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-rw-r--r--libc/private/UniquePtr.h140
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diff --git a/libc/private/UniquePtr.h b/libc/private/UniquePtr.h
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--- a/libc/private/UniquePtr.h
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-/*
- * Copyright (C) 2010 The Android Open Source Project
- *
- * Licensed under the Apache License, Version 2.0 (the "License");
- * you may not use this file except in compliance with the License.
- * You may obtain a copy of the License at
- *
- * http://www.apache.org/licenses/LICENSE-2.0
- *
- * Unless required by applicable law or agreed to in writing, software
- * distributed under the License is distributed on an "AS IS" BASIS,
- * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
- * See the License for the specific language governing permissions and
- * limitations under the License.
- */
-
-#ifndef UNIQUE_PTR_H_included
-#define UNIQUE_PTR_H_included
-
-// Default deleter for pointer types.
-template <typename T>
-struct DefaultDelete {
- enum { type_must_be_complete = sizeof(T) };
- DefaultDelete() {}
- void operator()(T* p) const {
- delete p;
- }
-};
-
-// Default deleter for array types.
-template <typename T>
-struct DefaultDelete<T[]> {
- enum { type_must_be_complete = sizeof(T) };
- void operator()(T* p) const {
- delete[] p;
- }
-};
-
-// A smart pointer that deletes the given pointer on destruction.
-// Equivalent to C++0x's std::unique_ptr (a combination of boost::scoped_ptr
-// and boost::scoped_array).
-// Named to be in keeping with Android style but also to avoid
-// collision with any other implementation, until we can switch over
-// to unique_ptr.
-// Use thus:
-// UniquePtr<C> c(new C);
-template <typename T, typename D = DefaultDelete<T> >
-class UniquePtr {
-public:
- // Construct a new UniquePtr, taking ownership of the given raw pointer.
- explicit UniquePtr(T* ptr = nullptr) : mPtr(ptr) { }
-
- UniquePtr(UniquePtr<T, D>&& that) {
- mPtr = that.mPtr;
- that.mPtr = nullptr;
- }
-
- ~UniquePtr() {
- reset();
- }
-
- // Accessors.
- T& operator*() const { return *mPtr; }
- T* operator->() const { return mPtr; }
- T* get() const { return mPtr; }
-
- // Returns the raw pointer and hands over ownership to the caller.
- // The pointer will not be deleted by UniquePtr.
- T* release() __attribute__((warn_unused_result)) {
- T* result = mPtr;
- mPtr = nullptr;
- return result;
- }
-
- // Takes ownership of the given raw pointer.
- // If this smart pointer previously owned a different raw pointer, that
- // raw pointer will be freed.
- void reset(T* ptr = nullptr) {
- if (ptr != mPtr) {
- D()(mPtr);
- mPtr = ptr;
- }
- }
-
-private:
- // The raw pointer.
- T* mPtr;
-
- // Comparing unique pointers is probably a mistake, since they're unique.
- template <typename T2> bool operator==(const UniquePtr<T2>& p) const = delete;
- template <typename T2> bool operator!=(const UniquePtr<T2>& p) const = delete;
-
- // Disallow copy and assignment.
- UniquePtr(const UniquePtr&) = delete;
- void operator=(const UniquePtr&) = delete;
-};
-
-// Partial specialization for array types. Like std::unique_ptr, this removes
-// operator* and operator-> but adds operator[].
-template <typename T, typename D>
-class UniquePtr<T[], D> {
-public:
- explicit UniquePtr(T* ptr = NULL) : mPtr(ptr) {
- }
- UniquePtr(UniquePtr<T, D>&& that) {
- mPtr = that.mPtr;
- that.mPtr = nullptr;
- }
-
- ~UniquePtr() {
- reset();
- }
-
- T& operator[](size_t i) const {
- return mPtr[i];
- }
- T* get() const { return mPtr; }
-
- T* release() __attribute__((warn_unused_result)) {
- T* result = mPtr;
- mPtr = NULL;
- return result;
- }
-
- void reset(T* ptr = NULL) {
- if (ptr != mPtr) {
- D()(mPtr);
- mPtr = ptr;
- }
- }
-
-private:
- T* mPtr;
-
- // Disallow copy and assignment.
- UniquePtr(const UniquePtr&) = delete;
- void operator=(const UniquePtr&) = delete;
-};
-
-#endif // UNIQUE_PTR_H_included