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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
Notes: sideshowbarker 2024-07-17 04:44:02 +09:00 
Author: https://github.com/BertalanD
Commit: https://github.com/SerenityOS/serenity/commit/4296425bd8
Pull-request: https://github.com/SerenityOS/serenity/pull/15765
Reviewed-by: https://github.com/ADKaster ✅
40 changed files with 1 additions and 180 deletions
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2
AK/ByteBuffer.h
View File

@ -102,8 +102,6 @@ public:
return !__builtin_memcmp(data(), other.data(), size());
}
bool operator!=(ByteBuffer const& other) const { return !(*this == other); }
[[nodiscard]] u8& operator[](size_t i)
{
VERIFY(i < m_size);

6
AK/Complex.h
View File

@ -211,12 +211,6 @@ public:
return (this->real() == a.real()) && (this->imag() == a.imag());
}
template<AK::Concepts::Arithmetic U>
constexpr bool operator!=(Complex<U> const& a) const
{
return !(*this == a);
}
constexpr Complex<T> operator+()
{
return *this;

4
AK/DistinctNumeric.h
View File

@ -67,10 +67,6 @@ public:
{
return this->m_value == other.m_value;
}
constexpr bool operator!=(Self const& other) const
{
return this->m_value != other.m_value;
}
// Only implemented when `Incr` is true:
constexpr Self& operator++()

4
AK/FlyString.h
View File

@ -53,16 +53,12 @@ public:
bool is_null() const { return !m_impl; }
bool operator==(FlyString const& other) const { return m_impl == other.m_impl; }
bool operator!=(FlyString const& other) const { return m_impl != other.m_impl; }
bool operator==(String const&) const;
bool operator!=(String const& string) const { return !(*this == string); }
bool operator==(StringView) const;
bool operator!=(StringView string) const { return !(*this == string); }
bool operator==(char const*) const;
bool operator!=(char const* string) const { return !(*this == string); }
StringImpl const* impl() const { return m_impl; }
char const* characters() const { return m_impl ? m_impl->characters() : nullptr; }

3
AK/IntrusiveList.h
View File

@ -80,7 +80,6 @@ public:
T& operator*() { return *m_value; }
auto operator->() { return m_value; }
bool operator==(Iterator const& other) const { return other.m_value == m_value; }
bool operator!=(Iterator const& other) const { return !(*this == other); }
Iterator& operator++()
{
m_value = IntrusiveList<T, Container, member>::next(m_value);
@ -108,7 +107,6 @@ public:
T& operator*() { return *m_value; }
auto operator->() { return m_value; }
bool operator==(ReverseIterator const& other) const { return other.m_value == m_value; }
bool operator!=(ReverseIterator const& other) const { return !(*this == other); }
ReverseIterator& operator++()
{
m_value = IntrusiveList<T, Container, member>::prev(m_value);
@ -134,7 +132,6 @@ public:
T const& operator*() const { return *m_value; }
auto operator->() const { return m_value; }
bool operator==(ConstIterator const& other) const { return other.m_value == m_value; }
bool operator!=(ConstIterator const& other) const { return !(*this == other); }
ConstIterator& operator++()
{
m_value = IntrusiveList<T, Container, member>::next(m_value);

4
AK/JsonPath.h
View File

@ -75,10 +75,6 @@ public:
}
return false;
}
bool operator!=(JsonPathElement const& other) const
{
return !(*this == other);
}
private:
Kind m_kind;

2
AK/NonnullRefPtr.h
View File

@ -216,10 +216,8 @@ public:
}
bool operator==(NonnullRefPtr const& other) const { return m_ptr == other.m_ptr; }
bool operator!=(NonnullRefPtr const& other) const { return m_ptr != other.m_ptr; }
bool operator==(NonnullRefPtr& other) { return m_ptr == other.m_ptr; }
bool operator!=(NonnullRefPtr& other) { return m_ptr != other.m_ptr; }
// clang-format off
private:

9
AK/RefPtr.h
View File

@ -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; }

4
AK/String.h
View File

@ -203,13 +203,10 @@ public:
[[nodiscard]] bool ends_with(char) const;
bool operator==(String const&) const;
bool operator!=(String const& other) const { return !(*this == other); }
bool operator==(StringView) const;
bool operator!=(StringView other) const { return !(*this == other); }
bool operator==(FlyString const&) const;
bool operator!=(FlyString const& other) const { return !(*this == other); }
bool operator<(String const&) const;
bool operator<(char const*) const;
@ -222,7 +219,6 @@ public:
bool operator<=(char const* other) const { return !(*this > other); }
bool operator==(char const* cstring) const;
bool operator!=(char const* cstring) const { return !(*this == cstring); }
[[nodiscard]] String isolated_copy() const;

