Macro http_types::ensure [−][src]
macro_rules! ensure { ($cond : expr, $msg : literal $(,) ?) => { ... }; ($cond : expr, $msg : expr $(,) ?) => { ... }; ($cond : expr, $msg : expr, $($arg : tt) *) => { ... }; }
Expand description
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.