For Currently Netbeans has a very good code assistance and code completition, and it has become one of the best IDE for
c++ development, even better than MSVC. Its code navigation engine works pretty fine, even with c++ (which is has a more
complex grammar than Java) , but it isn't perfect at all. After all, nothing is perfect I know. 

Incremental symbols parsing could work most of the time, but sometimes a more thorough code analysis is required.

The fact is that the code navigation could get confused when a large portion of a c++ project is modified, or when a
refactoring is performed. So then some classes disappear from the class browser and the navigator is unable to show
symbols in some files. This problem affects more to c++ projects, when Java navigation issues are very rare (due of the
simplicity of Java language).

I've found a workaround for this issue, and is deleting the /vars folder in the settings folder of netbeans (in my
system is located at  "~/.netbeans/dev" ). 

But is not very comfortable to doing this every time when the code navigator gets confused. Most IDE's have a command
for clear the symbols database and  reparsing all the source files. And netbeans needs a command like this in the
project panel or in the source menu. It could be easy to implement (just deleting the files where the symbols database
is stored).

If this feature is enabled, then Netbeans could become the BEST Ide for C++ and Java.