Mixing std.container.array and Appender

[user1234]

On Wednesday, 4 February 2026 at 08:45:06 UTC, axricard wrote:
> Hello, is there some structure in standard library that acts 
> like Appender but works also on std.container.array Arrays ?
> I'd like to have the capacity of Arrays doubling every time new 
> memory is allocated.
> Appender requires the input to be a dynamic array, which is not 
> the case for std.container.array Arrays.

To the cost of small run-time overhead one solution is to forward 
appending in a custom function, e.g

```d
void append(T)(ref T arr, int elem)
{
	arr ~= elem;

	static if (is(T == std.container.array.Array!int))
		arr.reserve(nextPow2(arr.capacity-1));

	writefln("capacity after append: %u", arr.capacity);
}
```