The analogue of "fill-pointer" in D

[Ali Çehreli via Digitalmars-d-learn]

On 05/18/2015 05:26 AM, John Colvin wrote:
> On Monday, 18 May 2015 at 11:40:13 UTC, thedeemon wrote:
>> On Monday, 18 May 2015 at 10:24:25 UTC, Dennis Ritchie wrote:
>>
>>> No, afraid not. Function capacity is not an analogue of fill-pointers!
>>
>> It's exactly the same.
>
> But in D capacity is affected by other things.
>
> auto a = new int[20];
> auto b = arr[0..10];
> //can't now append to b without re-allocating or using assumeSafeAppend.

Perfect opportunity to inject my newly-discovered issue with capacity:

void main()
{
     auto a = new int[20];
     foo(a);
     //can't now append to a
}

void foo(const(int)[] p)
{
     p ~= 42;
}

Ali