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/*
* Copyright (C) 2013 Apple Inc. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS CONTRIBUTORS ``AS IS''
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
* THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS
* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
* THE POSSIBILITY OF SUCH DAMAGE.
*/
#ifndef Bag_h
#define Bag_h
namespace WTF {
template<typename T>
class Bag {
WTF_MAKE_NONCOPYABLE(Bag);
WTF_MAKE_FAST_ALLOCATED;
private:
class Node {
WTF_MAKE_FAST_ALLOCATED;
public:
template<typename... Args>
Node(Args... args)
: m_item(args...)
{
}
T m_item;
Node* m_next;
};
public:
Bag()
: m_head(nullptr)
{
}
~Bag()
{
clear();
}
void clear()
{
while (m_head) {
Node* current = m_head;
m_head = current->m_next;
delete current;
}
m_head = nullptr;
}
template<typename... Args>
T* add(Args... args)
{
Node* newNode = new Node(args...);
newNode->m_next = m_head;
m_head = newNode;
return &newNode->m_item;
}
class iterator {
public:
iterator()
: m_node(0)
{
}
// This is sort of cheating; it's equivalent to iter == end().
bool operator!() const { return !m_node; }
T* operator*() const { return &m_node->m_item; }
iterator& operator++()
{
m_node = m_node->m_next;
return *this;
}
bool operator==(const iterator& other) const
{
return m_node == other.m_node;
}
bool operator!=(const iterator& other) const
{
return !(*this == other);
}
private:
template<typename U> friend class WTF::Bag;
Node* m_node;
};
iterator begin()
{
iterator result;
result.m_node = m_head;
return result;
}
iterator end() { return iterator(); }
bool isEmpty() const { return !m_head; }
private:
Node* m_head;
};
} // namespace WTF
using WTF::Bag;
#endif // Bag_h
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