Assume, I have a code:
Class *c1 = new Class1();
Then I want to call method method1() from c1. 
I type c1 and press ".". After that the code completion windows arises and offers the methods to complete. I select "method1()" and press Enter.
So, I have:
c1.method1();
BUT this is a mistake! Should be 
c1->method1();

This is a trivial example. But imagine I develop GUI code with deep-nested mixes of "." and "->". For instance, "widget.textEdit->append("checked");" or something. And editor says nothing about mistakes. Moreover, it offers variations of code completion.

How to solve... There is two variations:
1. When I press "." except of "->" must be autoreplacing proceeded, e.g. "." must be replaced to "->" automatically. This variation is I consider as the best.
2. When I press "." Code Completion windows should not arise and error message should be showed.