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66 lines
2.2 KiB
C++
66 lines
2.2 KiB
C++
/*
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* Copyright (c) 2018-2020, Andreas Kling <kling@serenityos.org>
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are met:
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*
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* 1. Redistributions of source code must retain the above copyright notice, this
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* list of conditions and the following disclaimer.
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*
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* 2. Redistributions in binary form must reproduce the above copyright notice,
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* this list of conditions and the following disclaimer in the documentation
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* and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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* DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
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* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
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* CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
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* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#pragma once
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#include <AK/Forward.h>
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#include <AK/HashTable.h>
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namespace AK {
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class IDAllocator {
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public:
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IDAllocator() = default;
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~IDAllocator() = default;
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int allocate()
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{
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int r = rand();
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for (int i = 0; i < 100000; ++i) {
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int allocated_id = r + i;
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// Make sure we never vend ID 0, as some code may interpret that as "no ID"
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if (allocated_id == 0)
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++allocated_id;
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if (!m_allocated_ids.contains(allocated_id)) {
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m_allocated_ids.set(allocated_id);
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return allocated_id;
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}
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}
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VERIFY_NOT_REACHED();
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}
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void deallocate(int id)
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{
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m_allocated_ids.remove(id);
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}
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private:
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HashTable<int> m_allocated_ids;
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};
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}
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using AK::IDAllocator;
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