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Membership test operator

Source: R/oop_s3.R
grapes-contains-grapes.Rd

Membership test operator

Usage

x %contains% y

Arguments

x

Object.

y

Another object.

Value

A Boolean value.

Examples

COMPANY <- new_class(class_name = "COMPANY")
company <- COMPANY$instantiate
register_method(COMPANY,
                ..init.. = function(name, age) {
                  self$name <- name
                  self$age <- age
                })
register_method(COMPANY,
                ..contains.. = function(y) y %in% self$name)

good_company <- company(c("patrick", "james"),
                        c(33, 34))
good_company %contains% "patrick"
#> [1] TRUE