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// Protocol Buffers - Google's data interchange format // Copyright 2008 Google Inc. All rights reserved. // https://developers.google.com/protocol-buffers/ // // 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. // Author: [email protected] (Johan Tibell) #ifndef GOOGLE_PROTOBUF_PYTHON_CPP_SCOPED_PYOBJECT_PTR_H__ #define GOOGLE_PROTOBUF_PYTHON_CPP_SCOPED_PYOBJECT_PTR_H__ #include <google/protobuf/stubs/common.h> #include <Python.h> namespace google { namespace protobuf { namespace python { // Owns a python object and decrements the reference count on destruction. // This class is not threadsafe. template <typename PyObjectStruct> class ScopedPythonPtr { public: // Takes the ownership of the specified object to ScopedPythonPtr. // The reference count of the specified py_object is not incremented. explicit ScopedPythonPtr(PyObjectStruct* py_object = NULL) : ptr_(py_object) {} // If a PyObject is owned, decrement its reference count. ~ScopedPythonPtr() { Py_XDECREF(ptr_); } // Deletes the current owned object, if any. // Then takes ownership of a new object without incrementing the reference // count. // This function must be called with a reference that you own. // this->reset(this->get()) is wrong! // this->reset(this->release()) is OK. PyObjectStruct* reset(PyObjectStruct* p = NULL) { Py_XDECREF(ptr_); ptr_ = p; return ptr_; } // Releases ownership of the object without decrementing the reference count. // The caller now owns the returned reference. PyObjectStruct* release() { PyObject* p = ptr_; ptr_ = NULL; return p; } PyObjectStruct* operator->() const { assert(ptr_ != NULL); return ptr_; } PyObjectStruct* get() const { return ptr_; } PyObject* as_pyobject() const { return reinterpret_cast<PyObject*>(ptr_); } // Increments the reference count fo the current object. // Should not be called when no object is held. void inc() const { Py_INCREF(ptr_); } // True when a ScopedPyObjectPtr and a raw pointer refer to the same object. // Comparison operators are non reflexive. bool operator==(const PyObjectStruct* p) const { return ptr_ == p; } bool operator!=(const PyObjectStruct* p) const { return ptr_ != p; } private: PyObjectStruct* ptr_; GOOGLE_DISALLOW_EVIL_CONSTRUCTORS(ScopedPythonPtr); }; typedef ScopedPythonPtr<PyObject> ScopedPyObjectPtr; } // namespace python } // namespace protobuf } // namespace google #endif // GOOGLE_PROTOBUF_PYTHON_CPP_SCOPED_PYOBJECT_PTR_H__