I am experimenting with proxy reference class as some_iterator::reference and discovered that I need const assignment operator to satisfy std::indirectly_writable.
Why do normal iterators with pure references satisfy this concept?
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1"*For "normal" ranges (say, `vector
`, the `iter_reference_t – 康桓瑋 Feb 07 '23 at 15:40` gives you `int&`, and `const iter_reference_t &&` is... still just `int&`. That's why this just works.*" see https://stackoverflow.com/a/63413121/11638718