example.swift

protocol Revisionable {
    
}

class RealType: Revisionable {
    
}



func setMyRealStuffRevision(entity name: String) -> [(RealType,Int)] {
    return setThingRevision(entity: name)
}

func setThingRevision<GenericType:Revisionable>(entity name: String) -> [(GenericType,Int)] {
    var resultArray = [(GenericType,Int)]()
    
    // Here name contains the name of a Core Data entity and getArrayFromEntity is
    // a local function, extracting an array from the contents of the entity.
    for item in getArrayFromEntity(name) as! [GenericType] {
        resultArray.append((item, 99))
    }
    
    return resultArray
}

func getArrayFromEntity(_ name: String) -> [RealType] {
    return [RealType()]
}

let x = setMyRealStuffRevision(entity: "Test")