| // Copyright 2008 Google Inc. 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 |
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| // (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_POINTER_H_ |
| #define V8_SMART_POINTER_H_ |
| |
| namespace v8 { namespace internal { |
| |
| |
| // A 'scoped pointer' that calls delete[] on its pointer when the |
| // destructor is called. |
| template<typename T> |
| class SmartPointer { |
| public: |
| // Construct a scoped pointer from a plain one. |
| inline SmartPointer(T* pointer) : p(pointer) {} |
| |
| |
| // When the destructor of the scoped pointer is executed the plain pointer |
| // is deleted using delete[]. This implies that you must allocate with |
| // new[...], not new(...). |
| inline ~SmartPointer() { if (p) delete [] p; } |
| |
| |
| // Copy constructor removes the pointer from the original to avoid double |
| // freeing. |
| inline SmartPointer(const SmartPointer<T>& rhs) : p(rhs.p) { |
| const_cast<SmartPointer<T>&>(rhs).p = NULL; |
| } |
| |
| |
| // You can get the underlying pointer out with the * operator. |
| inline T* operator*() { return p; } |
| |
| |
| // You can use -> as if it was a plain pointer. |
| inline T* operator->() { return p; } |
| |
| |
| // 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 SmartPointer<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; |
| } |
| |
| |
| // Assignment requires an empty (NULL) SmartPointer as the receiver. Like |
| // the copy constructor it removes the pointer in the original to avoid |
| // double freeing. |
| inline SmartPointer& operator=(const SmartPointer<T>& rhs) { |
| ASSERT(p == NULL); |
| p = rhs.p; |
| const_cast<SmartPointer<T>&>(rhs).p = NULL; |
| return *this; |
| } |
| |
| |
| private: |
| T* p; |
| }; |
| |
| } } // namespace v8::internal |
| |
| #endif // V8_SMART_POINTER_H_ |