This feature is available in CND, C/C++ Native Development pack for NetBeans. Currently preview version is available for download here http://cnd.netbeans.org/
In this version, auto-completion won't survive heavy editing load, I mean if you change your code a lot, auto-completion can break after certain period of time. Maybe development branch version handles code changes better. Anyway, this CND pack worth a try.
NetBeans C/C++ Development Pack 5.5 has been released. You can
download it from http://www.netbeans.info/downloads/all.php?b_id=2284
Some of the changes between the beta3 build and FCS are:
* Significant performance improvements in the code parser resulting in faster results in the Class View and Code Completion
* Programs now run in an external terminal (system dependent) by default. This allows better input control
* Significant performance improvement in the debugging module
* New project type "C/C++ Project From Existing Code" which simplifies creating a project from existing code
* Macro support in code completion
* Hyperlink navigation for macro usages and #include directives
* Reformat code
* Code folding
* Code completion
All these features will appear in next Sun Studio release, so you can
consider NetBeans C/C++ Development Pack 5.5 as a preview of new
Sun Studio IDE.