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AK: Add enqueue_begin() for the CircularDeque class (#1320)
Also add tests for CircularDeque.
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@ -35,6 +35,24 @@ 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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84
AK/Tests/TestCircularDeque.cpp
Normal file
84
AK/Tests/TestCircularDeque.cpp
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@ -0,0 +1,84 @@
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/*
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* Copyright (c) 2018-2020, Fei Wu <f.eiwu@yahoo.com>
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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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#include <AK/CircularDeque.h>
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#include <AK/StdLibExtras.h>
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#include <AK/String.h>
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#include <AK/TestSuite.h>
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TEST_CASE(enqueue_begin)
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{
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CircularDeque<int, 3> ints;
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ints.enqueue_begin(0);
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EXPECT_EQ(ints.size(), 1);
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EXPECT_EQ(ints.first(), 0);
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ints.enqueue_begin(1);
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EXPECT_EQ(ints.size(), 2);
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EXPECT_EQ(ints.first(), 1);
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EXPECT_EQ(ints.last(), 0);
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ints.enqueue_begin(2);
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EXPECT_EQ(ints.size(), 3);
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EXPECT_EQ(ints.first(), 2);
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EXPECT_EQ(ints.last(), 0);
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ints.enqueue_begin(3);
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EXPECT_EQ(ints.size(), 3);
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EXPECT_EQ(ints.first(), 3);
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EXPECT_EQ(ints.at(1), 2);
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EXPECT_EQ(ints.last(), 1);
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}
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TEST_CASE(enqueue_begin_being_moved_from)
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{
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CircularDeque<String, 2> strings;
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String str{"test"};
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strings.enqueue_begin(move(str));
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EXPECT(str.is_null());
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}
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TEST_CASE(deque_end)
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{
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CircularDeque<int, 3> ints;
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ints.enqueue(0);
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ints.enqueue(1);
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ints.enqueue(2);
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EXPECT_EQ(ints.size(), 3);
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EXPECT_EQ(ints.dequeue_end(), 2);
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EXPECT_EQ(ints.size(), 2);
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EXPECT_EQ(ints.dequeue_end(), 1);
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EXPECT_EQ(ints.size(), 1);
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EXPECT_EQ(ints.dequeue_end(), 0);
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EXPECT(ints.is_empty());
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}
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TEST_MAIN(CircularDeque)
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