Comments (2)
Issue seems to be sink tuple
drops sink
afaik so you probably want:
type
A = object
B = object
C = object
proc foo[A, B, C: tuple](input: sink A; adding: sink B; output: var C) =
output = (input[0], adding[0], adding[1])
let combine = foo[(A,), (B, C), (A, B, C)]
echo typeof(combine)
from nim.
Unfortunately, it doesn't look like that will work for my specific use case. I had simplified my code for the sake of repro, but what I'm doing is passing the proc reference to a function, more like this:
type
A = object
B = object
C = object
proc foo[X, Y, Z: tuple](input: sink X; adding: sink Y; output: var Z) =
output = (input[0], adding[0], adding[1])
proc useFoo(fooArg: proc (existing: sink (A, ), newValues: sink (B, C), output: var (A, B, C)) {.nimcall.}) =
discard
useFoo(foo)
This still fails:
/usercode/in.nim(12, 7) Error: type mismatch
Expression: useFoo(foo)
[1] foo: proc (input: sink X: tuple, adding: sink Y: tuple, output: var Z: tuple)
Expected one of (first mismatch at [position]):
[1] proc useFoo(fooArg: proc (existing: sink (A,); newValues: sink (B, C);
output: var (A, B, C)) {.nimcall.})
expression 'foo' is of type: proc (input: sink X: tuple, adding: sink Y: tuple, output: var Z: tuple)
from nim.
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from nim.