ios - why does swift dictionary with function work outside of a class but produces error inside of a class? -

ios - why does swift dictionary with function work outside of a class but produces error inside of a class? -

i came across issue (and playground able locate it)

i seek utilize dictionary, has numbers keys , functions values. works fine outside of class:

private func hello1(x: double) { println("hello1") } private func hello2(x: double) { println("hello2") } private allow contacts: [int: double -> ()] = [ 0 : hello1, 1 : hello2 ] contacts[1]?(1.0) // works fine :-)

when set identical code within class, compiler error

'double' not subtype of 'someclass'

with identical code:

internal class someclass { private func hello1(x: double) { println("hello1") } private func hello2(x: double) { println("hello2") } private allow contacts: [int: double -> ()] = [ // *** here error *** 0 : hello1, 1 : hello2 ] internal func runit() { contacts[1]?(1.0) } } allow someclass = someclass() someclass.runit()

i tried several ways of brackets. no improvements.

what did missed when learning swift? did misunderstand or misinterpret?

hello1 , hello2 instance method. if referenced someclass.hello1, type someclass -> (double) -> (). can phone call this:

var foo = someclass() someclass.hello1(foo)(1.0)

it's curried function. , why got error 'double' not subtype of 'someclass'.

if want want, should this:

internal class someclass { private func hello1(x: double) { println("hello1") } private func hello2(x: double) { println("hello2") } lazy private var contacts: [int: double -> ()] = [ 0 : self.hello1, 1 : self.hello2 ] internal func runit() { contacts[1]?(1.0) } }

you have utilize lazy var instead of let, or cannot reference self.

added:

above code makes strong reference cycles. should utilize closures [unowned self].

lazy private var contacts: [int: double -> ()] = [ 0 : {[unowned self] in self.hello1($0) }, 1 : {[unowned self] in self.hello2($0) } ]

ios xcode osx swift