Is there a cast (or standard function) with the opposite effect to `std::move`

Question

First off, this question is not a duplicate of Function dual to std::move? or of Does the inverse of std::move exist?. I am not asking about a mechanism to

Answer 1

This appears to work in all of your cases:

template 
constexpr typename std::remove_reference::type& copy(T&& t) {
    return t;
};

It's exactly like std::move, except it returns an lvalue reference instead.