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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