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struct IntToken {
    var value:Int
    
    init(val:Int) {
        self.value = val
    }
    
    mutating func add(val:IntToken) {
        self.value += val.value
    }
}

var table = [Any]()
table.append(IntToken(val:3))
table.append(IntToken(val:4))
var it = table[0] as! IntToken // take it out with cast and var ref
it.add(table[1] as! IntToken) // add with cast; `it` is now IntToken(val:7)
table[0] = it // put it back in (if you want to)
print(table)