#ifndef Weak_h
#define Weak_h
#include <wtf/Assertions.h>
#include "PassWeak.h"
#include "WeakSetInlines.h"
namespace JSC {
template<typename T> class Weak : public WeakImplAccessor<Weak<T>, T> {
WTF_MAKE_NONCOPYABLE(Weak);
public:
friend class WeakImplAccessor<Weak<T>, T>;
typedef typename WeakImplAccessor<Weak<T>, T>::GetType GetType;
Weak();
Weak(std::nullptr_t);
Weak(GetType, WeakHandleOwner* = 0, void* context = 0);
enum HashTableDeletedValueTag { HashTableDeletedValue };
bool isHashTableDeletedValue() const;
Weak(HashTableDeletedValueTag);
template<typename U> Weak(const PassWeak<U>&);
~Weak();
void swap(Weak&);
Weak& operator=(const PassWeak<T>&);
bool operator!() const;
typedef JSValue (HandleBase::*UnspecifiedBoolType);
operator UnspecifiedBoolType*() const;
PassWeak<T> release();
void clear();
private:
static WeakImpl* hashTableDeletedValue();
WeakImpl* m_impl;
};
template<typename T> inline Weak<T>::Weak()
: m_impl(0)
{
}
template<typename T> inline Weak<T>::Weak(std::nullptr_t)
: m_impl(0)
{
}
template<typename T> inline Weak<T>::Weak(typename Weak<T>::GetType getType, WeakHandleOwner* weakOwner, void* context)
: m_impl(getType ? WeakSet::allocate(getType, weakOwner, context) : 0)
{
}
template<typename T> inline bool Weak<T>::isHashTableDeletedValue() const
{
return m_impl == hashTableDeletedValue();
}
template<typename T> inline Weak<T>::Weak(typename Weak<T>::HashTableDeletedValueTag)
: m_impl(hashTableDeletedValue())
{
}
template<typename T> template<typename U> inline Weak<T>::Weak(const PassWeak<U>& other)
: m_impl(other.leakImpl())
{
}
template<typename T> inline Weak<T>::~Weak()
{
clear();
}
template<class T> inline void swap(Weak<T>& a, Weak<T>& b)
{
a.swap(b);
}
template<typename T> inline void Weak<T>::swap(Weak& other)
{
std::swap(m_impl, other.m_impl);
}
template<typename T> inline Weak<T>& Weak<T>::operator=(const PassWeak<T>& o)
{
clear();
m_impl = o.leakImpl();
return *this;
}
template<typename T> inline bool Weak<T>::operator!() const
{
return !m_impl || !m_impl->jsValue() || m_impl->state() != WeakImpl::Live;
}
template<typename T> inline Weak<T>::operator UnspecifiedBoolType*() const
{
return reinterpret_cast<UnspecifiedBoolType*>(!!*this);
}
template<typename T> inline PassWeak<T> Weak<T>::release()
{
PassWeak<T> tmp = adoptWeak<T>(m_impl);
m_impl = 0;
return tmp;
}
template<typename T> inline void Weak<T>::clear()
{
if (!m_impl)
return;
WeakSet::deallocate(m_impl);
m_impl = 0;
}
template<typename T> inline WeakImpl* Weak<T>::hashTableDeletedValue()
{
return reinterpret_cast<WeakImpl*>(-1);
}
}
namespace WTF {
template<typename T> struct VectorTraits<JSC::Weak<T> > : SimpleClassVectorTraits {
static const bool canCompareWithMemcmp = false;
};
template<typename T> struct HashTraits<JSC::Weak<T> > : SimpleClassHashTraits<JSC::Weak<T> > {
typedef JSC::Weak<T> StorageType;
typedef std::nullptr_t EmptyValueType;
static EmptyValueType emptyValue() { return nullptr; }
typedef JSC::PassWeak<T> PassInType;
static void store(PassInType value, StorageType& storage) { storage = value; }
typedef JSC::PassWeak<T> PassOutType;
static PassOutType passOut(StorageType& value) { return value.release(); }
static PassOutType passOut(EmptyValueType) { return PassOutType(); }
typedef typename StorageType::GetType PeekType;
static PeekType peek(const StorageType& value) { return value.get(); }
static PeekType peek(EmptyValueType) { return PeekType(); }
};
}
#endif // Weak_h