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checker, cgen: fix for in iterator of generic struct (#12441)
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Original file line number | Diff line number | Diff line change |
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@@ -0,0 +1,39 @@ | ||
struct Split<T> { | ||
arr []T | ||
pred fn (T) bool | ||
mut: | ||
idx int | ||
} | ||
|
||
fn (mut iter Split<T>) next() ?[]T { | ||
start := iter.idx | ||
for iter.idx < iter.arr.len { | ||
if iter.pred(iter.arr[iter.idx]) { | ||
iter.idx++ | ||
return iter.arr[start..iter.idx] | ||
} | ||
iter.idx++ | ||
} | ||
return none | ||
} | ||
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||
fn split<T>(arr []T, pred fn (T) bool) Split<T> { | ||
return Split<T>{arr, pred, 0} | ||
} | ||
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||
fn test_for_in_iterator_of_generic_struct() { | ||
items := [0, 1, 2, 3, 4, 5, 6, 7, 8] | ||
mut iter := split<int>(items, fn (item int) bool { | ||
return item % 3 == 0 | ||
}) | ||
iter.next() or {} | ||
mut ret_list := [][]int{} | ||
for item in iter { | ||
dump(item) | ||
ret_list << item | ||
} | ||
println(ret_list) | ||
assert ret_list.len == 2 | ||
assert ret_list[0] == [1, 2, 3] | ||
assert ret_list[1] == [4, 5, 6] | ||
} |