Updates to local CLR struct instances seem to be lost as soon as they're
made. Is this expected? In the test below, function a2 returns the identity
matrix despite my attempt to scale it. Function a passes the newly
constructed matrix to another function to do the scaling, and it returns the
scaled matrix as desired. UriBuilder is a class and works either way.
(System.Reflection.Assembly/Load "WindowsBase, Version=3.0.0.0,
Culture=neutral, PublicKeyToken=31bf3856ad364e35")
(import '(System.Windows.Media Matrix))
(import '(System UriBuilder))
; Test struct
(defn b [matrix] (doto matrix (.Scale 0.5 -0.5)))
(defn a [] (b (Matrix.)))
(defn a2 [] (doto (Matrix.) (.Scale 0.5 -0.5)))
; Test class
(defn b3 [builder] (doto builder (.set_Port 9090)))
(defn a3 [] (b3 (UriBuilder.)))
(defn a4 [] (doto (UriBuilder.) (.set_Port 9090)))
(println "Matrix struct" (a) (a2)
(= (a) (a))
(= (a2) (a2))
(= (a) (a2))) ; True True False
(println "UriBuilder class "(a3) (a4)
(= 9090 (.Port (a3)) (.Port (a3)))
(= 9090 (.Port (a4)) (.Port (a4)))
(= 9090 (.Port (a3)) (.Port (a4)))) ; True True True
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