More on vectorized comparisons

[Peter Alexander]

On Monday, 27 August 2012 at 20:29:29 UTC, bearophile wrote:
> I think in code like this:
>
> if (a[] >= 0)
>     b[] += c[];
>
> The 'b' and 'c' arrays receive the implicit index of the items 
> of 'a' that aren't negative.

Ok, I can see the use of this, but I find the syntax *very* 
confusing. Expressions shouldn't be able to mess with code 
semantics like that.

If you wanted to do something like that, I could live with this 
syntax:

b[] += (a[] >= 0 ? c[] : 0);

The a[] >= 0 returns a vector of booleans, and then the ternary 
operator acts element-wise with those booleans as the condition.