Question

I have the following array:

int* myArray = new int[45];

If I wanted to iterate each element without knowing the actual size of the array, I would need to use a for_each?

If so, then how would you write the for_each? I was looking over the following site and reading up on for_each but can’t figure out how to put this together.

http://www.cplusplus.com/reference/algorithm/for_each/

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Update: A for_each is not a good choice in this case, due to the fact that the size of the array has to be known. vectors are the proper way to accomplish such task. My reason for using arrays, in this case, was for learning purposes. if this was a serious project I would move to something such as Lists/Vectors.

Answer 1

If you use MSVC (Microsoft Visual C++), you can use "for each."

for each(int i in arr) {
    cout << i << ' ' << endl;
}

NOTE: This only works in the block of code the array is declared in.

If not, you can also use the new range-based for loop in the C++11 standard.

for(int i : arr) {
    cout << i << ' ' << endl;
}

If you’re intent upon the std::for_each:

for_each(arr,arr + 10,[] (int i) {
        cout << i << ' ' << endl;
});

NOTE: This requires knowledge of the size of the array (in this example, 10).