Concepts
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	ValueOrError<T, E>A boolean concept matching types with either a value or an error. 
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	ValueOrNone<T>A boolean concept matching types with an optional value. 
ValueOrError<T, E>
A boolean concept matching types with either a value or an error.
ValueOrNone<T>
A boolean concept matching types with an optional value.
Last revised: December 11, 2018 at 14:56:04 UTC