Move from non-reference values but pass through and preserve references.

Typically, passing an rvalue reference will convert it to an lvalue. Using sus::forward<T>(t) on an rvalue reference T&& t will preserve the rvalue nature of the reference. Other reference types are also forwarded unchanged.

The type argument must be provided, and should be the T from a T&& typename in order to properly preserve the reference type of the object of type T&&.

Universal references and moves

In the common case, when you want to receive a parameter that will be moved, it should be received by value. However, library implementors sometimes with to receive an rvalue reference. If you find yourself needing to move() from a universal reference instead of forward(), such as to construct a value type T from a universal reference T&& without introducing a copy, use IsMoveRef to constrain the universal reference to be an rvalue, and use move() instead of forward().