4
AK/StringUtils.h
View File

@ -62,10 +62,6 @@ struct MaskSpan {
{
return start == other.start && length == other.length;
}
bool operator!=(MaskSpan const& other) const
{
return !(*this == other);
}
};
namespace StringUtils {

5
AK/StringView.h
View File

@ -245,11 +245,6 @@ public:
return m_length == 1 && *m_characters == c;
}
constexpr bool operator!=(char const* cstring) const
{
return !(*this == cstring);
}
#ifndef KERNEL
bool operator==(String const&) const;
#endif

1
AK/Time.h
View File

@ -223,7 +223,6 @@ public:
[[nodiscard]] bool is_negative() const { return m_seconds < 0; }
bool operator==(Time const& other) const { return this->m_seconds == other.m_seconds && this->m_nanoseconds == other.m_nanoseconds; }
bool operator!=(Time const& other) const { return !(*this == other); }
Time operator+(Time const& other) const;
Time& operator+=(Time const& other);
Time operator-(Time const& other) const;

9
AK/UUID.cpp
View File

@ -113,15 +113,6 @@ String UUID::to_string() const
}
#endif
bool UUID::operator==(const UUID& other) const
{
for (size_t index = 0; index < 16; index++) {
if (m_uuid_buffer[index] != other.m_uuid_buffer[index])
return false;
}
return true;
}
bool UUID::is_zero() const
{
return all_of(m_uuid_buffer, [](auto const octet) { return octet == 0; });

7
AK/UUID.h
View File

@ -31,12 +31,7 @@ public:
UUID(StringView, Endianness endianness = Endianness::Little);
~UUID() = default;
bool operator==(const UUID&) const;
bool operator!=(const UUID& other) const { return !(*this == other); }
bool operator<=(const UUID&) const = delete;
bool operator>=(const UUID&) const = delete;
bool operator<(const UUID&) const = delete;
bool operator>(const UUID&) const = delete;
bool operator==(const UUID&) const = default;
#ifdef KERNEL
ErrorOr<NonnullOwnPtr<Kernel::KString>> to_string() const;

5
AK/Utf16View.h
View File

@ -35,11 +35,6 @@ public:
return (m_ptr == other.m_ptr) && (m_remaining_code_units == other.m_remaining_code_units);
}
bool operator!=(Utf16CodePointIterator const& other) const
{
return !(*this == other);
}
Utf16CodePointIterator& operator++();
u32 operator*() const;

4
AK/Utf32View.h
View File

@ -25,10 +25,6 @@ public:
{
return m_ptr == other.m_ptr && m_length == other.m_length;
}
bool operator!=(Utf32CodePointIterator const& other) const
{
return !(*this == other);
}
Utf32CodePointIterator& operator++()
{
VERIFY(m_length > 0);

5
Userland/Applications/Spreadsheet/Position.h
View File

@ -37,11 +37,6 @@ struct Position {
return row == other.row && column == other.column;
}
bool operator!=(Position const& other) const
{
return !(other == *this);
}
String to_cell_identifier(Sheet const& sheet) const;
URL to_url(Sheet const& sheet) const;

1
Userland/Libraries/LibDebug/DebugInfo.h
View File

@ -50,7 +50,6 @@ public:
}
bool operator==(SourcePosition const& other) const { return file_path == other.file_path && line_number == other.line_number; }
bool operator!=(SourcePosition const& other) const { return !(*this == other); }
static SourcePosition from_line_info(Dwarf::LineProgram::LineInfo const&);
};

1
Userland/Libraries/LibDeviceTree/FlattenedDeviceTree.h
View File

@ -34,7 +34,6 @@ struct FlattenedDeviceTreeReserveEntry {
BigEndian<u64> size;
bool operator==(FlattenedDeviceTreeReserveEntry const& other) const { return other.address == address && other.size == size; }
bool operator!=(FlattenedDeviceTreeReserveEntry const& other) const { return !(operator==(other)); }
};
static_assert(sizeof(FlattenedDeviceTreeReserveEntry) == 16, "FDT Memory Reservation entry size must match specification");

