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109 lines
3.0 KiB
C++
109 lines
3.0 KiB
C++
/*
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* Copyright (C) 2013 Google Inc. 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
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* met:
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*
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* * Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* * Redistributions in binary form must reproduce the above
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* copyright notice, this list of conditions and the following disclaimer
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* in the documentation and/or other materials provided with the
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* distribution.
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* * Neither the name of Google Inc. nor the names of its
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* contributors may be used to endorse or promote products derived from
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* this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (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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#ifndef SKY_ENGINE_WTF_LINKEDSTACK_H_
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#define SKY_ENGINE_WTF_LINKEDSTACK_H_
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#include "flutter/sky/engine/wtf/FastAllocBase.h"
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#include "flutter/sky/engine/wtf/OwnPtr.h"
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namespace WTF {
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template <typename T>
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class LinkedStack {
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WTF_MAKE_FAST_ALLOCATED;
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public:
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LinkedStack() : m_size(0) {}
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bool isEmpty();
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void push(const T&);
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const T& peek();
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void pop();
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size_t size();
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// This inner class used to be private but is now public on account of a
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// possible MSVC bug. It can be made private again if we get rid of
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// WTF_MAKE_FAST_ALLOCATED ever.
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class Node {
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WTF_MAKE_FAST_ALLOCATED;
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public:
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Node(const T&, PassOwnPtr<Node> next);
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T m_data;
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OwnPtr<Node> m_next;
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};
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private:
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OwnPtr<Node> m_head;
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size_t m_size;
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};
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template <typename T>
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LinkedStack<T>::Node::Node(const T& data, PassOwnPtr<Node> next)
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: m_data(data), m_next(next) {}
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template <typename T>
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inline bool LinkedStack<T>::isEmpty() {
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return !m_head;
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}
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template <typename T>
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inline void LinkedStack<T>::push(const T& data) {
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m_head = adoptPtr(new Node(data, m_head.release()));
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++m_size;
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}
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template <typename T>
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inline const T& LinkedStack<T>::peek() {
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return m_head->m_data;
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}
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template <typename T>
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inline void LinkedStack<T>::pop() {
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ASSERT(m_head && m_size);
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m_head = m_head->m_next.release();
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--m_size;
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}
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template <typename T>
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inline size_t LinkedStack<T>::size() {
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return m_size;
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}
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} // namespace WTF
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using WTF::LinkedStack;
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#endif // SKY_ENGINE_WTF_LINKEDSTACK_H_
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