http://en.wikipedia.org/wiki/Zero_matrix On 9 Apr 2014 21:26, "Tommi Tissari" <rusty.ga...@icloud.com> wrote:
> > On 09 Apr 2014, at 20:46, Kevin Ballard <ke...@sb.org> wrote: > > > > Why? Zero is the additive identity. > > Zero is _an_ additive identity for numbers, but not for vectors or > matrices. > > use std::slice::Items; > use std::iter::RandomAccessIterator; > use std::num::Zero; > > Items is a RandomAccessIterator, but a RandomAccessIterator is not an > Items. 0 is an additive identity, but an additive identity is not 0. You > can't assign a zero to a 2x2 matrix, and therefore this trait is > incorrectly named. The following just looks wrong: > > let m: Matrix = Zero::zero(); > > > AdditiveIdentity is the only reasonable alternative, but that's a > mouthful of a name and I think changing the name to this would be more > confusing. > > Naming a trait something that it's not is even more confusing. I don't > think we should give an incorrect name to this trait on the grounds of the > correct name being longer. Just look at RandomAccessIterator. > > _______________________________________________ > Rust-dev mailing list > Rust-dev@mozilla.org > https://mail.mozilla.org/listinfo/rust-dev >
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