In C++.
Oups... does it really takes 8secs just to compile ???

C++ version...

IMHO should not have so many 'nice assumptions'... In real life it will require a lot of testing from the calling side

hmmmmm...

😄 Perfect C++20/23 !!

But you know what : I'm tired with 30mns trying to figure out which include I have to use in rangev3 for each algo/view/.. and line of code !!

😃

Of course !!

I was not running for perf...
Use of a rand instead of a mersenne twister, etc.. and even the use of std:experimental::simd etc...

Note on your note: any modern compiler will unroll the loop, and... turn i++ into ++i.. 😀

See my comment on the fork: you will understand why... my old reflex is C-style :-))))) \

Could write it in 6809 8 bit assembly :-)

:-)
You know what ? I'm 60 (yop a gran'pa programmer). Began programming in 1979... with 68000 assembly my boss was a p.. in the ... for ANY SINGLE CPU CYCLE...
Want the whole story: We had to rasterize an A0 plot, black and white. Makes something like 1 or 2 Mpixels. Memory chips were so expensive: my boss gave me a hardware with 256k (yop) of (static) RAM, and a 20Mo (yes, Mo) hard drive and told me: do the shit with what you have :-)
Actually with modern pipelines and cache, had to readapt... Performance is not a matter of cycles, but a matter of data, cache line and prefetch and branch prediction and...

Sorry, but ... there should be some requirements (or concepts :-)) on the Buffer typename....
Base pointer ? void * sh.. ??
Size ? (of chars ??)
Of Chars ?
... ?\

Or simply follows the rules of allocator_traits ??

Simply... excellent solution