#ifndef GDIObject_h
#define GDIObject_h
#include <algorithm>
#include <cstddef>
#include <memory>
#include <windows.h>
#include <wtf/Assertions.h>
#include <wtf/Noncopyable.h>
namespace WTF {
template<typename T> void deleteObject(T);
template<typename T> class GDIObject {
WTF_MAKE_NONCOPYABLE(GDIObject);
public:
GDIObject() : m_object(0) { }
GDIObject(std::nullptr_t) : m_object(0) { }
~GDIObject() { deleteObject<T>(m_object); }
T get() const { return m_object; }
void clear();
T leak() WARN_UNUSED_RETURN;
bool operator!() const { return !m_object; }
typedef const void* UnspecifiedBoolType;
operator UnspecifiedBoolType() const { return m_object ? reinterpret_cast<UnspecifiedBoolType>(&m_object) : 0; }
GDIObject<T>& operator=(std::nullptr_t) { clear(); return *this; }
GDIObject(GDIObject&&);
template<typename U> GDIObject(GDIObject<U>&&);
GDIObject& operator=(GDIObject&&);
template<typename U> GDIObject& operator=(GDIObject<U>&&);
void swap(GDIObject& o) { std::swap(m_object, o.m_object); }
private:
template<typename U> friend GDIObject<U> adoptGDIObject(U);
GDIObject(T object) : m_object(object) { }
GDIObject<T>& operator=(T);
T m_object;
};
template<typename T> inline void GDIObject<T>::clear()
{
T object = m_object;
m_object = 0;
deleteObject(object);
}
template<typename T> inline T GDIObject<T>::leak()
{
T object = m_object;
m_object = 0;
return object;
}
template<typename T> inline GDIObject<T>::GDIObject(GDIObject<T>&& other)
: m_object(other.leak())
{
}
template<typename T> inline GDIObject<T>& GDIObject<T>::operator=(GDIObject<T>&& other)
{
auto object = WTFMove(other);
swap(object);
return *this;
}
template<typename T> inline GDIObject<T> adoptGDIObject(T object)
{
return GDIObject<T>(object);
}
template<typename T> inline void swap(GDIObject<T>& a, GDIObject<T>& b)
{
a.swap(b);
}
template<typename T> inline void deleteObject<T>(T object)
{
if (object)
::DeleteObject(object);
}
template<> inline void deleteObject<HDC>(HDC hdc)
{
if (hdc)
::DeleteDC(hdc);
}
}
using WTF::GDIObject;
using WTF::adoptGDIObject;
#endif // GDIObject_h