Lopping over an array c++

for (int i = 0; i < arr.size(); ++i){
//use if we explicitly need the value of i
cout << i << ":\t" << arr[i] << endl;
}
for (int element : arr){
//modifying element will not affect the array
cout << element << endl;
}
for (int &element : arr){
//modifying element will affect the array
cout << element << endl;
}

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Mingw32/bin/ld.exe: C:\Users\mfrom\AppData\Local\Temp\ccSKcRks.o:PizzaPi.cpp:(.text$_ZN5PizzaC2Ev[__ZN5PizzaC2Ev]+0xa): undefined reference to `vtable for Pizza' collect2.exe: error: ld returned 1 exit status
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