[indent=4]
init
x: array of int = {1, 2, 3}
y: array of int = {4, 5, 6}
z: array of int = x + y
The above code produces this error message:
concat_arrays.gs:6.23-6.27: error: Incompatible operand
z: array of int = x + y
The Vala translation doesn't work any better:
int main () {
int[] x = {1, 2, 3};
int[] y = {4, 5, 6};
int[] z = x + y;
return 0;
}
The error message is:
concat_arrays_v.vala:4.15-4.19: error: Incompatible operand
int[] z = x + y;
What is the correct way to do this?
Using GLib.Array<T>:
int main () {
int[] x = {1, 2, 3};
int[] y = {4, 5, 6};
Array<int> a = new Array<int> (false, true, 0);
a.append_vals (x, x.length);
a.append_vals (y, y.length);
// taking over ownership avoids array copying
int[] z = (owned) a.data;
foreach (var i in z) {
stdout.printf ("%d ", i);
}
stdout.printf ("\n");
return 0;
}
The Genie version:
[indent=4]
init
x: array of int = {1, 2, 3}
y: array of int = {4, 5, 6}
var a = new Array of int (false, true, 0)
a.append_vals (x, x.length)
a.append_vals (y, y.length)
z: array of int = (owned) a.data
Update: After answering this question I have modified the above code to use (owned) which avoids an uneccessary array copy operation.
The new Array<T> still adds some overhead for allocating an object, but that should be no problem in most cases.
Using Memory.copy is dangerous as it can cause all sorts of memory problems.
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