[Solved] Extended for loop in C++

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When

 for (int ai : a) std::cout << ai;

is used for array – int a[20]; it can be substituted with 

 for (int i = 0; i < sizeof(a) / sizeof(a[0]); i++)
      std::cout << a[i];

or with 

 for (int *ai = a; ai < a + (sizeof(a)/sizeof(*a)); ai++)
      std::cout << *ai;

But to work with other collection, e.g. vector iterators will be required:

std::vector<int> v(20);
// for (auto i : v) std::cout << i;
for (std::vector<int>::iterator vi = v.begin(); vi != v.end(); vi++)
    std::cout << *vi;

solved Extended for loop in C++