Update GRXWriter.m
Corrected compiler warning for effectively pure virtual ObjC methods.
diff --git a/src/objective-c/RxLibrary/GRXWriter.m b/src/objective-c/RxLibrary/GRXWriter.m
index 019fcbd..fee33f5 100644
--- a/src/objective-c/RxLibrary/GRXWriter.m
+++ b/src/objective-c/RxLibrary/GRXWriter.m
@@ -35,4 +35,14 @@
@implementation GRXWriter
+- (void)startWithWriteable:(id<GRXWriteable>)writeable {
+ NSAssert(NO, @"Missing base implementation for %@", NSStringFromSelector(_cmd));
+ [self doesNotRecognizeSelector:_cmd];
+}
+
+- (void)finishWithError:(NSError *)errorOrNil {
+ NSAssert(NO, @"Missing base implementation for %@", NSStringFromSelector(_cmd));
+ [self doesNotRecognizeSelector:_cmd];
+}
+
@end