I was just thinking about how I can prevent a call of destroy from within a
proc, because for callbacks we do not want destroy calls for parameters owned
by GTK.
But it seems that this tests does not generate a destroy call for proc
parameter at all?
type
O {.bycopy.} = object
i: int
proc new(o: var O) =
echo "new called"
proc `=destroy`*(s: var O) =
echo "=destroy called"
proc `=sink`*(a: var O; b: O) =
echo "=sink called"
proc createO: O =
result.i = 7
proc p(o: O) =
echo "working with o"
echo o.i
proc main =
var
o: O = createO()
p(o)
echo o.i
main()
Run
$ ./h
=sink called
working with o
0
0
=destroy called
Run
I have added the bycopy pragma, but that makes no difference. There is only one
destroy call, and that is for the o var in main. When I add a local var of type
O to proc p() we get another destroy call as expected.
