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-// Copyright 2011 the V8 project authors. All rights reserved.
-// Redistribution and use in source and binary forms, with or without
-// modification, are permitted provided that the following conditions are
-// met:
-//
-// * Redistributions of source code must retain the above copyright
-// notice, this list of conditions and the following disclaimer.
-// * Redistributions in binary form must reproduce the above
-// copyright notice, this list of conditions and the following
-// disclaimer in the documentation and/or other materials provided
-// with the distribution.
-// * Neither the name of Google Inc. nor the names of its
-// contributors may be used to endorse or promote products derived
-// from this software without specific prior written permission.
-//
-// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
-// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
-// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
-// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
-// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
-// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
-// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
-// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
-// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
-// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
-// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
-
-#ifndef V8_SMART_POINTERS_H_
-#define V8_SMART_POINTERS_H_
-
-namespace v8 {
-namespace internal {
-
-
-template<typename Deallocator, typename T>
-class SmartPointerBase {
- public:
- // Default constructor. Constructs an empty scoped pointer.
- inline SmartPointerBase() : p_(NULL) {}
-
- // Constructs a scoped pointer from a plain one.
- explicit inline SmartPointerBase(T* ptr) : p_(ptr) {}
-
- // Copy constructor removes the pointer from the original to avoid double
- // freeing.
- inline SmartPointerBase(const SmartPointerBase<Deallocator, T>& rhs)
- : p_(rhs.p_) {
- const_cast<SmartPointerBase<Deallocator, T>&>(rhs).p_ = NULL;
- }
-
- // When the destructor of the scoped pointer is executed the plain pointer
- // is deleted using DeleteArray. This implies that you must allocate with
- // NewArray.
- inline ~SmartPointerBase() { if (p_) Deallocator::Delete(p_); }
-
- inline T* operator->() const { return p_; }
-
- // You can get the underlying pointer out with the * operator.
- inline T* operator*() { return p_; }
-
- // You can use [n] to index as if it was a plain pointer.
- inline T& operator[](size_t i) {
- return p_[i];
- }
-
- // You can use [n] to index as if it was a plain pointer.
- const inline T& operator[](size_t i) const {
- return p_[i];
- }
-
- // We don't have implicit conversion to a T* since that hinders migration:
- // You would not be able to change a method from returning a T* to
- // returning an SmartArrayPointer<T> and then get errors wherever it is used.
-
-
- // If you want to take out the plain pointer and don't want it automatically
- // deleted then call Detach(). Afterwards, the smart pointer is empty
- // (NULL).
- inline T* Detach() {
- T* temp = p_;
- p_ = NULL;
- return temp;
- }
-
- inline void Reset(T* new_value) {
- if (p_) Deallocator::Delete(p_);
- p_ = new_value;
- }
-
- // Assignment requires an empty (NULL) SmartArrayPointer as the receiver. Like
- // the copy constructor it removes the pointer in the original to avoid
- // double freeing.
- inline SmartPointerBase<Deallocator, T>& operator=(
- const SmartPointerBase<Deallocator, T>& rhs) {
- ASSERT(is_empty());
- T* tmp = rhs.p_; // swap to handle self-assignment
- const_cast<SmartPointerBase<Deallocator, T>&>(rhs).p_ = NULL;
- p_ = tmp;
- return *this;
- }
-
- inline bool is_empty() { return p_ == NULL; }
-
- private:
- T* p_;
-};
-
-// A 'scoped array pointer' that calls DeleteArray on its pointer when the
-// destructor is called.
-
-template<typename T>
-struct ArrayDeallocator {
- static void Delete(T* array) {
- DeleteArray(array);
- }
-};
-
-
-template<typename T>
-class SmartArrayPointer: public SmartPointerBase<ArrayDeallocator<T>, T> {
- public:
- inline SmartArrayPointer() { }
- explicit inline SmartArrayPointer(T* ptr)
- : SmartPointerBase<ArrayDeallocator<T>, T>(ptr) { }
- inline SmartArrayPointer(const SmartArrayPointer<T>& rhs)
- : SmartPointerBase<ArrayDeallocator<T>, T>(rhs) { }
-};
-
-
-template<typename T>
-struct ObjectDeallocator {
- static void Delete(T* array) {
- Malloced::Delete(array);
- }
-};
-
-template<typename T>
-class SmartPointer: public SmartPointerBase<ObjectDeallocator<T>, T> {
- public:
- inline SmartPointer() { }
- explicit inline SmartPointer(T* ptr)
- : SmartPointerBase<ObjectDeallocator<T>, T>(ptr) { }
- inline SmartPointer(const SmartPointer<T>& rhs)
- : SmartPointerBase<ObjectDeallocator<T>, T>(rhs) { }
-};
-
-} } // namespace v8::internal
-
-#endif // V8_SMART_POINTERS_H_