Swift Generic parameter 'T' could not be inferred - swift

Question

I have a generic dictionary, and built a generic function to access that dictionary (to prevent concurrency access problems).
My (singleton) data class looks like:
class AppData {
static let genericDict: Dictionary<String, Any> = [:]
static func genericGet<T: Any>(_ objID: String) -> T {
let retVal: T
mySemaphore.wait()
retVal = genericDict[objID] as! T
mySemaphore.signal()
return retVal
}
}
However, when I call my function like so:
class SomeClass {
let product: SomeObj = AppData.genericGet(objID) as! SomeObj
}
I get the error:
Generic parameter 'T' could not be inferred
I both explicitly and implicitly cast the type to my desired value. Not sure what else I can do to fix this issue.
I've tried restarting XCode, does not help.
The real code:
public class AppData: ObservableObject {
static private var dataDirectory: Dictionary<String, Any> = Dictionary(minimumCapacity: 10000)
static let dataGetLock = DispatchSemaphore(value: 1)
static func get<T: Any>(_ objID: String) -> T? {
let retVal: T
dataGetLock.wait()
retVal = dataDirectory[objID] as! T
dataGetLock.signal()
return retVal
}
}
I get the error on the following two lines:
class StoreViewEnvironment: ObservableObject {
func initProductLoad(storeID: String) {
...
let liveStore: Store = AppData.get(storeID) as! Store
let liveMenu: Menu = AppData.get(liveStore.menuID) as! Menu
...
}
}

Answer 1

I don't approve of the way you're doing this (on the general grounds that Any is just about always a bad smell), but here's a version that compiles (just delete the Any constraint):
class AppData {
static let genericDict: Dictionary<String, Any> = [:]
static func get<T>(_ objID: String) -> T {
let retVal: T
retVal = genericDict[objID] as! T
return retVal
}
}
class SomeClass {
let product : String = AppData.get("yoho")
}