foo.cc: In member function 'void MyClass::click()':
foo.cc:18:25: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
         for (int i=0; i <q.size(); i++)
                       ~~^~~~~~~~~
foo.cc: In member function 'void MyClass::_close()':
foo.cc:32:22: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
         for(int i=0;i<q.size();i++)
                     ~^~~~~~~~~
foo.cc: In member function 'void MyClass::move()':
foo.cc:42:22: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
         for(int i=0;i<q.size();i++)
                     ~^~~~~~~~~

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