t.swift

//: Playground - noun: a place where people can play

class global {
    class func getUserId() -> String {
        return "10"
    }
}

class AccountData {
    
    var data: Dictionary<String,AnyObject> = Dictionary<String,AnyObject>()
    var auth_info: Dictionary<String,AnyObject> = Dictionary<String,AnyObject>()
    var auth_type: Dictionary<String,AnyObject> = Dictionary<String,AnyObject>()
    var emailType: Dictionary<String,AnyObject> = Dictionary<String,AnyObject>()
    var contactType: Dictionary<String,AnyObject> = Dictionary<String,AnyObject>()
    
    
}

public func += <KeyType, ValueType> (inout left: Dictionary<KeyType, ValueType>, right: (KeyType, ValueType)){
    
    left.updateValue(right.1, forKey: right.0)
    
}

var accountData = AccountData()
accountData.data += ("UserId", global.getUserId() as! AnyObject) //.getUserId() returns the uID as a string: this does not work, the compiler does not recognize the overloaded operator
//accountData.data += ("UserId", "69" as! AnyObject) //this code works as expected
print(accountData.data)