Re: Choosing a data structure for cache of multiple fake cursors.

[Eli Zaretskii <eliz@gnu.org>]

> Date: Mon, 24 Dec 2018 22:18:12 -0800
> From: Keith David Bershatsky <esq@lawlist.com>
> 
> The elements of the cache are as follows:  x [int]; fx [frame x | int]; y [int]; fy [frame y | int]; hpos [int]; vpos [int]; h [height | int]; cursor_type [int]; cursor_width [int]; foreground [vector of 3 doubles]; background [vector of 3 doubles]; active_p [bool]; minimal_p [bool]; flavor [int]; posint [int].

You didn't describe what each element means.

> In this example, we want to find all VPOS entries in the cache for 5, 8 and 25 and do two things:  (i) erase the fake cursors on the line; and, (2) recalculate/redraw the fake cursors on those lines based on the new layout.
> 
> Assuming that we are dealing with a potential of 200+ fake cursors on a visible window, what is the best data structure for performance and ease of add/removing elements (with 15 sub-elements)?

If the number of elements is fixed, then a vector would be more
convenient, but other than that, I don't see why it would be a poor
choice to use a list.  We access and modify lists (and other Lisp
objects) from C code all the time, to say nothing of the fact that
these objects and the primitive operations on them are implemented in
C to begin with.