x is single positive integer (with or without zero allowed) — assert_single_pos

Check that value x is single positive integer

assert_single_pos_int(x, zero_allowed = TRUE, name = deparse(substitute(x)))

Arguments

x	Value to check if single positive integer
zero_allowed	Indicator (TRUE/FALSE) of whether zero is allowed
name	Name

Check that x is single positive integer (zero allowed or disallowed using zero_allowed parameter)