[−][src]Macro status::ensure
Return early with an error if a condition is not satisfied.
This macro is equivalent to if !$cond { return Err(From::from($err)); }
.
Analogously to assert!
, ensure!
takes a condition and exits the function
if the condition fails. Unlike assert!
, ensure!
returns an Error
rather than panicking.
Example
status::ensure!(user == 0, "only user 0 is allowed");
fn read_file() -> Result<()> { status::ensure!(depth <= MAX_DEPTH, ErrorKind::Read); }