A mixin (virtual class) for enabling keyed objects; provides consistent behavior for getting, setting, and validating keys
# S3 method for character
Key(object, quiet = FALSE, ...)# S3 method for KeyMixin
Key(object, ...)
# S3 method for KeyMixin
Key(object, ...) <- value
Key.character: object but as a syntactically-valid key
Key.KeyMixin: The key from object
Key<-: object with the key set to value
An object
Suppress warnings when updating characters to keys
Ignored
A key to set
keyA one-length character vector with the object's key; keys must
be one or more alphanumeric characters followed by an underscore
“_” (regex pattern “^[[:alnum:]]+_$”)
Key.character: Update a character to a key
Key.KeyMixin: Get the key of a keyed object
Key<-: Set the key of a keyed object