cpp/coroutine/coroutine handle/from address

Creates a from a null pointer value or an underlying address of another. The underlying address of return value is.

The behavior is undefined if is neither a null pointer value nor an underlying address of a. The behavior is also undefined if the is an underlying address of a, where both  and  are not , and  is different from.

This function is not declared for specialization.

Return values
A whose underlying address is.