5
Userland/Libraries/LibGUI/ModelIndex.h
View File

@ -33,11 +33,6 @@ public:
return m_model == other.m_model && m_row == other.m_row && m_column == other.m_column && m_internal_data == other.m_internal_data;
}
bool operator!=(ModelIndex const& other) const
{
return !(*this == other);
}
Model const* model() const { return m_model; }
Variant data(ModelRole = ModelRole::Display) const;

5
Userland/Libraries/LibGfx/Color.h
View File

@ -350,11 +350,6 @@ public:
return m_value == other.m_value;
}
constexpr bool operator!=(Color const& other) const
{
return m_value != other.m_value;
}
String to_string() const;
String to_string_without_alpha() const;
static Optional<Color> from_string(StringView);

6
Userland/Libraries/LibGfx/Point.h
View File

@ -132,12 +132,6 @@ public:
return x() == other.x() && y() == other.y();
}
template<class U>
[[nodiscard]] bool operator!=(Point<U> const& other) const
{
return !(*this == other);
}
[[nodiscard]] Point<T> operator+(Point<T> const& other) const { return { m_x + other.m_x, m_y + other.m_y }; }
Point<T>& operator+=(Point<T> const& other)

6
Userland/Libraries/LibGfx/Rect.h
View File

@ -477,12 +477,6 @@ public:
return location() == other.location() && size() == other.size();
}
template<class U>
[[nodiscard]] bool operator!=(Rect<U> const& other) const
{
return !(*this == other);
}
[[nodiscard]] Rect<T> operator*(T factor) const { return { m_location * factor, m_size * factor }; }
Rect<T>& operator*=(T factor)

6
Userland/Libraries/LibGfx/Size.h
View File

@ -99,12 +99,6 @@ public:
return width() == other.width() && height() == other.height();
}
template<class U>
[[nodiscard]] constexpr bool operator!=(Size<U> const& other) const
{
return !(*this == other);
}
constexpr Size<T>& operator-=(Size<T> const& other)
{
m_width -= other.m_width;

1
Userland/Libraries/LibJS/Runtime/PropertyAttributes.h
View File

@ -59,7 +59,6 @@ public:
}
bool operator==(PropertyAttributes const& other) const { return m_bits == other.m_bits; }
bool operator!=(PropertyAttributes const& other) const { return m_bits != other.m_bits; }
[[nodiscard]] u8 bits() const { return m_bits; }

5
Userland/Libraries/LibLine/KeyCallbackMachine.h
View File

@ -38,11 +38,6 @@ struct Key {
{
return other.key == key && other.modifiers == modifiers;
}
bool operator!=(Key const& other) const
{
return !(*this == other);
}
};
struct KeyCallback {

25
Userland/Libraries/LibRegex/RegexMatch.h
View File

@ -310,11 +310,6 @@ public:
[&](StringView view) { return view == cstring; });
}
bool operator!=(char const* cstring) const
{
return !(*this == cstring);
}
bool operator==(String const& string) const
{
return m_view.visit(
@ -333,11 +328,6 @@ public:
[&](StringView view) { return view == string; });
}
bool operator!=(StringView other) const
{
return !(*this == other);
}
bool operator==(Utf32View const& other) const
{
return m_view.visit(
@ -349,11 +339,6 @@ public:
[&](StringView view) { return view == RegexStringView { other }.to_string(); });
}
bool operator!=(Utf32View const& other) const
{
return !(*this == other);
}
bool operator==(Utf16View const& other) const
{
return m_view.visit(
@ -363,11 +348,6 @@ public:
[&](StringView view) { return view == RegexStringView { other }.to_string(); });
}
bool operator!=(Utf16View const& other) const
{
return !(*this == other);
}
bool operator==(Utf8View const& other) const
{
return m_view.visit(
@ -377,11 +357,6 @@ public:
[&](StringView view) { return other.as_string() == view; });
}
bool operator!=(Utf8View const& other) const
{
return !(*this == other);
}
bool equals(RegexStringView other) const
{
return other.m_view.visit([this](auto const& view) { return operator==(view); });

2
Userland/Libraries/LibSQL/HashIndex.h
View File

@ -118,9 +118,7 @@ public:
[[nodiscard]] bool is_end() const { return !m_current; }
bool operator==(HashIndexIterator const& other) const;
bool operator!=(HashIndexIterator const& other) const { return !(*this == other); }
bool operator==(Key const& other) const;
bool operator!=(Key const& other) const { return !(*this == other); }
HashIndexIterator operator++()
{

