr bool operator>=(const optional<_Tp>&, nullopt_t) noexcept {
return true;
}
template <class _Tp>
_LIBCPP_HIDE_FROM_ABI constexpr bool operator>=(nullopt_t, const optional<_Tp>& __x) noexcept {
return !static_cast<bool>(__x);
}
# else // _LIBCPP_STD_VER <= 17
template <class _Tp>
_LIBCPP_HIDE_FROM_ABI constexpr strong_ordering operator<=>(const optional<_Tp>& __x, nullopt_t) noexcept {
return __x.has_value() <=> false;
}
# endif // _LIBCPP_STD_VER <= 17
// [optional.comp.with.t] Comparison with T
template <
class _Tp,
class _Up,
enable_if_t<__is_core_convertible_v<decltype(std::declval<const _Tp&>() == std::declval<const _Up&>()), bool>,
int> = 0>
_LIBCPP_HIDE_FROM_ABI constexpr bool operator==(const optional<_Tp>& __x, const _Up& __v) {
if (__x.has_value())
return *__x == __v;
return false;
}
template <
class _Tp,
class _Up,
enable_if_t<__is_core_convertible_v<decltype(std::declval<const _Tp&>() == std::declval<const _Up&>()), bool>,
int> = 0>
_LIBCPP_HIDE_FROM_ABI constexpr bool operator==(const _Tp& __v, const optional<_Up>& __x) {
if (__x.has_value())
return __v == *__x;
return false;
}
template <
class _Tp,
class _Up,
enable_if_t<__is_core_convertible_v<decltype(std::declval<const _Tp&>() != std::declval<const _Up&>()), bool>,
int> = 0>
_LIBCPP_HIDE_FROM_ABI constexpr bool operator!=(const optional<_Tp>& __x, const _Up& __v) {
if (__x.has_value())
return *__x != __v;
return true;
}
template <
class _Tp,
class _Up,
enable_if_t<__is_core_convertible_v<decltype(std::declval<const _Tp&>() != std::declval<const _Up&>()), bool>,
int> = 0>
_LIBCPP_HIDE_FROM_ABI constexpr bool operator!=(const _Tp& __v, const optional<_Up>& __x) {
if (__x.has_value())
return __v != *__x;
return true;
}
template < class _Tp,
class _Up,
enable_if_t<__is_core_convertible_v<decltype(std::declval<const _Tp&>() < std::declval<const _Up&>()), bool>,
int> = 0>
_LIBCPP_HIDE_FROM_ABI constexpr bool operator<(const optional<_Tp>& __x, const _Up& __v) {
if (__x.has_value())
return *__x < __v;
return true;
}
template < class _Tp,
class _Up,
enable_if_t<__is_core_convertible_v<decltype(std::declval<const _Tp&>() < std::declval<const _Up&>()), bool>,
int> = 0>
_LIBCPP_HIDE_FROM_ABI constexpr bool operator<(const _Tp& __v, const optional<_Up>& __x) {
if (__x.has_value())
return __v < *__x;
return false;
}
template <
class _Tp,
class _Up,
enable_if_t<__is_core_convertible_v<decltype(std::declval<const _Tp&>() <= std::declval<const _Up&>()), bool>,
int> = 0>
_LIBCPP_HIDE_FROM_ABI constexpr bool operator<=(const optional<_Tp>& __x, const _Up& __v) {
if (__x.has_value())
return *__x <= __v;
return true;
}
template <
class _Tp,
class _Up,
enable_if_t<__is_core_convertible_v<decltype(std::declval<const _Tp&>() <= std::declval<const _Up&>()), bool>,
int> = 0>
_LIBCPP_HIDE_FROM_ABI constexpr bool operator<=(const _Tp& __v, const optional<_Up>& __x) {
if (__x.has_value())
return __v <= *__x;
return false;
}
template < class _Tp,
class _Up,
enable_if_t<__is_core_convertible_v<decltype(std::declval<const _Tp&>() > std::declval<const _Up&>()), bool>,
int> = 0>
_LIBCPP_HIDE_FROM_ABI constexpr bool operator>(const optional<_Tp>& __x, const _Up& __v) {
if (__x.has_value())
return *__x > __v;
return false;
}
template < class _Tp,
class _Up,
enable_if_t<__is_core_convertible_v<decltype(std::declval<const _Tp&>() > std::declval<const _Up&>()), bool>,
int> = 0>
_LIBCPP_HIDE_FROM_ABI constexpr bool operator>(const _Tp& __v, const optional<_Up>& __x) {
if (__x.has_value())
return __v > *__x;
return true;
}
template <
class _Tp,
class _Up,
enable_if_t<__is_core_convertible_v<decltype(std::declval<const _Tp&>() >= std::declval<const _Up&>()), bool>,
int> = 0>
_LIBCPP_HIDE_FROM_ABI constexpr bool operator>=(const optional<_Tp>& __x, const _Up& __v) {
if (__x.has_value())
return *__x >= __v;
return false;
}
template <
class _Tp,
class _Up,
enable_if_t<__is_core_convertible_v<decltype(std::declval<const _Tp&>() >= std::declval<const _Up&>()), bool>,
int> = 0>
_LIBCPP_HIDE_FROM_ABI constexpr bool operator>=(const _Tp& __v, const optional<_Up>& __x) {
if (__x.has_value())
return __v >= *__x;
return true;
}
# if _LIBCPP_STD_VER >= 20
template <class _Tp>
concept __is_derived_from_optional = requires(const _Tp& __t) { []<class _Up>(const optional<_Up>&) {}(__t); };
template <class _Tp, class _Up>
requires(!__is_derived_from_optional<_Up>) && three_way_comparable_with<_Tp, _Up>
_LIBCPP_HIDE_FROM_ABI constexpr compare_three_way_result_t<_Tp, _Up>
operator<=>(const optional<_Tp>& __x, const _Up& __v) {
return __x.has_value() ? *__x <=> __v : strong_ordering::less;
}
# endif // _LIBCPP_STD_VER >= 20
_LIBCPP_END_NAMESPACE_STD
#endif // _LIBCPP_STD_VER >= 17
_LIBCPP_POP_MACROS
#endif // _LIBCPP___OPTIONAL_COMPARISON_H
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