Objective Grid: An exception-safe way to change read-only cells

Problem

Is there an exception-safe way to change read-only cells?
 

Cause

Action

If you are executing operations that might throw exceptions, you might consider a more exception-safe way. Declare a class that unlocks the grid in the constructor and locks it again in the destructor.
 

To use this, just declare a CGridUnlock object whenever you want to unlock the grid. The grid will lock again when the class goes out of scope. If you want finer control, then call the Lock()/Unlock() methods of the class. If an exception is hit and the catch is outside the scope of the object, then the destructor will lock the grid again.