1 files changed, 26 insertions, 0 deletions
diff --git a/src/objective-c/RxLibrary/GRXMappingWriter.h b/src/objective-c/RxLibrary/GRXMappingWriter.h
new file mode 100644
index 0000000000..a344f96622
--- /dev/null
+++ b/src/objective-c/RxLibrary/GRXMappingWriter.h
@@ -0,0 +1,26 @@
+/*
+ *
+ * Copyright 2015 gRPC authors.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ *
+ */
+
+#import "RxLibrary/GRXForwardingWriter.h"
+
+/** A "proxy" writer that transforms all the values of its input writer by using a mapping function.
+ */
+@interface GRXMappingWriter : GRXForwardingWriter
+- (instancetype)initWithWriter:(GRXWriter *)writer
+                           map:(id (^)(id value))map NS_DESIGNATED_INITIALIZER;
+@end