Define a scalar property

Ready-to-use property_scalar() variants for the common atomic base types.

Usage

property_scalar(class, default = NULL)

class_string

class_integer

class_double

class_boolean

Arguments

class

S7 class spec. Base type the value must be an instance of.

default

Any. Passed to S7::new_property().

Value

An S7 property whose value must be a scalar atomic.

Examples

library(S7)
Point := new_class(properties = list(x = property_scalar(S7::class_double)))
Point(1.5)
#> <Point>
#>  @ x: num 1.5
library(S7)
Board := new_class(
  properties = list(
    label = class_string,
    rank = class_integer,
    score = class_double
  )
)
Board("check", 1L, 0.5)
#> <Board>
#>  @ label: chr "check"
#>  @ rank : int 1
#>  @ score: num 0.5