CODEWITHSUNDEEP
rr-s4
Zhilong Jia
Zhilong Jia

Reputation: 2359

setMethod for two different object signature in R

How to make it using one setMethod as the function section is the same in the following two line codes? like signature("Triangle|Square"). Thank you.

setMethod("sides", signature("Triangle"), function(object) 3)
setMethod("sides", signature("Square"), function(object) 3)

Upvotes: 3

Views: 1174

Answers (1)

Martin Morgan
Martin Morgan

Reputation: 46866

The usual approach is

.sides_body = function(object) 3
setMethod("sides", "Triangle", .sides_body)
setMethod("sides", "Square", .sides_body)

unless there is a class relationship and the definition is the same across classes

setClass("Shape")
setClass("Triangle", contains="Shape")
setClass("Square", contains="Shape")
setClass("Circle", contains="Shape")
setMethod("sides", "Shape", function(boject) 3)
setMethod("sides", "Circle", function(object) Inf)

Upvotes: 6

Related Questions