ladybird/Libraries/LibJS/Runtime/SetIterator.h
Aliaksandr Kalenik ab52d86a69 LibJS: Allow advancing built-in iterators without result object creation
Expose a method on built-in iterators that allows retrieving the next
iteration result without allocating a JS::Object. This change is a
preparation for optimizing for..of and for..in loops.
2025-04-30 20:51:39 +02:00

41 lines
1 KiB
C++

/*
* Copyright (c) 2021, Idan Horowitz <idan.horowitz@serenityos.org>
*
* SPDX-License-Identifier: BSD-2-Clause
*/
#pragma once
#include <LibJS/Runtime/Iterator.h>
#include <LibJS/Runtime/Object.h>
#include <LibJS/Runtime/Set.h>
namespace JS {
class SetIterator final : public Object
, public BuiltinIterator {
JS_OBJECT(SetIterator, Object);
GC_DECLARE_ALLOCATOR(SetIterator);
public:
static GC::Ref<SetIterator> create(Realm&, Set& set, Object::PropertyKind iteration_kind);
virtual ~SetIterator() override = default;
BuiltinIterator* as_builtin_iterator() override { return this; }
ThrowCompletionOr<void> next(VM&, bool& done, Value& value) override;
private:
friend class SetIteratorPrototype;
explicit SetIterator(Set& set, Object::PropertyKind iteration_kind, Object& prototype);
virtual void visit_edges(Cell::Visitor&) override;
GC::Ref<Set> m_set;
bool m_done { false };
Object::PropertyKind m_iteration_kind;
Map::ConstIterator m_iterator;
};
}