Nothing
Addition_S3 <- function(x_l = list()) {
value <- x_l
attr(value, 'class') <- 'Addition_S3'
value
}
addNumeric <- function(o_, x_n, y_n) UseMethod('addNumeric', o_)
addNumeric.Addition_S3 <- function(o, x_n, y_n) x_n + y_n
addDouble.Addition_S3 <- function(o, x_d, y_d) x_d + y_d
addInteger.Addition_S3 <- function(o, x_i, y_i) x_i + y_i
divideByZero.Addition_S3 <- function(o, x_n) x_n / 0
generateWarning.Addition_S3 <- function(o, x_ = 0L) 1:3 + 1:7 + x_
generateError.Addition_S3 <- function() stop('generated error')
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