Assert an argument has known prototype and/or size or is NULL

Assert an argument has known prototype and/or size or is NULL

vec_assert_or_null(
  x,
  ptype = NULL,
  size = NULL,
  arg = caller_arg(x),
  call = caller_env()
)

Arguments

x

A vector argument to check.

ptype

Prototype to compare against. If the prototype has a class, its vec_ptype() is compared to that of x with identical(). Otherwise, its typeof() is compared to that of x with ==.

size

A single integer size against which to compare.

arg

Name of argument being checked. This is used in error messages. The label of the expression passed as x is taken as default.

call

The execution environment of a currently running function, e.g. caller_env(). The function will be mentioned in error messages as the source of the error. See the call argument of abort() for more information.

Value

Either throws an error or returns x, invisibly.