4
Userland/Libraries/LibVT/Attribute.h
View File

@ -63,10 +63,6 @@ struct Attribute {
{
return foreground_color == other.foreground_color && background_color == other.background_color && flags == other.flags;
}
constexpr bool operator!=(Attribute const& other) const
{
return !(*this == other);
}
};
}

5
Userland/Libraries/LibWeb/CSS/Angle.h
View File

@ -43,11 +43,6 @@ public:
return m_type == other.m_type && m_value == other.m_value;
}
bool operator!=(Angle const& other) const
{
return !(*this == other);
}
private:
StringView unit_name() const;

2
Userland/Libraries/LibWeb/CSS/Display.h
View File

@ -35,8 +35,6 @@ public:
VERIFY_NOT_REACHED();
}
bool operator!=(Display const& other) const { return !(*this == other); }
enum class Outside {
Block,
Inline,

5
Userland/Libraries/LibWeb/CSS/Frequency.h
View File

@ -40,11 +40,6 @@ public:
return m_type == other.m_type && m_value == other.m_value;
}
bool operator!=(Frequency const& other) const
{
return !(*this == other);
}
private:
StringView unit_name() const;

4
Userland/Libraries/LibWeb/CSS/Length.h
View File

@ -121,10 +121,6 @@ public:
// We have a RefPtr<CalculatedStyleValue> member, but can't include the header StyleValue.h as it includes
// this file already. To break the cyclic dependency, we must move all method definitions out.
bool operator==(Length const& other) const;
bool operator!=(Length const& other) const
{
return !(*this == other);
}
float relative_length_to_px(Gfx::IntRect const& viewport_rect, Gfx::FontPixelMetrics const& font_metrics, float font_size, float root_font_size) const;

2
Userland/Libraries/LibWeb/CSS/Percentage.h
View File

@ -37,7 +37,6 @@ public:
}
bool operator==(Percentage const& other) const { return m_value == other.m_value; }
bool operator!=(Percentage const& other) const { return !(*this == other); }
private:
float m_value;
@ -147,7 +146,6 @@ public:
return (m_value.template get<Percentage>() == other.m_value.template get<Percentage>());
return (m_value.template get<T>() == other.m_value.template get<T>());
}
bool operator!=(PercentageOr<T> const& other) const { return !(*this == other); }
protected:
bool is_t() const { return m_value.template has<T>(); }

5
Userland/Libraries/LibWeb/CSS/Resolution.h
View File

@ -32,11 +32,6 @@ public:
return m_type == other.m_type && m_value == other.m_value;
}
bool operator!=(Resolution const& other) const
{
return !(*this == other);
}
private:
StringView unit_name() const;

1
Userland/Libraries/LibWeb/CSS/StyleProperties.h
View File

@ -109,7 +109,6 @@ public:
float line_height(Layout::Node const&) const;
bool operator==(StyleProperties const&) const;
bool operator!=(StyleProperties const& other) const { return !(*this == other); }
Optional<CSS::Position> position() const;
Optional<int> z_index() const;

1
Userland/Libraries/LibWeb/CSS/StyleValue.h
View File

@ -402,7 +402,6 @@ public:
virtual String to_string() const = 0;
bool operator==(StyleValue const& other) const { return equals(other); }
bool operator!=(StyleValue const& other) const { return !(*this == other); }
virtual bool equals(StyleValue const& other) const = 0;

5
Userland/Libraries/LibWeb/CSS/Time.h
View File

@ -41,11 +41,6 @@ public:
return m_type == other.m_type && m_value == other.m_value;
}
bool operator!=(Time const& other) const
{
return !(*this == other);
}
private:
StringView unit_name() const;

5
Userland/Libraries/LibWeb/DOM/Position.h
View File

@ -35,11 +35,6 @@ public:
return m_node.ptr() == other.m_node.ptr() && m_offset == other.m_offset;
}
bool operator!=(Position const& other) const
{
return !(*this == other);
}
String to_string() const;
private:

1
Userland/Libraries/LibWeb/HTML/Origin.h
View File

@ -106,7 +106,6 @@ public:
}
bool operator==(Origin const& other) const { return is_same_origin(other); }
bool operator!=(Origin const& other) const { return !is_same_origin(other); }
private:
String m_scheme;