% Generated by roxygen2: do not edit by hand
% Please edit documentation in R/utils.R
\name{.get_design_vars_flat}
\alias{.get_design_vars_flat}
\title{Get design variable column names}
\usage{
.get_design_vars_flat(design)
}
\arguments{
\item{design}{A survey design object (\code{survey_base} subclass).}
}
\value{
A character vector of column names.
}
\description{
Returns a flat character vector of all design-variable column names
(ids, weights, strata, fpc) for any survey design class. \code{NULL} entries
are dropped; names are unique. Exported for use by extension packages
(e.g., \code{surveytidy}); not intended for end users.
}
\keyword{internal}
