- (instancetype)initWithRequest:(NSURLRequest *)request
                        options:(YYWebImageOptions)options
                          cache:(nullable YYImageCache *)cache
                       cacheKey:(nullable NSString *)cacheKey
                       progress:(nullable YYWebImageProgressBlock)progress
                      transform:(nullable YYWebImageTransformBlock)transform
                     completion:(nullable YYWebImageCompletionBlock)completion NS_DESIGNATED_INITIALIZER;

- (instancetype)init UNAVAILABLE_ATTRIBUTE;
+ (instancetype)new UNAVAILABLE_ATTRIBUTE;


- (instancetype)init {
    @throw [NSException exceptionWithName:@"YYWebImageOperation init error" reason:@"YYWebImageOperation must be initialized with a request. Use the designated initializer to init." userInfo:nil];
    return [self initWithRequest:[NSURLRequest requestWithURL:[NSURL URLWithString:@""]] options:0 cache:nil cacheKey:nil progress:nil transform:nil completion:nil];
}

- (instancetype)initWithRequest:(NSURLRequest *)request
                        options:(YYWebImageOptions)options
                          cache:(YYImageCache *)cache
                       cacheKey:(NSString *)cacheKey
                       progress:(YYWebImageProgressBlock)progress
                      transform:(YYWebImageTransformBlock)transform
                     completion:(YYWebImageCompletionBlock)completion {
                     }