safocl wrote: In my example, **g++** generates potentially more compact code using `std::function_ref`, but that certainly doesn't mean it's better or more performant. It's a shame I can't test this for **clang++** at the moment, since, as far as I understand, `std::function_ref` isn't yet implemented in the standard library. https://godbolt.org/z/jhGb4K5ne
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