foo.cc: In member function 'void MyClass::click()':
foo.cc:16:20: 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:28:18: 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:37:18: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
    for(int i=0; i<q.size(); i++)
                 ~^~~~~~~~~

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