On Wednesday, 22 January 2020 at 15:33:44 UTC, Adam D. Ruppe
wrote:
On Wednesday, 22 January 2020 at 15:26:06 UTC, mark wrote:
I've done this but my impression from the docs is that passing
slices and associative arrays is already done by reference so
these aren't needed?
They are pointers passed by value.
If you're familiar with C, think of passing
struct Array {
size_t length;
element* ptr;
}
The elements are passed by ref there; they aren't copied to the
function and any changes to them will be visible outside.
BUT if you change the length of it or reallocate it in any way
those changes are NOT seen outside.
So with AAs and slices, if you just want to work with existing
elements, no need for ref. But if you are going to do any kind
of resizing - adding or removing elements - ref is likely what
you want.
Thanks - that's exactly what I needed to know!
(I'm also very much enjoying your D Cookbook.)
