Comments (2)
I guess the reason is that non-literal ranges (so ranges, defined outside of the cfor context) cannot be effectively rewritten in a simple while loop. So two examples:
// range is within macro context
cfor(0 until 100 step 5) { i => ???}
// so we expand it into this loop
var i = 0
while (i < 100) {
???
i += 5
}
// here the range itself is outside of the cfor macro context, so it cannot know the shape of the range
val range = 0 until 100 step 5
cfor(range) { i => ???}
// so we expand it into a foreach over range, which is also a nice and fast method to use
range.foreach { i => ???}
I guess I need to clarify this warning a bit:
- add benchmarks on literal and non-literal ranges (I bet they will be almost the same)
- maybe expand non-literal ranges into another shape of while loop?
- more clear warning message in this macro (if my attempt on non-literal expansion fails)
from cfor.
thanks for the explanation
from cfor.
Related Issues (2)
- Support for Scala 3 HOT 2
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from cfor.