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4296425bd8
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
80 lines
2.1 KiB
C++
80 lines
2.1 KiB
C++
/*
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* Copyright (c) 2018-2021, Andreas Kling <kling@serenityos.org>
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*
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* SPDX-License-Identifier: BSD-2-Clause
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*/
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#pragma once
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#include <AK/Format.h>
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#include <AK/Traits.h>
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#include <LibGUI/Forward.h>
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#include <LibGUI/ModelRole.h>
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namespace GUI {
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class ModelIndex {
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friend class Model;
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public:
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ModelIndex() = default;
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bool is_valid() const { return m_model && m_row != -1 && m_column != -1; }
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int row() const { return m_row; }
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int column() const { return m_column; }
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void* internal_data() const { return m_internal_data; }
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ModelIndex parent() const;
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bool is_parent_of(ModelIndex const&) const;
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bool operator==(ModelIndex const& other) const
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{
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return m_model == other.m_model && m_row == other.m_row && m_column == other.m_column && m_internal_data == other.m_internal_data;
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}
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Model const* model() const { return m_model; }
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Variant data(ModelRole = ModelRole::Display) const;
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ModelIndex sibling(int row, int column) const;
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ModelIndex sibling_at_column(int column) const;
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private:
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ModelIndex(Model const& model, int row, int column, void* internal_data)
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: m_model(&model)
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, m_row(row)
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, m_column(column)
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, m_internal_data(internal_data)
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{
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}
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Model const* m_model { nullptr };
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int m_row { -1 };
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int m_column { -1 };
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void* m_internal_data { nullptr };
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};
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}
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namespace AK {
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template<>
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struct Formatter<GUI::ModelIndex> : Formatter<FormatString> {
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ErrorOr<void> format(FormatBuilder& builder, GUI::ModelIndex const& value)
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{
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if (value.internal_data())
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return Formatter<FormatString>::format(builder, "ModelIndex({},{},{})"sv, value.row(), value.column(), value.internal_data());
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return Formatter<FormatString>::format(builder, "ModelIndex({},{})"sv, value.row(), value.column());
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}
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};
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template<>
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struct Traits<GUI::ModelIndex> : public GenericTraits<GUI::ModelIndex> {
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static unsigned hash(const GUI::ModelIndex& index)
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{
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return pair_int_hash(pair_int_hash(index.row(), index.column()), reinterpret_cast<FlatPtr>(index.internal_data()));
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}
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};
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}
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