Cannot get IMP from objc block (missing block_getImplementation(NSBlock block))

Originator:satsumac
Number:rdar://10097262 Date Originated:2011/11/09
Status:Closed Resolved:yes
Product:Mac OS X SDK Product Version:
Classification:Enhancement Reproducible:
 
Summary:

There should be a way to obtain an IMP from an NSBlock.
In an analgous manner as 
"IMP method_getImplementation(Method method)" (http://developer.apple.com/library/mac/documentation/Cocoa/Reference/ObjCRuntimeRef/Reference/reference.html#//apple_ref/c/func/method_getImplementation).

This would allow us to do something like this:
"method_setImplementation(myMethod, block_getImplementation(myBlock));"
Or in english: Replace implementation of method X with implementation of block Y.

This would of course require the block and method to have the same return type as well as the same order and types of arguments (plus self & _cmd).

The implementation of a method like "- (BOOL)foo:(Foo *)foo;" could then be replaced with the implementation of a block like "BOOL(^)(id self, SEL _cmd, Foo *)".

Notes:
Being an Objective-C runtime feature request his also relates to the iOS SDK.

Comments

Thanks, found it myself today, by accident. It's still lacking public documentation apparently.

By satsumac at Sept. 17, 2011, 10:25 a.m. (reply...)

http://www.friday.com/bbum/2011/03/17/ios-4-3-imp_implementationwithblock/

By jediknil at Sept. 9, 2011, 2:16 a.m. (reply...)

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