#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()
{
}
Bag(Bag<T>&& other)
{
ASSERT(!m_head);
m_head = other.m_head;
other.m_head = nullptr;
}
Bag& operator=(Bag<T>&& other)
{
m_head = other.m_head;
other.m_head = nullptr;
return *this;
}
~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)
{
}
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 { nullptr };
};
}
using WTF::Bag;
#endif // Bag_h