The trouble with scopes

• Increasing the nesting of scopes invites shadowing
  (and also makes code harder to understand).

• Some partial solutions:

  1. Avoid using global scope when possible;

  2. Use a naming convention to indicate the scope of variables;

  3. Also note class member naming convention:

     
     class Point
     {
         int m_x; // Indicate member with m_ prefix
         int m_y;
         //...
     };