protobuf/objectivec/GPBExtensionRegistry.h

// Protocol Buffers - Google's data interchange format
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#import <Foundation/Foundation.h>

@class GPBDescriptor;
@class GPBExtensionField;

// A table of known extensions, searchable by name or field number.  When
// parsing a protocol message that might have extensions, you must provide an
// ExtensionRegistry in which you have registered any extensions that you want
// to be able to parse.  Otherwise, those extensions will just be treated like
// unknown fields.
@interface GPBExtensionRegistry : NSObject

- (GPBExtensionField *)getExtension:(GPBDescriptor *)containingType
                        fieldNumber:(NSInteger)fieldNumber;

@end