/*
- * Copyright (C) 2006 Apple Computer, Inc.
+ * Copyright (C) 2006, 2010 Apple Inc. All rights reserved.
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Library General Public
#ifndef WTF_OwnArrayPtr_h
#define WTF_OwnArrayPtr_h
+#include "Assertions.h"
+#include "Noncopyable.h"
+#include "NullPtr.h"
+#include "PassOwnArrayPtr.h"
#include <algorithm>
-#include <wtf/Assertions.h>
-#include <wtf/Noncopyable.h>
namespace WTF {
- template <typename T> class OwnArrayPtr : public Noncopyable {
- public:
- explicit OwnArrayPtr(T* ptr = 0) : m_ptr(ptr) { }
- ~OwnArrayPtr() { safeDelete(); }
+template<typename T> class PassOwnArrayPtr;
+template<typename T> PassOwnArrayPtr<T> adoptArrayPtr(T*);
- T* get() const { return m_ptr; }
- T* release() { T* ptr = m_ptr; m_ptr = 0; return ptr; }
+template <typename T> class OwnArrayPtr {
+public:
+ typedef T* PtrType;
- void set(T* ptr) { ASSERT(m_ptr != ptr); safeDelete(); m_ptr = ptr; }
- void clear() { safeDelete(); m_ptr = 0; }
+ OwnArrayPtr() : m_ptr(0) { }
- T& operator*() const { ASSERT(m_ptr); return *m_ptr; }
- T* operator->() const { ASSERT(m_ptr); return m_ptr; }
+ // See comment in PassOwnArrayPtr.h for why this takes a const reference.
+ template<typename U> OwnArrayPtr(const PassOwnArrayPtr<U>& o);
- T& operator[](std::ptrdiff_t i) const { ASSERT(m_ptr); ASSERT(i >= 0); return m_ptr[i]; }
+ // This copy constructor is used implicitly by gcc when it generates
+ // transients for assigning a PassOwnArrayPtr<T> object to a stack-allocated
+ // OwnArrayPtr<T> object. It should never be called explicitly and gcc
+ // should optimize away the constructor when generating code.
+ OwnArrayPtr(const OwnArrayPtr<T>&);
- bool operator!() const { return !m_ptr; }
+ ~OwnArrayPtr() { deleteOwnedArrayPtr(m_ptr); }
- // This conversion operator allows implicit conversion to bool but not to other integer types.
+ PtrType get() const { return m_ptr; }
+
+ void clear();
+ PassOwnArrayPtr<T> release();
+ PtrType leakPtr() WARN_UNUSED_RETURN;
+
+ T& operator*() const { ASSERT(m_ptr); return *m_ptr; }
+ PtrType operator->() const { ASSERT(m_ptr); return m_ptr; }
+
+ T& operator[](std::ptrdiff_t i) const { ASSERT(m_ptr); ASSERT(i >= 0); return m_ptr[i]; }
+
+ bool operator!() const { return !m_ptr; }
+
+ // This conversion operator allows implicit conversion to bool but not to other integer types.
#if COMPILER(WINSCW)
- operator bool() const { return m_ptr; }
+ operator bool() const { return m_ptr; }
#else
- typedef T* OwnArrayPtr::*UnspecifiedBoolType;
- operator UnspecifiedBoolType() const { return m_ptr ? &OwnArrayPtr::m_ptr : 0; }
+ typedef T* OwnArrayPtr::*UnspecifiedBoolType;
+ operator UnspecifiedBoolType() const { return m_ptr ? &OwnArrayPtr::m_ptr : 0; }
#endif
- void swap(OwnArrayPtr& o) { std::swap(m_ptr, o.m_ptr); }
+ OwnArrayPtr& operator=(const PassOwnArrayPtr<T>&);
+ OwnArrayPtr& operator=(std::nullptr_t) { clear(); return *this; }
+ template<typename U> OwnArrayPtr& operator=(const PassOwnArrayPtr<U>&);
+
+ void swap(OwnArrayPtr& o) { std::swap(m_ptr, o.m_ptr); }
- private:
- void safeDelete() { typedef char known[sizeof(T) ? 1 : -1]; if (sizeof(known)) delete [] m_ptr; }
+#ifdef LOOSE_OWN_ARRAY_PTR
+ explicit OwnArrayPtr(PtrType ptr) : m_ptr(ptr) { }
+ void set(PtrType);
+#endif
- T* m_ptr;
- };
-
- template <typename T> inline void swap(OwnArrayPtr<T>& a, OwnArrayPtr<T>& b) { a.swap(b); }
+private:
+ PtrType m_ptr;
+};
+
+template<typename T> template<typename U> inline OwnArrayPtr<T>::OwnArrayPtr(const PassOwnArrayPtr<U>& o)
+ : m_ptr(o.leakPtr())
+{
+}
+
+template<typename T> inline void OwnArrayPtr<T>::clear()
+{
+ PtrType ptr = m_ptr;
+ m_ptr = 0;
+ deleteOwnedArrayPtr(ptr);
+}
+
+template<typename T> inline PassOwnArrayPtr<T> OwnArrayPtr<T>::release()
+{
+ PtrType ptr = m_ptr;
+ m_ptr = 0;
+ return adoptArrayPtr(ptr);
+}
+
+template<typename T> inline typename OwnArrayPtr<T>::PtrType OwnArrayPtr<T>::leakPtr()
+{
+ PtrType ptr = m_ptr;
+ m_ptr = 0;
+ return ptr;
+}
+
+#ifdef LOOSE_OWN_ARRAY_PTR
+template<typename T> inline void OwnArrayPtr<T>::set(PtrType ptr)
+{
+ ASSERT(!ptr || m_ptr != ptr);
+ PtrType oldPtr = m_ptr;
+ m_ptr = ptr;
+ deleteOwnedArrayPtr(oldPtr);
+}
+#endif
- template <typename T> inline T* getPtr(const OwnArrayPtr<T>& p)
- {
- return p.get();
- }
+template<typename T> inline OwnArrayPtr<T>& OwnArrayPtr<T>::operator=(const PassOwnArrayPtr<T>& o)
+{
+ PtrType ptr = m_ptr;
+ m_ptr = o.leakPtr();
+ ASSERT(!ptr || m_ptr != ptr);
+ deleteOwnedArrayPtr(ptr);
+ return *this;
+}
+
+template<typename T> template<typename U> inline OwnArrayPtr<T>& OwnArrayPtr<T>::operator=(const PassOwnArrayPtr<U>& o)
+{
+ PtrType ptr = m_ptr;
+ m_ptr = o.leakPtr();
+ ASSERT(!ptr || m_ptr != ptr);
+ deleteOwnedArrayPtr(ptr);
+ return *this;
+}
+
+template <typename T> inline void swap(OwnArrayPtr<T>& a, OwnArrayPtr<T>& b)
+{
+ a.swap(b);
+}
+
+template<typename T, typename U> inline bool operator==(const OwnArrayPtr<T>& a, U* b)
+{
+ return a.get() == b;
+}
+
+template<typename T, typename U> inline bool operator==(T* a, const OwnArrayPtr<U>& b)
+{
+ return a == b.get();
+}
+
+template<typename T, typename U> inline bool operator!=(const OwnArrayPtr<T>& a, U* b)
+{
+ return a.get() != b;
+}
+
+template<typename T, typename U> inline bool operator!=(T* a, const OwnArrayPtr<U>& b)
+{
+ return a != b.get();
+}
+
+template <typename T> inline T* getPtr(const OwnArrayPtr<T>& p)
+{
+ return p.get();
+}
} // namespace WTF
projects / apple / javascriptcore.git / blobdiff