/in/foo.cc: In static member function 'static void Complex::Sort(std::vector<Complex>*)':
/in/foo.cc:100:16: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
   for (i = 0; i<ptr_vtInstance->size(); i++)
               ~^~~~~~~~~~~~~~~~~~~~~~~
/in/foo.cc:107:19: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
     for (j = 0; j < ptr_vtComplex->size(); j++)
                 ~~^~~~~~~~~~~~~~~~~~~~~~~
/in/foo.cc:116:11: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
     if (j == ptr_vtComplex->size())
         ~~^~~~~~~~~~~~~~~~~~~~~~~~
/in/foo.cc:121:16: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
   for (i = 0; i<ptr_vtComplex->size(); i++)
               ~^~~~~~~~~~~~~~~~~~~~~~
/in/foo.cc: In static member function 'static void Complex::VectorDisplay(std::vector<Complex>*)':
/in/foo.cc:157:17: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
   for (i = 0; i < ptr_vtInstance->size(); i++)
               ~~^~~~~~~~~~~~~~~~~~~~~~~~