Buffer size policy when using std.experimental.allocator.

[Rikki Cattermole via Digitalmars-d]

On 29/01/16 3:58 AM, QAston wrote:
> Hi.
>
> I have the following code:
> /++
> A queue like buffer that's first filled up with insertBack, then
> depopulated using removeFront() until it's empty.
> +/
> struct TransducerBuffer (T, Allocator)
> {
>      private Allocator _allocator;
>      private T[] _array;
>      void insertBack(auto ref T newElem) {
> // the interesing part
>      }
>
>      T removeFront() {
>      }
>
>      size_t length() {
>      }
>
>      void clear() {
>      }
> }
>
> The buffer will allocate elements one by one (total amount is not known
> beforehand).
>
> My question is:
> Should I just use expandArray(_allocator, _array, 1 newElem) and count
> on the allocator to provide sensible allocation size policy, or should I
> do the policy myself by for example requesting expandArray(_allocator,
> _array, 2*lastAllocationSize newElem)?

Do one at a time but support reserving many more is the way I'd go.