Objective-C blocks variable parameters mismatch definition

Question

Why does the compiler allow the line below without errors or warnings? It seems that it should complain about the parameter mismatch in the "onSuccess" declaration and the definition.

I'm using Xcode 4.6 (LLVM 4.2)

void (^onSuccess)() = ^(AFHTTPRequestOperation *operation, id responseObject) {
};

Shows us the original typedef.

CodaFi
– CodaFi

2013-02-06 02:30:05 +00:00
Commented Feb 6, 2013 at 2:30 — CodaFi
– CodaFi, Commented Feb 6, 2013 at 2:30

Sebastian · Accepted Answer · 2013-02-06 03:34:52Z

2

This seems to work just like C function declarations. To Quote from the C99 standard:

(6.7.5.3/14) [...]The empty list in a function declarator that is not part of a definition of that function specifies that no information about the number or types of the parameters is supplied.[...]

Meaning, you can declare a function (and as it seems also a block) and not provide any information about parameters.

answered Feb 6, 2013 at 3:34

Sebastian

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2 Comments

user1432746 Over a year ago

Nearly a duplicate of stackoverflow.com/questions/13950642/…

user1432746 Over a year ago

Also nearly a duplicate of stackoverflow.com/questions/5075530/…

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