nanonext (version 1.4.0)

is_error_value: Error Validators

Description

Validator functions for error value types created by nanonext.

Usage

is_error_value(x)
is_nul_byte(x)

Value

Logical value TRUE or FALSE.

Arguments

x

an object.

Details

Is the object an error value generated by the package. All non-success integer return values are classed ‘errorValue’ to be distinguishable from integer message values. Includes error values returned after a timeout etc.

Is the object a nul byte.

Examples

s <- socket()
r <- recv_aio(s, timeout = 10)
call_aio(r)$data
close(s)
r$data == 5L
is_error_value(r$data)
is_error_value(5L)

is_nul_byte(as.raw(0L))
is_nul_byte(raw(length = 1L))
is_nul_byte(writeBin("", con = raw()))
is_nul_byte(0L)
is_nul_byte(NULL)
is_nul_byte(NA)