Loop Fusion
Iterate efficiently over a variadic number of containers.
- The loop structure is generated inline at compile-time.
- There are no temporary allocation.
Status
The containers can be seq of any type. In the future this will be generalized to openarray or even an Iterable concept.
Known limitations
At the moment:
- all the seqs must contain the same element type.
- the iteration values cannot be assigned to.
Usage
import loopfusion
let a = @[1, 2, 3]
let b = @[11, 12, 13, 10]
let c = @[10, 10, 10]
forEach [x, y, z], [a, b, c]:
echo (x + y) * z
forEachIndexed j, [x, y, z], [a, b, c]:
echo "index: " & $j & ", " & $((x + y) * z)120
140
160
index: 0, 120
index: 1, 140
index: 2, 160
import loopfusion
let a = @[false, true, false, true, false]
let b = @[1, 2, 3, 4, 5]
let c = @["a: ", "b: ", "c: ", "d: ", "e: "]
var d: seq[int] = @[]
forEachIndexed j, [x, y, z], [a, b, c]:
if x:
d.add $(y*y)
else:
d.add $y
echo d@[0, 140, 320]
import loopfusion
let a = @[1, 2, 3]
let b = @[11, 12, 13]
let c = @[10, 10, 10]
let d = @[5, 6, 7]
loopFusion(d,a,b,c):
let z = b + c
echo d + a * z26
50
76
