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https://github.com/RGBCube/serenity
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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
87 lines
1.8 KiB
C++
87 lines
1.8 KiB
C++
/*
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* Copyright (c) 2020, the SerenityOS developers.
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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/Function.h>
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#include <AK/HashMap.h>
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#include <AK/String.h>
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#include <AK/Vector.h>
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namespace Line {
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class Editor;
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struct Key {
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enum Modifier : int {
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None = 0,
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Alt = 1,
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};
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int modifiers { None };
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unsigned key { 0 };
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Key(unsigned c)
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: modifiers(None)
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, key(c) {};
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Key(unsigned c, int modifiers)
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: modifiers(modifiers)
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, key(c)
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{
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}
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bool operator==(Key const& other) const
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{
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return other.key == key && other.modifiers == modifiers;
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}
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};
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struct KeyCallback {
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KeyCallback(Function<bool(Editor&)> cb)
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: callback(move(cb))
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{
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}
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Function<bool(Editor&)> callback;
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};
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class KeyCallbackMachine {
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public:
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void register_key_input_callback(Vector<Key>, Function<bool(Editor&)> callback);
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void key_pressed(Editor&, Key);
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void interrupted(Editor&);
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bool should_process_last_pressed_key() const { return m_should_process_this_key; }
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private:
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HashMap<Vector<Key>, NonnullOwnPtr<KeyCallback>> m_key_callbacks;
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Vector<Vector<Key>> m_current_matching_keys;
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size_t m_sequence_length { 0 };
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bool m_should_process_this_key { true };
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};
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}
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namespace AK {
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template<>
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struct Traits<Line::Key> : public GenericTraits<Line::Key> {
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static constexpr bool is_trivial() { return true; }
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static unsigned hash(Line::Key k) { return pair_int_hash(k.key, k.modifiers); }
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};
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template<>
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struct Traits<Vector<Line::Key>> : public GenericTraits<Vector<Line::Key>> {
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static constexpr bool is_trivial() { return false; }
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static unsigned hash(Vector<Line::Key> const& ks)
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{
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unsigned h = 0;
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for (auto& k : ks)
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h ^= Traits<Line::Key>::hash(k);
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return h;
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}
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};
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}
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