On 11/28/2014 12:44 AM, bearophile wrote:
> Now we have a better syntax for implicit casts:
[...]
> app.put(ubyte(0).repeat.take(5));
Much better! :)
> But I have a question too. What's the best way to append several lazy
> items to a dynamic array? This doesn't work:
>
> void main() {
> import std.array, std.range;
> int[] arr;
> arr.put(only(1, 2, 3));
> }
I don't think there is a better way in Phobos. (?) The following trivial
function would do as long as the array has room at the end, which
requires that it is "safe to append":
void expandWith(A, R)(ref A arr, R range)
{
foreach (e; range) {
arr ~= e;
}
}
void main() {
import std.range;
int[] arr = [ 42 ];
// Ensure that there is room for new elements
arr.reserve(100);
assumeSafeAppend(arr);
const oldPlace = arr.ptr;
arr.expandWith(only(1, 2, 3));
const newPlace = arr.ptr;
assert(newPlace == oldPlace);
}
Ali
