function_ref
summary
A proposal called function_ref provides a constrained callable type that behaves like a non-owning lightweight reference to any callable matching a signature so higher order functions accept stateful lambdas without owning or heap overhead. It compares performance to function pointers and templates showing small runtime cost unlike std::function and avoids template bloat. The minimal implementation stores a void pointer to the target and a function pointer to a erased call wrapper so callers must guarantee the referent’s lifetime.
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