Require Scalar Value

Validates that the value has length 1. Rejects NULL, zero-length vectors, and vectors with more than one element.

Usage

require_scalar(restriction)

Arguments

restriction

a restriction object.

Value

The modified restriction object.

See also

Other structure checks: require_dim(), require_has_cols(), require_length(), require_length_matches(), require_length_max(), require_length_min(), require_named(), require_names(), require_ncol_matches(), require_ncol_min(), require_nrow_matches(), require_nrow_min(), require_sorted(), require_unique_names()