IO scheduling is a separate problem, though it shares the same fundamental properties. The same goes for network packet scheduling. All of these are ongoing efforts. Stay tuned! :)
void Baz(Bar*);
void Baz(const Bar&);
void Foo(Bar* mutable_bar) {
Baz(*mutable_bar); // Not mutated.
}
void Foo(Bar* mutable_bar) {
Baz(mutable_bar); // Possibly mutated.
}
void Foo(const Bar& bar) {
Baz(bar); // Not mutated.
}
void Foo(const Bar& bar) {
Baz(&bar); // Compiler error.
}