[swift-users] Trouble with function properties

[Saagar Jha]

`Gen` defines `afunc`, but you’re trying to access `aFunc`.

On Wed, Jun 15, 2016 at 6:22 PM Doug Hill via swift-users <
swift-users at swift.org> wrote:

> I’m just starting to learn Swift and attempting to do some
> functional-style programming. Specifically I’m learning how to create
> generic algorithms that can be reused for many different types.
> What I’m attempting to do is create a new object, passing functions to the
> initializer. The class would store these functions as properties and then
> use them for functional-style algorithms.
>
> The problem is I’m running into weird compiler errors/messages that I’m
> trying to figure out. I'm hoping someone here can give me some pointers on
> what these errors mean, and most likely what I’m doing wrong.
>
>   Apple Swift version 2.2 (swiftlang-703.0.18.8 clang-703.0.31) Target:
> x86_64-apple-macosx10.9
>
> // =====================================================================
> class Gen<InputKeyType, InputValueType, OutputKeyType, OutputValueType> {
>     typealias func1Type = (numberRecords:InputKeyType, userRecord:
> InputValueType ) -> (OutputKeyType, OutputValueType)
>
>     var afunc: func1Type
>
>     init( inFunc: func1Type ) {
>         afunc = inFunc
>     }
> }
>
> var g: Gen<Int, (Int, Int), Int, (Int, Int)> =
>     Gen( inFunc: { (numberRecords: Int, userRecord: (Int, Int)) -> (Int, (
> Int, Int)) in
>                 var b: Int = numberRecords
>                 var (age, numFriends) = userRecord
>                 print( (age), (numFriends) )
>                 return (age, (numFriends, 1))
>             }
>     )
> // =====================================================================
>
>
> What I get as output from the Swift compiler are these confusing messages.
> I included some print statements that hopefully gives some more info about
> what’s happening.
>
> g: Gen<Int, (Int, Int), Int, (Int, Int)> = {
>   afunc = 0x00000001012024d0 $__lldb_expr7`partial apply forwarder for
> reabstraction thunk helper from @callee_owned (@unowned Swift.Int, @unowned
> Swift.Int, @unowned Swift.Int) -> (@unowned (Swift.Int, (Swift.Int,
> Swift.Int))) to @callee_owned (@in Swift.Int, @in (Swift.Int, Swift.Int))
> -> (@out (Swift.Int, (Swift.Int, Swift.Int))) at repl6.swift
> }
>
> print( (g) )
> Gen<Swift.Int, (Swift.Int, Swift.Int), Swift.Int, (Swift.Int, Swift.Int)>
>
> print( (g.aFunc) )
> repl.swift:48:9: error: value of type 'Gen<Int, (Int, Int), Int, (Int,
> Int)>' has no member 'aFunc'
>         ^ ~~~~~
>
>
> There’s a good chance I’m doing something wrong but I don’t know how to
> figure out what that problem is. Any ideas?
>
> Thanks.
>
> Doug
> _______________________________________________
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> swift-users at swift.org
> https://lists.swift.org/mailman/listinfo/swift-users
>
-- 
-Saagar Jha
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