cxx11-range-based-for-loop.h

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// https://en.wikipedia.org/wiki/C%2B%2B11#Range-based_for_loop
 
// #1
int my_array[5] = {1, 2, 3, 4, 5};
// double the value of each element in my_array:
for (int &x : my_array) {
    x *= 2;
}
// similar but also using type inference for array elements
for (auto &x : my_array) {
    x *= 2;
}