allNA: Is a vector empty?
In hutilscpp: Miscellaneous Functions in C++

allNA

R Documentation

Is a vector empty?

A vector is empty if all(is.na(x)) with a special case for length(x) == 0.

allNA(
  x,
  expected = FALSE,
  len0 = FALSE,
  nThread = getOption("hutilscpp.nThread", 1L)
)

`x`	A vector. Only atomic vectors are supported.
`expected`	`TRUE \| FALSE` Whether it is expected that `x` is empty. If `TRUE` the function will be marginally faster if `x` is empty but likely slower if not.
`len0`	The result if `length(x) == 0`.
`nThread`	Number of threads to use (only applicable if `expected` is `TRUE`)