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26 #ifndef WTF_PassOwnArrayPtr_h
27 #define WTF_PassOwnArrayPtr_h
29 #include <wtf/Assertions.h>
30 #include <wtf/NullPtr.h>
31 #include <wtf/TypeTraits.h>
35 template<typename T> class OwnArrayPtr;
36 template<typename T> class PassOwnArrayPtr;
37 template<typename T> PassOwnArrayPtr<T> adoptArrayPtr(T*);
38 template<typename T> void deleteOwnedArrayPtr(T* ptr);
40 template<typename T> class PassOwnArrayPtr {
44 PassOwnArrayPtr() : m_ptr(0) { }
45 PassOwnArrayPtr(std::nullptr_t) : m_ptr(0) { }
47 // It somewhat breaks the type system to allow transfer of ownership out of
48 // a const PassOwnArrayPtr. However, it makes it much easier to work with PassOwnArrayPtr
49 // temporaries, and we don't have a need to use real const PassOwnArrayPtrs anyway.
50 PassOwnArrayPtr(const PassOwnArrayPtr& o) : m_ptr(o.leakPtr()) { }
51 template<typename U> PassOwnArrayPtr(const PassOwnArrayPtr<U>& o) : m_ptr(o.leakPtr()) { }
53 ~PassOwnArrayPtr() { deleteOwnedArrayPtr(m_ptr); }
55 PtrType get() const { return m_ptr; }
57 PtrType leakPtr() const WARN_UNUSED_RETURN;
59 T& operator*() const { ASSERT(m_ptr); return *m_ptr; }
60 PtrType operator->() const { ASSERT(m_ptr); return m_ptr; }
62 bool operator!() const { return !m_ptr; }
64 // This conversion operator allows implicit conversion to bool but not to other integer types.
65 typedef PtrType PassOwnArrayPtr::*UnspecifiedBoolType;
66 operator UnspecifiedBoolType() const { return m_ptr ? &PassOwnArrayPtr::m_ptr : 0; }
68 PassOwnArrayPtr& operator=(const PassOwnArrayPtr&) { COMPILE_ASSERT(!sizeof(T*), PassOwnArrayPtr_should_never_be_assigned_to); return *this; }
70 template<typename U> friend PassOwnArrayPtr<U> adoptArrayPtr(U*);
73 explicit PassOwnArrayPtr(PtrType ptr) : m_ptr(ptr) { }
75 mutable PtrType m_ptr;
78 template<typename T> inline typename PassOwnArrayPtr<T>::PtrType PassOwnArrayPtr<T>::leakPtr() const
85 template<typename T, typename U> inline bool operator==(const PassOwnArrayPtr<T>& a, const PassOwnArrayPtr<U>& b)
87 return a.get() == b.get();
90 template<typename T, typename U> inline bool operator==(const PassOwnArrayPtr<T>& a, const OwnArrayPtr<U>& b)
92 return a.get() == b.get();
95 template<typename T, typename U> inline bool operator==(const OwnArrayPtr<T>& a, const PassOwnArrayPtr<U>& b)
97 return a.get() == b.get();
100 template<typename T, typename U> inline bool operator==(const PassOwnArrayPtr<T>& a, U* b)
105 template<typename T, typename U> inline bool operator==(T* a, const PassOwnArrayPtr<U>& b)
110 template<typename T, typename U> inline bool operator!=(const PassOwnArrayPtr<T>& a, const PassOwnArrayPtr<U>& b)
112 return a.get() != b.get();
115 template<typename T, typename U> inline bool operator!=(const PassOwnArrayPtr<T>& a, const OwnArrayPtr<U>& b)
117 return a.get() != b.get();
120 template<typename T, typename U> inline bool operator!=(const OwnArrayPtr<T>& a, const PassOwnArrayPtr<U>& b)
122 return a.get() != b.get();
125 template<typename T, typename U> inline bool operator!=(const PassOwnArrayPtr<T>& a, U* b)
130 template<typename T, typename U> inline bool operator!=(T* a, const PassOwnArrayPtr<U>& b)
135 template<typename T> inline PassOwnArrayPtr<T> adoptArrayPtr(T* ptr)
137 return PassOwnArrayPtr<T>(ptr);
140 template<typename T> inline void deleteOwnedArrayPtr(T* ptr)
142 typedef char known[sizeof(T) ? 1 : -1];
147 template<typename T, typename U> inline PassOwnArrayPtr<T> static_pointer_cast(const PassOwnArrayPtr<U>& p)
149 return adoptArrayPtr(static_cast<T*>(p.leakPtr()));
152 template<typename T, typename U> inline PassOwnArrayPtr<T> const_pointer_cast(const PassOwnArrayPtr<U>& p)
154 return adoptArrayPtr(const_cast<T*>(p.leakPtr()));
157 template<typename T> inline T* getPtr(const PassOwnArrayPtr<T>& p)
164 using WTF::PassOwnArrayPtr;
165 using WTF::adoptArrayPtr;
166 using WTF::const_pointer_cast;
167 using WTF::static_pointer_cast;
169 #endif // WTF_PassOwnArrayPtr_h