Memory allocation while using @views

kristoffer.carlsson · August 16, 2021, 1:40pm

I don’t think @views makes the LHS of an assignment like += into a view:

 @macroexpand @views a[:] += b[:]

:(let var"##a#296" = a, var"##i#297" = (:)
      var"##a#296"[var"##i#297"] = (Base.maybeview)(var"##a#296", var"##i#297") + (Base.maybeview)(b, :)
  end)

github.com/JuliaLang/julia

at-views macro to convert a whole block of code to slices=views

JuliaLang:master ← stevengj:views

opened 10:05PM - 20 Jan 17 UTC

stevengj

+130 -14

This PR provides an `@views` macro that you can apply to a whole block of code (…e.g. a whole function definition) to convert *every* array-slicing operation into a view. Scalar indexing is not affected. This allows you to opt-in to slices=views with minimal effort, a lot easier than adding `@view` or calls to `view` everywhere. This is especially easier for updating operations like `.+=`, where you can't put `view` on the left-hand side (as discussed [on discourse](https://discourse.julialang.org/t/is-there-a-way-to-choose-the-indices-for-broadcasting/1317)).

This is especially easier for updating operations like .+= , where you can’t put view on the left-hand side (as discussed on discourse).