зеркало из https://github.com/mozilla/gecko-dev.git
84 строки
2.4 KiB
C++
84 строки
2.4 KiB
C++
/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
|
|
/* vim: set ts=8 sts=2 et sw=2 tw=80: */
|
|
/* This code is made available to you under your choice of the following sets
|
|
* of licensing terms:
|
|
*/
|
|
/* This Source Code Form is subject to the terms of the Mozilla Public
|
|
* License, v. 2.0. If a copy of the MPL was not distributed with this
|
|
* file, You can obtain one at http://mozilla.org/MPL/2.0/.
|
|
*/
|
|
/* Copyright 2013 Mozilla Contributors
|
|
*
|
|
* 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 mozilla_pkix_ScopedPtr_h
|
|
#define mozilla_pkix_ScopedPtr_h
|
|
|
|
namespace mozilla { namespace pkix {
|
|
|
|
// A subset polyfill of std::unique_ptr that does not support move construction
|
|
// or move assignment. This is used instead of std::unique_ptr because some
|
|
// important toolchains still don't provide std::unique_ptr, including in
|
|
// particular Android NDK projects with APP_STL=stlport_static or
|
|
// ALL_STL=stlport_shared.
|
|
template <typename T, void (&Destroyer)(T*)>
|
|
class ScopedPtr final
|
|
{
|
|
public:
|
|
explicit ScopedPtr(T* value = nullptr) : mValue(value) { }
|
|
|
|
ScopedPtr(const ScopedPtr&) = delete;
|
|
|
|
~ScopedPtr()
|
|
{
|
|
if (mValue) {
|
|
Destroyer(mValue);
|
|
}
|
|
}
|
|
|
|
void operator=(const ScopedPtr&) = delete;
|
|
|
|
T& operator*() const { return *mValue; }
|
|
T* operator->() const { return mValue; }
|
|
|
|
explicit operator bool() const { return mValue; }
|
|
|
|
T* get() const { return mValue; }
|
|
|
|
T* release()
|
|
{
|
|
T* result = mValue;
|
|
mValue = nullptr;
|
|
return result;
|
|
}
|
|
|
|
void reset(T* newValue = nullptr)
|
|
{
|
|
// The C++ standard requires std::unique_ptr to destroy the old value
|
|
// pointed to by mValue, if any, *after* assigning the new value to mValue.
|
|
T* oldValue = mValue;
|
|
mValue = newValue;
|
|
if (oldValue) {
|
|
Destroyer(oldValue);
|
|
}
|
|
}
|
|
|
|
private:
|
|
T* mValue;
|
|
};
|
|
|
|
} } // namespace mozilla::pkix
|
|
|
|
#endif // mozilla_pkix_ScopedPtr_h
|