Macro simple_error::try_with
[−]
[src]
macro_rules! try_with { ($expr: expr, $str: expr) => { ... }; }
Helper macro for unwrapping Result
values while returning early with a
newly constructed SimpleError
if the value of the expression is Err
.
Can only be used in functions that return Result<_, SimpleError>
.
Examples
use self::simple_error::SimpleError; fn try_block(result: Result<(), SimpleError>, s: &str) -> Result<(), SimpleError> { Ok(try_with!(result, s)) } // Above is equivalent to below. fn try_block_equivalent(result: Result<(), SimpleError>, s: &str) -> Result<(), SimpleError> { match result { Ok(v) => Ok(v), Err(e) => { return Err(SimpleError::with(s, e)); }, } }