code: public static void same(Object obj1, Object obj2, Supplier<String> message) {
      if (obj1 != obj2) {
        throw new IdentityException(message.get());
      }
    }
docs: Asserts that two {@link Object objects} are the same {@link Object} as determined by the identity comparison.
  
  The assertion holds if and only if the two {@link Object objects} are the same {@link Object} in memory.
  
  @param obj1 {@link Object left operand} in the identity comparison.
  @param obj2 {@link Object right operand} in the identity comparison.
  @param message {@link Supplier} containing the message used in the {@link IdentityException} thrown
  if the assertion fails.
  @throws org.cp.elements.lang.IdentityException if the two {@link Object objects} are not the same.
  @see java.lang.Object