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Everywhere: Remove redundant inequality comparison operators

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C++20 can automatically synthesize `operator!=` from `operator==`, so
there is no point in writing such functions by hand if all they do is
call through to `operator==`.

This fixes a compile error with compilers that implement P2468 (Clang
16 currently). This paper restores the C++17 behavior that if both
`T::operator==(U)` and `T::operator!=(U)` exist, `U == T` won't be
rewritten in reverse to call `T::operator==(U)`. Removing `!=` operators
makes the rewriting possible again.
See https://reviews.llvm.org/D134529#3853062
This commit is contained in:
Daniel Bertalan 2022-10-21 15:53:20 +02:00 • committed by Andrew Kaster
parent 4e406b0730
commit 4296425bd8
40 changed files with 1 additions and 180 deletions
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9
AK/RefPtr.h
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@ -260,29 +260,20 @@ public:
ALWAYS_INLINE operator bool() { return !is_null(); }
bool operator==(std::nullptr_t) const { return is_null(); }
bool operator!=(std::nullptr_t) const { return !is_null(); }
bool operator==(RefPtr const& other) const { return as_ptr() == other.as_ptr(); }
bool operator!=(RefPtr const& other) const { return as_ptr() != other.as_ptr(); }
bool operator==(RefPtr& other) { return as_ptr() == other.as_ptr(); }
bool operator!=(RefPtr& other) { return as_ptr() != other.as_ptr(); }
template<typename U>
bool operator==(NonnullRefPtr<U> const& other) const { return as_ptr() == other.m_ptr; }
template<typename U>
bool operator!=(NonnullRefPtr<U> const& other) const { return as_ptr() != other.m_ptr; }
template<typename U>
bool operator==(NonnullRefPtr<U>& other) { return as_ptr() == other.m_ptr; }
template<typename U>
bool operator!=(NonnullRefPtr<U>& other) { return as_ptr() != other.m_ptr; }
bool operator==(T const* other) const { return as_ptr() == other; }
bool operator!=(T const* other) const { return as_ptr() != other; }
bool operator==(T* other) { return as_ptr() == other; }
bool operator!=(T* other) { return as_ptr() != other; }
ALWAYS_INLINE bool is_null() const { return !m_ptr; }