Re: [lambda2] Andrzej's review

From: Peter Dimov (pdimov_at_[hidden])
Date: 2021-03-31 21:47:46

Andrzej Krzemienski wrote:
> So, you are saying the following:
> 
> std::transform(v1.begin(), v1.end(), v2.begin(), out.begin(), _2);
> 
> would mean select the second element? Yeah. This looks practical, and
> uniform with the rest of the library.

Yes. In this specific example this doesn't look very useful, but the ranges
version

        std::ranges::transform( r1, r2, r2.begin(), _1 );

actually does something useful - it assigns the elements of r1 to r2, but
if the sizes of r1 and r2 don't match, it doesn't overrun the destination.