Incompatible block pointer types using typedef

Question

For a day now I've been trying to get a piece of code working to help me handle find-and-create for CoreData in a nice way (from this article I found http://emplementation.blogspot.nl/2011/12/importing-data-into-core-data-while.html). I ended up working with code blocks which I've never done before.

Somehow I can't fix the following error which occurs because something is different in my typedef from what I try to define in my function. I think I understand it has something to do with the block being defined as __strong in the typedef but differently in my implementation file.

Error

Incompatible block pointer types initializing '_strong objectOperationBlock' (aka 'void (^_strong)(NSManagedObjectContext *_strong, NSDictionary *_strong, NSManagedObject *_strong)') with an expression of type 'void (^)(NSManagedObject *_strong, NSDictionary *_strong, NSManagedObject *_strong)'

MyViewController.h

typedef void (^objectOperationBlock)(NSManagedObjectContext *context,
                                 NSDictionary *hostObjectData,
                                 NSManagedObject *localManagedObject);

MyViewController.m

objectOperationBlock matchedBlock = ^(NSManagedObject *context, NSDictionary *hostObjectData, NSManagedObject *localManagedObject){
    NSLog(@"Dosomething");
};

In all my attempts I've found out that this could will build (but it's not using the typedef)

void (^matchedBlock)(NSManagedObject*, NSDictionary*, NSManagedObject*) = ^(NSManagedObject *context, NSDictionary *hostObjectData, NSManagedObject *localManagedObject){
    NSLog(@"Dosomething");
};

Thanks in advance for all your help!

Cannot repeat this issue. Could you elaborate?

Richard J. Ross III
– Richard J. Ross III

2012-06-07 13:26:50 +00:00
Commented Jun 7, 2012 at 13:26 — Richard J. Ross III
– Richard J. Ross III, Commented Jun 7, 2012 at 13:26

petert · Accepted Answer · 2012-06-07 13:28:05Z

2

Did I miss that the typedef should read:

typedef void (^objectOperationBlock)(NSManagedObject *managedObject,
                                     NSDictionary *hostObjectData,
                                     NSManagedObject *localManagedObject);

answered Jun 7, 2012 at 13:28

petert

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3 Comments

Phillip Mills Over a year ago

Or, conversely, that the context variable in the assignment should be NSManagedObjectContext.

Kay Lucas Over a year ago

You are very right, no wonder it didn't work.. Thanks a lot, I need to get myself some fresh air!

petert Over a year ago

Easy miss - I've been staring at 10 year old Makefiles all morning (don't ask!), just spotted omission.

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