Method for preventing passing temporaries as const reference that scales better then deleting the r-value overload

Question

When one wants to prevent someone passing a temporary as const reference one can delete the r-value overload:

class Foo
{
public:

    Foo(const Bar& bar) : mBar(&bar) {} 
    Foo(const Bar&&) = delete;

private:

    const Bar* mBar;
};

However, when there's multiple such parameters this method does not scale well. It requires deleting every possible combination to be effective:

Foo(const Bar&&, const Baz&, const Qux&) = delete;
Foo(const Bar&, const Baz&&, const Qux&) = delete; 
Foo(const Bar&, const Baz&, const Qux&&) = delete;
Foo(const Bar&&, const Baz&&, const Qux&) = delete;
//And every other combination...

Are there methods that scale better then this?

Answer 1

Something like this maybe? It makes it very clear that you don't want an rvalue, as well.

struct Foo{};
template <typename T>
struct NoRvalue {
    T t;
    NoRvalue(T & t);
    NoRvalue(T&& t) = delete;
};

void call_me(NoRvalue<Foo> a, NoRvalue<Foo> b);
void call_me2(Foo const & a, Foo const & b);

int main() {
    Foo f;
    call_me2(f, Foo());
    call_me(f, Foo()); // fails
}

live: https://godbolt.org/z/LT9iSw