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// Copyright (c) 2016 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifndef NET_THIRD_PARTY_QUICHE_OVERRIDES_QUICHE_PLATFORM_IMPL_QUICHE_REFERENCE_COUNTED_IMPL_H_
#define NET_THIRD_PARTY_QUICHE_OVERRIDES_QUICHE_PLATFORM_IMPL_QUICHE_REFERENCE_COUNTED_IMPL_H_
#include "base/memory/ref_counted.h"
#include "net/third_party/quiche/src/quiche/quic/platform/api/quic_export.h"
namespace quiche {
class QUIC_EXPORT_PRIVATE QuicheReferenceCountedImpl
: public base::RefCountedThreadSafe<QuicheReferenceCountedImpl> {
public:
QuicheReferenceCountedImpl() = default;
protected:
virtual ~QuicheReferenceCountedImpl() = default;
private:
friend class base::RefCountedThreadSafe<QuicheReferenceCountedImpl>;
};
template <class T>
class QuicheReferenceCountedPointerImpl {
public:
QuicheReferenceCountedPointerImpl() = default;
// Constructor from raw pointer |p|. This guarantees that the reference count
// of *p is 1. This should be only called when a new object is created,
// calling this on an already existent object does not increase its reference
// count.
explicit QuicheReferenceCountedPointerImpl(T* p) : refptr_(p) {}
// Allows implicit conversion from nullptr.
QuicheReferenceCountedPointerImpl(std::nullptr_t) // NOLINT
: refptr_(nullptr) {}
// Copy and copy conversion constructors. It does not take the reference away
// from |other| and they each end up with their own reference.
template <typename U>
QuicheReferenceCountedPointerImpl( // NOLINT
const QuicheReferenceCountedPointerImpl<U>& other)
: refptr_(other.refptr()) {}
QuicheReferenceCountedPointerImpl(
const QuicheReferenceCountedPointerImpl& other)
: refptr_(other.refptr()) {}
// Move constructors. After move, it adopts the reference from |other|.
template <typename U>
QuicheReferenceCountedPointerImpl( // NOLINT
QuicheReferenceCountedPointerImpl<U>&& other)
: refptr_(std::move(other.refptr())) {}
QuicheReferenceCountedPointerImpl(QuicheReferenceCountedPointerImpl&& other)
: refptr_(std::move(other.refptr())) {}
~QuicheReferenceCountedPointerImpl() = default;
// Copy assignments.
QuicheReferenceCountedPointerImpl& operator=(
const QuicheReferenceCountedPointerImpl& other) {
refptr_ = other.refptr();
return *this;
}
template <typename U>
QuicheReferenceCountedPointerImpl<T>& operator=(
const QuicheReferenceCountedPointerImpl<U>& other) {
refptr_ = other.refptr();
return *this;
}
// Move assignments.
QuicheReferenceCountedPointerImpl& operator=(
QuicheReferenceCountedPointerImpl&& other) {
refptr_ = std::move(other.refptr());
return *this;
}
template <typename U>
QuicheReferenceCountedPointerImpl<T>& operator=(
QuicheReferenceCountedPointerImpl<U>&& other) {
refptr_ = std::move(other.refptr());
return *this;
}
explicit operator bool() const { return static_cast<bool>(refptr_); }
// Assignment operator on raw pointer. Drops a reference to current pointee,
// if any, and replaces it with |p|. This guarantees that the reference count
// of *p is 1. This should only be used when a new object is created. Calling
// this on an already existent object is undefined behavior according to the
// API contract (even though the underlying implementation might have a
// well-defined behavior).
QuicheReferenceCountedPointerImpl<T>& operator=(T* p) {
refptr_ = p;
return *this;
}
// Returns the raw pointer with no change in reference count.
T* get() const { return refptr_.get(); }
// Accessors for the referenced object.
// operator*() and operator->() will assert() if there is no current object.
T& operator*() const { return *refptr_; }
T* operator->() const {
assert(refptr_ != nullptr);
return refptr_.get();
}
scoped_refptr<T>& refptr() { return refptr_; }
const scoped_refptr<T>& refptr() const { return refptr_; }
private:
scoped_refptr<T> refptr_;
};
} // namespace quiche
#endif // NET_THIRD_PARTY_QUICHE_OVERRIDES_QUICHE_PLATFORM_IMPL_QUICHE_REFERENCE_COUNTED_IMPL_H_
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