D-like ranges for C++17 in a 2.5 klines single header file

[Simen Kjærås]

On Tuesday, 13 October 2020 at 10:33:05 UTC, user1234 wrote:
> compared to std.range or std.algorithm it is very unpleasant to 
> read.

It's C++. Compared to a medium-rare rib-eye, stabbing yourself in 
the groin with a fork is very unpleasant.

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   Simen