Macro utils_results::errcast [−][src]
macro_rules! errcast {
($result : expr) => { ... };
($result : expr, $format_str : literal $(, $val : expr) *) => { ... };
($result : expr, $kind : ty $(, $format_str : expr $(, $val : expr) *) ?) => { ... };
}
Expand description
Any type of error can be converted into our Master Error. (non panic unwraping)
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// example
// <Unwraped Ok> = errcast!(<Any Result>, <Master Err>, <Optional,..>);
let num_read = errcast!(file.read(&mut buf), err::ReadErr, "this is {} data.", "meta");
also can
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let num_read = errcast!(file.read(&mut buf));
let num_read = errcast!(file.read(&mut buf), "some error.");