'GPU内核方法优化'

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2023-03-07 8b06b1cbf112d55307ea8a6efe711db4e7506d89

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// Copyright 2014 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 MINI_CHROMIUM_BASE_MAC_SCOPED_TYPEREF_H_
#define MINI_CHROMIUM_BASE_MAC_SCOPED_TYPEREF_H_
 
#include "base/compiler_specific.h"
#include "base/logging.h"
#include "base/memory/scoped_policy.h"
 
namespace base {
 
template <typename T>
struct ScopedTypeRefTraits;
 
template <typename T, typename Traits = ScopedTypeRefTraits<T>>
class ScopedTypeRef {
 public:
  typedef T element_type;
 
  ScopedTypeRef(
      T object = Traits::InvalidValue(),
      base::scoped_policy::OwnershipPolicy policy = base::scoped_policy::ASSUME)
      : object_(object) {
    if (object_ && policy == base::scoped_policy::RETAIN)
      object_ = Traits::Retain(object_);
  }
 
  ScopedTypeRef(const ScopedTypeRef<T, Traits>& that) : object_(that.object_) {
    if (object_)
      object_ = Traits::Retain(object_);
  }
 
  ~ScopedTypeRef() {
    if (object_)
      Traits::Release(object_);
  }
 
  ScopedTypeRef& operator=(const ScopedTypeRef<T, Traits>& that) {
    reset(that.get(), base::scoped_policy::RETAIN);
    return *this;
  }
 
  T* InitializeInto() WARN_UNUSED_RESULT {
    DCHECK(!object_);
    return &object_;
  }
 
  void reset(T object = Traits::InvalidValue(),
             base::scoped_policy::OwnershipPolicy policy =
                 base::scoped_policy::ASSUME) {
    if (object && policy == base::scoped_policy::RETAIN)
      object = Traits::Retain(object);
    if (object_)
      Traits::Release(object_);
    object_ = object;
  }
 
  bool operator==(T that) const { return object_ == that; }
 
  bool operator!=(T that) const { return object_ != that; }
 
  operator T() const { return object_; }
 
  T get() const { return object_; }
 
  void swap(ScopedTypeRef& that) {
    T temp = that.object_;
    that.object_ = object_;
    object_ = temp;
  }
 
  T release() WARN_UNUSED_RESULT {
    T temp = object_;
    object_ = Traits::InvalidValue();
    return temp;
  }
 
 private:
  T object_;
};
 
}  // namespace base
 
#endif  // MINI_CHROMIUM_BASE_MAC_SCOPED_TYPEREF_H_