Type Alias ParameterCallback 

pub type ParameterCallback = Arc<dyn Fn(&Context, &dyn Parameter, Arc<dyn Any + Send + Sync>) -> Result<Arc<dyn Any + Send + Sync>, ClickError> + Send + Sync>;

Callback for parameter value processing.

Receives the current context, the parameter, and the converted value. Returns the (possibly transformed) value or an error.

Aliased Type

pub struct ParameterCallback { /* private fields */ }