<valarray>: P1614R2 added operator== for slice, but not gslice

[StephanTLavavej]

P1614R2 Adding Spaceship <=> To The Library added operator== to <valarray>'s slice, which contains size_t start(), size(), stride() (see WG21-N4878 [class.slice.overview]).

gslice, which contains size_t start() and valarray<size_t> size(), stride() (see N4878 [class.gslice.overview]), wasn't mentioned in P1614R2. As the valarray members are equality comparable, it would seem consistent and reasonable to add an equality operator to gslice. This seems like an oversight (or if it was intentional, an explanation was missing).

This would be an easy Library Evolution issue to file, or even a small proposal for someone to write.

Originally noticed by statementreply.

[timsong-cpp]

the valarray members are equality comparable

I don't think this is true. Comparing two valarrays gives you a valarray<bool> (or an expression template that converts to one), not bool.

[StephanTLavavej]

Thanks, I'll buy that.