Implementing move assignment in terms of destructor and move constructor

Say I have a class which manages memory and thus needs user-defined special member functions (imagine vector or similar).

Consider the following implementation of the move-assignment operator:

Class& operator=(Class&& rhs)
{
    this->~Class();                    // call destructor
    new (this) Class(std::move(rhs));  // call move constructor in-place
}

1. 
   

   Is it valid to implement a move-assignment operator this way? That is, does calling a destructor and constructor in this way not run afoul of any object lifetime rules in the language?

   
   


2. 
   

   Is it a good idea to implement a move-assignment operator this way? If not, why not, and is there a better canonical way?