The user opening a previously closed project results in the entire project being re-indexed.
Closing a project results in the index being deleted. Search features will not report any results for closed projects.
C/C++ search C/C++ Indexer C/C++ Indexer Progress Bar
Selection Searching for C/C++elements Setting Source Folders
C/C++ search page, Searchdialog box C/C++ Project Properties, Indexer