Get a filter's domain

Returns the declared domain (universe of valid values) attached to a filter, or `NULL` when no domain is set. This is a thin accessor over the `domain` property, intended for downstream consumers (e.g. GUIs) that render filter inputs from the domain without reaching into S7 internals.

Usage

filter_domain(filter)

Arguments

filter

S7 filter object.

Value

The filter's domain, or `NULL` when unset. Structure depends on the filter type (e.g. a character vector for discrete filters, a two-element vector for range filters).

See also

[filter_effective_value()], [cb_intersect_domain()]