mirror of
https://github.com/classilla/tenfourfox.git
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84 lines
2.4 KiB
C++
84 lines
2.4 KiB
C++
/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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/* vim: set ts=8 sts=2 et sw=2 tw=80: */
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/* This code is made available to you under your choice of the following sets
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* of licensing terms:
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*/
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/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/.
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*/
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/* Copyright 2013 Mozilla Contributors
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#ifndef mozilla_pkix_ScopedPtr_h
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#define mozilla_pkix_ScopedPtr_h
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namespace mozilla { namespace pkix {
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// A subset polyfill of std::unique_ptr that does not support move construction
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// or move assignment. This is used instead of std::unique_ptr because some
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// important toolchains still don't provide std::unique_ptr, including in
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// particular Android NDK projects with APP_STL=stlport_static or
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// ALL_STL=stlport_shared.
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template <typename T, void (&Destroyer)(T*)>
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class ScopedPtr final
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{
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public:
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explicit ScopedPtr(T* value = nullptr) : mValue(value) { }
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ScopedPtr(const ScopedPtr&) = delete;
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~ScopedPtr()
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{
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if (mValue) {
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Destroyer(mValue);
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}
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}
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void operator=(const ScopedPtr&) = delete;
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T& operator*() const { return *mValue; }
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T* operator->() const { return mValue; }
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explicit operator bool() const { return mValue; }
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T* get() const { return mValue; }
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T* release()
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{
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T* result = mValue;
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mValue = nullptr;
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return result;
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}
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void reset(T* newValue = nullptr)
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{
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// The C++ standard requires std::unique_ptr to destroy the old value
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// pointed to by mValue, if any, *after* assigning the new value to mValue.
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T* oldValue = mValue;
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mValue = newValue;
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if (oldValue) {
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Destroyer(oldValue);
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}
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}
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private:
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T* mValue;
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};
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} } // namespace mozilla::pkix
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#endif // mozilla_pkix_ScopedPtr_h
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