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70 lines
2.3 KiB
C++
70 lines
2.3 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/Assertions.h>
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#include <AK/CircularQueue.h>
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#include <AK/Types.h>
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namespace AK {
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template<typename T, size_t Capacity>
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class CircularDeque : public CircularQueue<T, Capacity> {
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public:
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void enqueue_begin(T&& value)
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{
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const auto new_head = (this->m_head - 1 + Capacity) % Capacity;
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auto& slot = this->elements()[new_head];
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if (this->m_size == Capacity)
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slot.~T();
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else
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++this->m_size;
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new (&slot) T(move(value));
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this->m_head = new_head;
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}
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void enqueue_begin(const T& value)
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{
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enqueue_begin(T(value));
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}
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T dequeue_end()
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{
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ASSERT(!this->is_empty());
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auto& slot = this->elements()[(this->m_head + this->m_size - 1) % Capacity];
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T value = move(slot);
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slot.~T();
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this->m_size--;
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return value;
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}
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};
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}
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using AK::CircularDeque;
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