On Thursday, 21 January 2021 at 14:00:28 UTC, cerjones wrote:
I have an iterator that steps along a 2D vector path command by
command and uses opIndex to give access to the points for the
current command. The issue is that there's a shared point
between commands, so when the iterator is on a given command,
it also needs to also allow access to the end point of the
previous command. Currently the iterator juggles the indexes so
that for a cubic you use 0,1,2,3, and 0 gives the previous end
point. But it would simplify a few things if [-1] was for
accessing the previous end point, so a cubic would allow
indexes -1,0,1,2.
I'm a bit unsure if this is reasonable or not.
Thoughts?
Not possible, indexes are of type size_t which is unsigned. If
you want negative indexes you need to wrap arrays in your own
implementation and offset 0 so that negative indexes can be used.
