std::cout not found

I'm using CTags on Mac OS for c++ projects.

Here is the command that I execute under the directory of my c++ project:
ctags -R --c++-kinds=+p --fields+=iaS --extra=+q . /Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX.sdk/usr/include/c++/4.2.1/

As you see, I use CTags for two directories: one is ".", which means the current directory, where I put all of my head files and cpp files. The other is "/Applications/..../c++/4.2.1/", which contains the head files of c++ standard library, such as "iostream".

However, after executing the command above, it can't popup std::cout. Meaning that when I type std::, I can't find cout.

I've found a relative question: http://stackoverflow.com/questions/3655743/when-using-exuberant-ctags-what-options-to-you-use

Then I tried to add all of options: --c++-kinds=+cdefglmnpstuvx.
Now I can get cerr and endl when I type std::, but I still can't get std::cout or std::cin.