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taryn 2025-01-05T13:23:11.217219Z
How do I create a System.Int32 from an integer literal?
I cannot put a type hint directly onto the literal (as numeric literals do not support meta) and when I do the following:
(let [^System.Int32 res-status-code 404]
(set! (. res StatusCode) res-status-code))Object of type 'System.Int64' cannot be converted to type 'System.Int32'.StatusCode is a property of type Int32.taryn 2025-01-06T13:38:52.068979Z
Thank you dm!
dmiller 2025-01-05T17:14:13.139279Z
Wrap the 404 with int:
(let [^System.Int32 x 404] (class x)) ; => System.Int64
(let [^System.Int32 x (int 404)] (class x)) ; => System.Int32(set! *warn-on-reflection* true)
(defn f [x] (.ToUpper x)) ;; prints reflection warning: reference to field/property ToUpper can't be resolved (target class is unknown)
(defn g [^String x] (.ToUpper x)) ; => #'user/g, no reflection warning
(g 12) ; => InvalidCastException: Unable to cast object of type 'System.Int64' to type 'System.String'.int gets you the right type of value to pass in.