swift: what's type "(AnyObject)"? -

i'm running interesting error message today:

cannot invoke 'map' argument list of type '(anyobject)'

i don't know there type in swift called (anyobject)!

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the context is, i'm using closure callback after http request:

datahandler: ((anyobject) -> ())?, 

and trying implement datahandler in piece of code:

datahandler: { (obj: anyobject) -> () in ...} 

at moment, swift take "obj" type: (anyobject)...

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thanks @sketchytech's inspiring answer, objectmapper seems need concrete type of "anyobject", cast array or dictionary. code works:

    if let dic = res as? [string: anyobject], res = mapper<mappabletype>().map(dic) {         ...     } 

when used concrete type, rather generic type, anyobject enables call objc method (but of course must able respond method @ runtime avoid crashing).

when used concrete type, known @objc methods , properties available, implicitly-unwrapped-optional methods , properties respectively, on each instance of anyobject. (swift header file)

its primary role passing objects between objc , strongly-typed language of swift.

for instance of type anyobject used higher order swift functions must first cast type can applied, e.g.

datahandler: {arr in     if let = arr as? [int] {         a.map{$0+1}     }}