imp_implementationWithBlock()
In particular,
imp_implementationWithBlock()takes a block as a parameter, copies it to the heap, and returns a trampoline that allows the block to be used as the implementation — theIMP— of a method in any Objective-C class (as long as the block’s arguments and the method’s arguments are compatible).
Most code will never need this, but in rare cases it will be incredibly useful. Currently iOS-only, unfortunately.
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Happy to see that it's now available in Mac OS X Lion.
[...] Fuller explains Apple’s implementation of imp_implementationWithBlock() and posted his own PLBlockIMP, which works on Mac OS X 10.6: On Darwin, vm_remap() provides support [...]