Hi,
I was struggling in solving an exercise on adventofcode, filling a Nim array
with complex structures. I had a segmentation fault, and I wanted to check my
code (especially the instantiation of nested arrays) using a simple test code.
This is the code:
const
H = 1000
W = 1000
type myArray = array[H, array[W, int]]
proc fillArray(): myArray =
echo "Instanciating..."
var a: myArray
echo "OK!"
for h in 0..H:
for w in 0..W:
a[h][w] = 1
result = a
proc main() =
echo "Calling fillArray procedure..."
let a : myArray = fillArray()
when isMainModule:
main()
Run
According to the Nim documentation (I don't remember if it was on Nim by
Example, or in the Nim manual), but var a: myArray instanciates by itself the
nested array. This code produces also or a segmentation fault error:
Calling fillArray procedure...
│~
[1] 15746 segmentation fault (core dumped) ./nim_test
Run
According to this output, "something" happened at the fillArray procedure call
(as the first echo statement has not been executed... I think). I will try to
debug the code using gdb or something, but I would be grateful if someone has a
clear explanation/documentation to provide me, in order to explain the
behaviour (and the mistake I did).
Btw, I use the last version of Nim: 0.19.0.
Thanks in advance, and best wishes for the end of this year.
