#pragma once
#include "HandleTypes.h"
namespace JSC {
template <class T> class Handle;
template <> class Handle<JSValue>;
class HandleBase {
template <typename T> friend class Weak;
template <typename T> friend class Strong;
friend class HandleSet;
friend struct JSCallbackObjectData;
public:
bool operator!() const { return !m_slot || !*m_slot; }
explicit operator bool() const { return m_slot && *m_slot; }
HandleSlot slot() const { return m_slot; }
protected:
HandleBase(HandleSlot slot)
: m_slot(slot)
{
}
void swap(HandleBase& other) { std::swap(m_slot, other.m_slot); }
void setSlot(HandleSlot slot)
{
m_slot = slot;
}
private:
HandleSlot m_slot;
};
template <typename Base, typename T> struct HandleConverter {
T* operator->()
{
return static_cast<Base*>(this)->get();
}
const T* operator->() const
{
return static_cast<const Base*>(this)->get();
}
T* operator*()
{
return static_cast<Base*>(this)->get();
}
const T* operator*() const
{
return static_cast<const Base*>(this)->get();
}
};
template <typename Base> struct HandleConverter<Base, Unknown> {
Handle<JSObject> asObject() const;
bool isObject() const { return jsValue().isObject(); }
bool getNumber(double number) const { return jsValue().getNumber(number); }
WTF::String getString(ExecState*) const;
bool isUndefinedOrNull() const { return jsValue().isUndefinedOrNull(); }
private:
JSValue jsValue() const
{
return static_cast<const Base*>(this)->get();
}
};
template <typename T> class Handle : public HandleBase, public HandleConverter<Handle<T>, T> {
public:
template <typename A, typename B> friend struct HandleConverter;
typedef typename HandleTypes<T>::ExternalType ExternalType;
template <typename U> Handle(Handle<U> o)
{
typename HandleTypes<T>::template validateUpcast<U>();
setSlot(o.slot());
}
void swap(Handle& other) { HandleBase::swap(other); }
ExternalType get() const { return HandleTypes<T>::getFromSlot(this->slot()); }
protected:
Handle(HandleSlot slot = 0)
: HandleBase(slot)
{
}
private:
friend class HandleSet;
friend class WeakBlock;
static Handle<T> wrapSlot(HandleSlot slot)
{
return Handle<T>(slot);
}
};
template <typename Base> Handle<JSObject> HandleConverter<Base, Unknown>::asObject() const
{
return Handle<JSObject>::wrapSlot(static_cast<const Base*>(this)->slot());
}
template <typename T, typename U> inline bool operator==(const Handle<T>& a, const Handle<U>& b)
{
return a.get() == b.get();
}
template <typename T, typename U> inline bool operator==(const Handle<T>& a, U* b)
{
return a.get() == b;
}
template <typename T, typename U> inline bool operator==(T* a, const Handle<U>& b)
{
return a == b.get();
}
template <typename T, typename U> inline bool operator!=(const Handle<T>& a, const Handle<U>& b)
{
return a.get() != b.get();
}
template <typename T, typename U> inline bool operator!=(const Handle<T>& a, U* b)
{
return a.get() != b;
}
template <typename T, typename U> inline bool operator!=(T* a, const Handle<U>& b)
{
return a != b.get();
}
template <typename T, typename U> inline bool operator!=(const Handle<T>& a, JSValue b)
{
return a.get() != b;
}
template <typename T, typename U> inline bool operator!=(JSValue a, const Handle<U>& b)
{
return a != b.get();
}
}