enum: Enum objects

In struct: Statistics in R Using Class-based Templates

Description

A base class in the struct package. Not normally called directly.

Usage

enum(
  name,
  description = character(0),
  type = "character",
  value = character(0),
  max_length = 1,
  allowed
)

## S4 replacement method for signature 'enum'
value(obj) <- value

Arguments

name	the name of the object
description	a description of the object
type	the type of the struct object
value	value of the enum
max_length	Maximum length of value vector (default 1)
allowed	A list of allowed values
obj	an enum object

Details

An enum object is a special type of entity object that ensures the value must be one from a list of allowed values.

Enum objects are usually defined in the prototype of another object, but can be extracted using param_obj and output_obj.

Value

an enum object

Examples

# Create a new enum object
E = enum(
    name = 'example',
    description = 'this is an example',
    type = 'character',
    value = 'hello',
    allowed = c('hello','world')
)

# Get/set the value of the entity object
value(E)
value(E) = 'world'

struct documentation built on Nov. 8, 2020, 8:14 p.m.