proc fillTuple[T: tuple, V](target: var T, input: openarray[V]) =
var index = 0
for field in target.fields:
assert input.len > index
field = input[index]
inc(index)
var myTuple: tuple[a,b,c: int]
fillTuple(myTuple, @[1, 2, 3])
Or, if you want the tuple as return value:
proc fillTuple[T: tuple, V](input: openarray[V]): T =
var index = 0
for field in result.fields:
assert input.len > index
field = input[index]
inc(index)
var myTuple = fillTuple[tuple[a,b,c:int], int](@[1, 2, 3])
