Introduce error handling

src/error.rs

@@ -0,0 +1,31 @@
+use std :: { * , any :: * , future :: * } ;
+
+
+
+# [ derive (Debug) ] pub enum ZoodexError {
+	CollectionFileError ,
+}
+
+pub type Result <Success> = result :: Result < Success , ZoodexError > ;
+
+impl From < Box < dyn Any + Send > > for ZoodexError {
+	fn from ( error : Box < dyn Any + Send > ) -> Self {
+		* error . downcast () . unwrap ()
+	}
+}
+
+pub async fn async_result_context <
+	AsyncFunction : Future < Output = Result <Success> > ,
+	SuccessHandler : Fn (Success) ,
+	FailureHandler : Fn (ZoodexError) ,
+	Success ,
+> (
+	function : AsyncFunction ,
+	on_success : SuccessHandler ,
+	on_failure : FailureHandler ,
+) {
+	match function . await {
+		Ok (value) => on_success (value) ,
+		Err (error) => on_failure (error) ,
+	} ;
+}