thank you, do you know how to reuse an array? it seems to reset
the capacity when you set the length to 0, so it reallocates when
you append to it
```
import std.stdio;
import std.format;
void main()
{
int[] xs;
foreach (i ; 0..3)
{
format("1: length:%s capacity:%s ptr:%s",xs.length,
xs.capacity, xs.ptr).writeln;
xs.length = 0;
format("2: length:%s capacity:%s ptr:%s",xs.length,
xs.capacity, xs.ptr).writeln;
xs ~= i;
format("3: length:%s capacity:%s ptr:%s",xs.length,
xs.capacity, xs.ptr).writeln;
writeln("------------------------");
}
}
```
gives me
```
1: length:0 capacity:0 ptr:null
2: length:0 capacity:0 ptr:null
3: length:1 capacity:3 ptr:72DECA101020
------------------------
1: length:1 capacity:3 ptr:72DECA101020
2: length:0 capacity:0 ptr:72DECA101020
3: length:1 capacity:3 ptr:72DECA101060
------------------------
1: length:1 capacity:3 ptr:72DECA101060
2: length:0 capacity:0 ptr:72DECA101060
3: length:1 capacity:3 ptr:72DECA1010A0
------------------------
```
