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slices.go
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/
slices.go
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package semantics
// helpers
type ArrayEditor struct {
s []uint64
next_val uint64
}
func (ae *ArrayEditor) Advance(arr []uint64, next uint64) {
arr[0] += 1
ae.s[0] = ae.next_val
ae.next_val = next
ae.s = ae.s[1:]
}
// tests
func testSliceOps() bool {
x := make([]uint64, 10)
x[1] = 5
x[2] = 10
x[3] = 15
x[4] = 20
v1 := x[2]
v2 := x[2:3]
v3 := x[:3]
v4 := &x[2]
var ok = true
ok = ok && (v1 == 10)
ok = ok && (v2[0] == 10)
ok = ok && (len(v2) == 1)
ok = ok && (v3[1] == 5)
ok = ok && (v3[2] == 10)
ok = ok && (len(v3) == 3)
ok = ok && (*v4 == 10)
return ok
}
func testOverwriteArray() bool {
var arr = make([]uint64, 4)
ae1 := &ArrayEditor{s: arr[0:], next_val: 1}
ae2 := &ArrayEditor{s: arr[1:], next_val: 102}
ae2.Advance(arr, 103)
ae2.Advance(arr, 104)
ae2.Advance(arr, 105) // 105 never gets written to array
ae1.Advance(arr, 2) // resets arr[0]
ae1.Advance(arr, 3)
ae1.Advance(arr, 4)
ae1.Advance(arr, 5) // 5 never written to array
// make sure all values were overwritten properly
if arr[0]+arr[1]+arr[2]+arr[3] >= 100 {
return false
}
return arr[3] == 4 && arr[0] == 4
}