Ticket #7952: move-assignment.patch

doc/move.qbk

@@ -129 +129 @@
 
       clone_ptr& operator=(clone_ptr&& p)
       {
-         std::swap(ptr, p.ptr);
-         delete p.ptr;
-         p.ptr = 0;
+         if (this != &p)
+         {
+            std::swap(ptr, p.ptr);
+            delete p.ptr;
+            p.ptr = 0;
+         }
          return *this;
       }
 
@@ -171 +174 @@
 
 * Put the following macro in the [*private] section:
   [macroref BOOST_COPYABLE_AND_MOVABLE BOOST_COPYABLE_AND_MOVABLE(classname)]
-* Left copy constructor as is.
+* Leave copy constructor as is.
 * Write a copy assignment taking the parameter as
   [macroref BOOST_COPY_ASSIGN_REF BOOST_COPY_ASSIGN_REF(classname)]
 * Write a move constructor and a move assignment taking the parameter as