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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.
+
+#ifndef GOOGLE_PROTOBUF_STUBS_SCOPED_PTR_H_
+#define GOOGLE_PROTOBUF_STUBS_SCOPED_PTR_H_
+
+#include <google/protobuf/stubs/port.h>
+
+namespace google {
+namespace protobuf {
+
+// ===================================================================
+// from google3/base/scoped_ptr.h
+
+namespace internal {
+
+// This is an implementation designed to match the anticipated future TR2
+// implementation of the scoped_ptr class, and its closely-related brethren,
+// scoped_array, scoped_ptr_malloc, and make_scoped_ptr.
+
+template <class C> class scoped_ptr;
+template <class C> class scoped_array;
+
+// A scoped_ptr<T> is like a T*, except that the destructor of scoped_ptr<T>
+// automatically deletes the pointer it holds (if any).
+// That is, scoped_ptr<T> owns the T object that it points to.
+// Like a T*, a scoped_ptr<T> may hold either NULL or a pointer to a T object.
+//
+// The size of a scoped_ptr is small:
+// sizeof(scoped_ptr<C>) == sizeof(C*)
+template <class C>
+class scoped_ptr {
+ public:
+
+ // The element type
+ typedef C element_type;
+
+ // Constructor. Defaults to initializing with NULL.
+ // There is no way to create an uninitialized scoped_ptr.
+ // The input parameter must be allocated with new.
+ explicit scoped_ptr(C* p = NULL) : ptr_(p) { }
+
+ // Destructor. If there is a C object, delete it.
+ // We don't need to test ptr_ == NULL because C++ does that for us.
+ ~scoped_ptr() {
+ enum { type_must_be_complete = sizeof(C) };
+ delete ptr_;
+ }
+
+ // Reset. Deletes the current owned object, if any.
+ // Then takes ownership of a new object, if given.
+ // this->reset(this->get()) works.
+ void reset(C* p = NULL) {
+ if (p != ptr_) {
+ enum { type_must_be_complete = sizeof(C) };
+ delete ptr_;
+ ptr_ = p;
+ }
+ }
+
+ // Accessors to get the owned object.
+ // operator* and operator-> will assert() if there is no current object.
+ C& operator*() const {
+ assert(ptr_ != NULL);
+ return *ptr_;
+ }
+ C* operator->() const {
+ assert(ptr_ != NULL);
+ return ptr_;
+ }
+ C* get() const { return ptr_; }
+
+ // Comparison operators.
+ // These return whether two scoped_ptr refer to the same object, not just to
+ // two different but equal objects.
+ bool operator==(C* p) const { return ptr_ == p; }
+ bool operator!=(C* p) const { return ptr_ != p; }
+
+ // Swap two scoped pointers.
+ void swap(scoped_ptr& p2) {
+ C* tmp = ptr_;
+ ptr_ = p2.ptr_;
+ p2.ptr_ = tmp;
+ }
+
+ // Release a pointer.
+ // The return value is the current pointer held by this object.
+ // If this object holds a NULL pointer, the return value is NULL.
+ // After this operation, this object will hold a NULL pointer,
+ // and will not own the object any more.
+ C* release() {
+ C* retVal = ptr_;
+ ptr_ = NULL;
+ return retVal;
+ }
+
+ private:
+ C* ptr_;
+
+ // Forbid comparison of scoped_ptr types. If C2 != C, it totally doesn't
+ // make sense, and if C2 == C, it still doesn't make sense because you should
+ // never have the same object owned by two different scoped_ptrs.
+ template <class C2> bool operator==(scoped_ptr<C2> const& p2) const;
+ template <class C2> bool operator!=(scoped_ptr<C2> const& p2) const;
+
+ // Disallow evil constructors
+ scoped_ptr(const scoped_ptr&);
+ void operator=(const scoped_ptr&);
+};
+
+// scoped_array<C> is like scoped_ptr<C>, except that the caller must allocate
+// with new [] and the destructor deletes objects with delete [].
+//
+// As with scoped_ptr<C>, a scoped_array<C> either points to an object
+// or is NULL. A scoped_array<C> owns the object that it points to.
+//
+// Size: sizeof(scoped_array<C>) == sizeof(C*)
+template <class C>
+class scoped_array {
+ public:
+
+ // The element type
+ typedef C element_type;
+
+ // Constructor. Defaults to initializing with NULL.
+ // There is no way to create an uninitialized scoped_array.
+ // The input parameter must be allocated with new [].
+ explicit scoped_array(C* p = NULL) : array_(p) { }
+
+ // Destructor. If there is a C object, delete it.
+ // We don't need to test ptr_ == NULL because C++ does that for us.
+ ~scoped_array() {
+ enum { type_must_be_complete = sizeof(C) };
+ delete[] array_;
+ }
+
+ // Reset. Deletes the current owned object, if any.
+ // Then takes ownership of a new object, if given.
+ // this->reset(this->get()) works.
+ void reset(C* p = NULL) {
+ if (p != array_) {
+ enum { type_must_be_complete = sizeof(C) };
+ delete[] array_;
+ array_ = p;
+ }
+ }
+
+ // Get one element of the current object.
+ // Will assert() if there is no current object, or index i is negative.
+ C& operator[](std::ptrdiff_t i) const {
+ assert(i >= 0);
+ assert(array_ != NULL);
+ return array_[i];
+ }
+
+ // Get a pointer to the zeroth element of the current object.
+ // If there is no current object, return NULL.
+ C* get() const {
+ return array_;
+ }
+
+ // Comparison operators.
+ // These return whether two scoped_array refer to the same object, not just to
+ // two different but equal objects.
+ bool operator==(C* p) const { return array_ == p; }
+ bool operator!=(C* p) const { return array_ != p; }
+
+ // Swap two scoped arrays.
+ void swap(scoped_array& p2) {
+ C* tmp = array_;
+ array_ = p2.array_;
+ p2.array_ = tmp;
+ }
+
+ // Release an array.
+ // The return value is the current pointer held by this object.
+ // If this object holds a NULL pointer, the return value is NULL.
+ // After this operation, this object will hold a NULL pointer,
+ // and will not own the object any more.
+ C* release() {
+ C* retVal = array_;
+ array_ = NULL;
+ return retVal;
+ }
+
+ private:
+ C* array_;
+
+ // Forbid comparison of different scoped_array types.
+ template <class C2> bool operator==(scoped_array<C2> const& p2) const;
+ template <class C2> bool operator!=(scoped_array<C2> const& p2) const;
+
+ // Disallow evil constructors
+ scoped_array(const scoped_array&);
+ void operator=(const scoped_array&);
+};
+
+} // namespace internal
+
+// We made these internal so that they would show up as such in the docs,
+// but we don't want to stick "internal::" in front of them everywhere.
+using internal::scoped_ptr;
+using internal::scoped_array;
+
+
+} // namespace protobuf
+} // namespace google
+
+#endif // GOOGLE_PROTOBUF_STUBS_SCOPED_PTR_H_