I didn't realize ÷ was div! I think people would be happier if they knew they could use A[n÷2] instead of A[div(n,2)].
On Sunday, November 15, 2015 at 12:48:54 PM UTC+11, Steven G. Johnson wrote: > > See also > > https://github.com/JuliaLang/julia/issues/10154 > > where a lot of this was discussed. > > Non-integer indices often indicate a mistake on the part of the programmer > (e.g. using / rather than ÷, i.e. div), and it is more reliable to force > the programmer to be explicit about what was intended (both to indicate > whether they want round/floor/ceil, and to correct unintentional type > instabilities that often accrue from accidental floating-point indices). > It is also a headache for people implementing AbstractArray subtypes, > because it creates an expectation that they will implement non-obvious > getindex methods for Real types, with calls to the to_index method as > needed. > > I feel like 99% of the problems that people have with deprecating > floating-point indices arise because they used / rather than ÷ for an > integer division. I wonder if there is some way to give a helpful warning > in such cases? >
