Add helpers to work with scalars

[robinchrist]

Hi,

It would be great if there were helpers to work with scalars, e.g. if multiplies allowed to multiply a sequence with a scalar

Alternatively there could be a fill function or similar that allows creating an integer sequence with all elements identical from a scalar and a size

What do you think?

[d-frey]

Did you see scale? https://github.com/taocpp/sequences#header-taoseqscalehpp

[robinchrist]

Nope, I didn't 🤦‍♂️ Thank you for the hint.

Maybe a note at multiplies would be good, something like
"For the scalar version, see scale"

[robinchrist]

Is there something similar for plus? Like offset instead of scale

[d-frey]

I can add the hint when I have some time.

Currently, there is only scale as it is the only thing I encountered in practice. The problem with a library like taocpp/Sequences is, that you could easily add a thousand little helpers, so I'd like to restrict it to cases that are actually useful in practice. Do you have an actual use-case for offset?

[robinchrist]

Yeah, I'm building unshuffle sequences for complex numbers (AoS to SoA), which is basically
2*Is..., 2*Is + 1 ... for a standard index_sequence<Is...>

[d-frey]

OK, I'll need some time as I'm quite busy.

[robinchrist]

Yeah no worries, there's no rush

Maybe I'll try to add such a helper myself, shouldn't be too difficult