base/apple/owned_objc.mm

// Copyright 2023 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

#include "base/apple/owned_objc.h"

#include <Foundation/Foundation.h>

#include "build/build_config.h"

#define OWNED_OBJC_IMPL(classname, objctype, ownership)                       \
  namespace base::apple {                                                     \
  struct classname::ObjCStorage {                                             \
    objctype ownership obj;                                                   \
  };                                                                          \
  classname::classname() : objc_storage_(std::make_unique<ObjCStorage>()) {}  \
  classname::~classname() = default;                                          \
  classname::classname(objctype obj) : classname() {                          \
    objc_storage_->obj = obj;                                                 \
  }                                                                           \
  classname::classname(const classname& other) : classname() {                \
    objc_storage_->obj = other.objc_storage_->obj;                            \
  }                                                                           \
  classname& classname::operator=(const classname& other) {                   \
    objc_storage_->obj = other.objc_storage_->obj;                            \
    return *this;                                                             \
  }                                                                           \
  classname::operator bool() const {                                          \
    return objc_storage_->obj != nil;                                         \
  }                                                                           \
  bool classname::operator==(const classname& other) const {                  \
    return objc_storage_->obj == other.objc_storage_->obj;                    \
  }                                                                           \
  bool classname::operator!=(const classname& other) const {                  \
    return !this->operator==(other);                                          \
  }                                                                           \
  std::string classname::ToString() const {                                   \
    return objc_storage_->obj                                                 \
               ? id<NSObject>(objc_storage_->obj).debugDescription.UTF8String \
               : std::string("<nil>");                                        \
  }                                                                           \
  objctype classname::Get() const {                                           \
    return objc_storage_->obj;                                                \
  }                                                                           \
  }  // namespace base::apple

#define GENERATE_STRONG_OBJC_TYPE(name) \
  OWNED_OBJC_IMPL(Owned##name, name*, __strong)
#define GENERATE_STRONG_OBJC_PROTOCOL(name) \
  OWNED_OBJC_IMPL(Owned##name, id<name>, __strong)
#define GENERATE_WEAK_OBJC_TYPE(name) OWNED_OBJC_IMPL(Weak##name, name*, __weak)
#define GENERATE_WEAK_OBJC_PROTOCOL(name) \
  OWNED_OBJC_IMPL(Weak##name, id<name>, __weak)

#include "base/apple/owned_objc_types.h"

#undef GENERATE_STRONG_OBJC_TYPE
#undef GENERATE_STRONG_OBJC_PROTOCOL
#undef GENERATE_WEAK_OBJC_TYPE
#undef GENERATE_WEAK_OBJC_PROTOCOL
#undef OWNED_OBJC_IMPL