/in/foo.cc: In function 'int main()':
/in/foo.cc:32:22: warning: 'm.Violet::b' may be used uninitialized in this function [-Wmaybe-uninitialized]
   32 |    cout<<m.a<<' '<<m.b<<endl;
      |                      ^
/in/foo.cc:32:15: warning: 'm.Violet::a' may be used uninitialized in this function [-Wmaybe-uninitialized]
   32 |    cout<<m.a<<' '<<m.b<<endl;
      |               ^~~