cf_utils.h

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// Copyright 2013 The Flutter 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 FLUTTER_FML_PLATFORM_DARWIN_CF_UTILS_H_
#define FLUTTER_FML_PLATFORM_DARWIN_CF_UTILS_H_
 
#include <CoreFoundation/CoreFoundation.h>
 
#include "flutter/fml/macros.h"
 
namespace fml {
 
template <class T>
class CFRef {
 public:
  CFRef() : instance_(nullptr) {}
 
  // NOLINTNEXTLINE(google-explicit-constructor)
  CFRef(T instance) : instance_(instance) {}
 
  CFRef(const CFRef& other) : instance_(other.instance_) {
    if (instance_) {
      CFRetain(instance_);
    }
  }
 
  CFRef(CFRef&& other) : instance_(other.instance_) {
    other.instance_ = nullptr;
  }
 
  CFRef& operator=(CFRef&& other) {
    Reset(other.Release());
    return *this;
  }
 
  ~CFRef() {
    if (instance_ != nullptr) {
      CFRelease(instance_);
    }
    instance_ = nullptr;
  }
 
  void Reset(T instance = nullptr) {
    if (instance_ != nullptr) {
      CFRelease(instance_);
    }
 
    instance_ = instance;
  }
 
  [[nodiscard]] T Release() {
    auto instance = instance_;
    instance_ = nullptr;
    return instance;
  }
 
  // NOLINTNEXTLINE(google-explicit-constructor)
  operator T() const { return instance_; }
 
  explicit operator bool() const { return instance_ != nullptr; }
 
 private:
  T instance_;
 
  CFRef& operator=(const CFRef&) = delete;
};
 
}  // namespace fml
 
#endif  // FLUTTER_FML_PLATFORM_DARWIN_CF_UTILS_H_