ladybird/AK/IDAllocator.h
Brian Gianforcaro 1682f0b760 Everything: Move to SPDX license identifiers in all files.
SPDX License Identifiers are a more compact / standardized
way of representing file license information.

See: https://spdx.dev/resources/use/#identifiers

This was done with the `ambr` search and replace tool.

 ambr --no-parent-ignore --key-from-file --rep-from-file key.txt rep.txt *
2021-04-22 11:22:27 +02:00

47 lines
931 B
C++

/*
* 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;