Construct an extended collector for an extended column specification

Extended collectors are used in x_cols() column specifications to indicate which value and missing reason channel types should be used when loading data with read_interlaced_*().

Usage

x_col(value_collector, na_collector = na_col_default())

Arguments

value_collector

a value collector

na_collector

a missing reason collector

Value

a new extended collector object

See also

Other collectors: na_collectors, value_collectors