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2.3.2 Initializing User-Missing Value Sets

— Function: void mv_init (struct missing_values *mv, int width)

Initializes mv as a set of user-missing values. The set is initially empty. Any values added to it must have the specified width.

— Function: void mv_copy (struct missing_values *mv, const struct missing_values *old)

Initializes mv as a copy of the existing set of user-missing values old.

— Function: void mv_clear (struct missing_values *mv)

Empties the user-missing value set mv, retaining its existing width.