nim-codex/codex/utils/optionalcast.nim

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import pkg/questionable
import pkg/questionable/operators
export questionable
proc `as`*[T](value: T, U: type): ?U =
## Casts a value to another type, returns an Option.
## When the cast succeeds, the option will contain the casted value.
## When the cast fails, the option will have no value.
when value is U:
return some value
elif value is ref object:
if value of U:
return some U(value)
Option.liftBinary `as`