Vector missing the Sum trait about euclid HOT 3 CLOSED

Hi, sounds good to me! Euclid has a no-std feature so if you would like to submit a PR, please use core::iter::Sum instead of the std one so things keep working in that configuration.
You would add a Sum implementation to all types that implement AddAssign where the parameter is the same type (for example no Sum for point types since point + point is disallowed.

from euclid.

Okay! I got started by implementing it for Angle, and that was fairly trivial, but in order for it to work with iter().sum() as well as iter().copied().sum(), it needed to have a second Sum<&Angle> impl, and this necessitated also adding an Add<&Angle> impl. All this works fine, but before I proceed with the rest of the types, I wanted to check:

• Is there a reason the other &Angle trait impls don't exist? Should that part be excluded?
• Is it okay to add them piecemeal as part of this and other changes, or would you like them added as a complete set all at once, either in this change or as a separate one ahead of it?

My work so far is here: master...mikepurvis:sum-traits

from euclid.

Closing in favour of #470.

from euclid.