19 #import <Foundation/Foundation.h>
24 typedef NS_ENUM(NSInteger, GRXWriterState) {
32 GRXWriterStateNotStarted,
35 GRXWriterStateStarted,
51 GRXWriterStateFinished
97 - (void)startWithWriteable:(id<GRXWriteable>)writeable;
105 - (void)finishWithError:(NSError *)errorOrNil;