C++23's `std::forward_like`

[lefticus]

https://en.cppreference.com/w/cpp/utility/forward_like

(it's useful for deducing this)

[elbeno]

👍 https://wg21.link/P2445 cites the original use case for deducing this as a motivation for forward_like: optimal forwarding of a lambda capture, where the closure object needs to know if it's a one-shot callback, or if it may be called again.

[lefticus]

Episode code sample: https://compiler-explorer.com/z/hh1x7ne3d

[lefticus]

Coming in Ep448