set the array capacity. If the array capacity isn't currently large enough
to hold the requested capacity (in number of elements), then the array is
resized/reallocated to the appropriate size. Pass in a requested capacity
of 0 to get the current capacity. Returns the number of elements that can
actually be stored once the resizing is done.
The D Programming Language's Unofficial Docs
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set the array capacity. If the array capacity isn't currently large enough to hold the requested capacity (in number of elements), then the array is resized/reallocated to the appropriate size. Pass in a requested capacity of 0 to get the current capacity. Returns the number of elements that can actually be stored once the resizing is done.