#ifndef WTF_OwnPtr_h
#define WTF_OwnPtr_h
#include <algorithm>
#include <wtf/Assertions.h>
#include <wtf/Noncopyable.h>
#if PLATFORM(WIN)
typedef struct HBITMAP__* HBITMAP;
typedef struct HBRUSH__* HBRUSH;
typedef struct HFONT__* HFONT;
typedef struct HPALETTE__* HPALETTE;
typedef struct HPEN__* HPEN;
typedef struct HRGN__* HRGN;
#endif
namespace WTF {
template <typename T> struct OwnPtrRemovePointer { typedef T type; };
template <typename T> struct OwnPtrRemovePointer<T*> { typedef T type; };
template <typename T> inline void deleteOwnedPtr(T* ptr)
{
typedef char known[sizeof(T) ? 1 : -1];
if (sizeof(known))
delete ptr;
}
#if PLATFORM(WIN)
void deleteOwnedPtr(HBITMAP);
void deleteOwnedPtr(HBRUSH);
void deleteOwnedPtr(HFONT);
void deleteOwnedPtr(HPALETTE);
void deleteOwnedPtr(HPEN);
void deleteOwnedPtr(HRGN);
#endif
template <typename T> class OwnPtr : Noncopyable {
public:
typedef typename OwnPtrRemovePointer<T>::type ValueType;
typedef ValueType* PtrType;
explicit OwnPtr(PtrType ptr = 0) : m_ptr(ptr) { }
~OwnPtr() { deleteOwnedPtr(m_ptr); }
PtrType get() const { return m_ptr; }
PtrType release() { PtrType ptr = m_ptr; m_ptr = 0; return ptr; }
void set(PtrType ptr) { ASSERT(!ptr || m_ptr != ptr); deleteOwnedPtr(m_ptr); m_ptr = ptr; }
void clear() { deleteOwnedPtr(m_ptr); m_ptr = 0; }
ValueType& operator*() const { ASSERT(m_ptr); return *m_ptr; }
PtrType operator->() const { ASSERT(m_ptr); return m_ptr; }
bool operator!() const { return !m_ptr; }
typedef PtrType (OwnPtr::*UnspecifiedBoolType)() const;
operator UnspecifiedBoolType() const { return m_ptr ? &OwnPtr::get : 0; }
void swap(OwnPtr& o) { std::swap(m_ptr, o.m_ptr); }
private:
PtrType m_ptr;
};
template <typename T> inline void swap(OwnPtr<T>& a, OwnPtr<T>& b) { a.swap(b); }
template <typename T> inline typename OwnPtr<T>::PtrType getPtr(const OwnPtr<T>& p)
{
return p.get();
}
}
using WTF::OwnPtr;
#endif // WTF_OwnPtr_h