Fastest Way to Append Multiple Elements to an Array

[Steven Schveighoffer via Digitalmars-d-learn]

On 12/14/14 6:16 PM, "Nordlöw" wrote:
> What's the fastest way to append multiple elements to an array?:

Before appending, call reserve to avoid the possibility of reallocating 
multiple times:

arr.reserve(arr.length + n); // about to append n elements.

> Either
>
>      arr ~= e1;
>      arr ~= e2;
>      arr ~= e3;
>
> or
>
>      arr ~= [e1,e2,e3];

I wish this would be fastest, but it's not, because this allocates an 
array on the heap with elements e1, e2, e3 before appending. It would be 
a superb addition to D if this would simply allocate a stack array (if 
the array never escapes the expression).

-Steve