41 lines
1.3 KiB
C
41 lines
1.3 KiB
C
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/*
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* Copyright 2022 The WebRTC project authors. All Rights Reserved.
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*
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* Use of this source code is governed by a BSD-style license
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* that can be found in the LICENSE file in the root of the source
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* tree. An additional intellectual property rights grant can be found
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* in the file PATENTS. All contributing project authors may
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* be found in the AUTHORS file in the root of the source tree.
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*/
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#ifndef RTC_BASE_MEMORY_ALWAYS_VALID_POINTER_H_
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#define RTC_BASE_MEMORY_ALWAYS_VALID_POINTER_H_
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#include <memory>
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namespace webrtc {
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// This template allows the instantiation of a pointer to Interface in such a
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// way that if it is passed a null pointer, an object of class Default will be
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// created, which will be deallocated when the pointer is deleted.
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template <typename Interface, typename Default>
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class AlwaysValidPointer {
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public:
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explicit AlwaysValidPointer(Interface* pointer)
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: owned_instance_(pointer ? nullptr : std::make_unique<Default>()),
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pointer_(pointer ? pointer : owned_instance_.get()) {
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RTC_DCHECK(pointer_);
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}
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Interface* get() { return pointer_; }
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Interface* operator->() { return pointer_; }
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Interface& operator*() { return *pointer_; }
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private:
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const std::unique_ptr<Interface> owned_instance_;
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Interface* const pointer_;
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};
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} // namespace webrtc
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#endif // RTC_BASE_MEMORY_ALWAYS_VALID_POINTER_H_
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