gcov to ignore standard library branch?

Question

I'm trying to use gcov/lcov to generate a report for my test suites for my source code. Is there a way to tell gcov to ignore the branches incurred by standard libraries. For example, stringstream

                     :          2 :             std::stringstream myss;
 156 [ +  - ][ +  - ]:          1 :             myss << "Testing" << std::endl;

Also, I use namespace in all of my source files. At the end of the file, gcov would report thre are branches. Where are those branches coming from ?

     [ +  - ][ +  - ]:          7 : } // end namespace
     [ +  - ][ +  - ]
     [ +  - ][ +  - ]

Thank you very much for any input!