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/*
* Copyright (c) 2018-2020, Andreas Kling <kling@serenityos.org>
*
* SPDX-License-Identifier: BSD-2-Clause
*/
#pragma once
#include <AK/Forward.h>
#include <AK/HashTable.h>
namespace AK {
class IDAllocator {
public:
IDAllocator() = default;
~IDAllocator() = default;
int allocate()
{
int r = rand();
for (int i = 0; i < 100000; ++i) {
int allocated_id = r + i;
// Make sure we never vend ID 0, as some code may interpret that as "no ID"
if (allocated_id == 0)
++allocated_id;
if (!m_allocated_ids.contains(allocated_id)) {
m_allocated_ids.set(allocated_id);
return allocated_id;
}
}
VERIFY_NOT_REACHED();
}
void deallocate(int id)
{
m_allocated_ids.remove(id);
}
private:
HashTable<int> m_allocated_ids;
};
}
using AK::IDAllocator;
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