How to use std::for_each over std::array<> and apply lambda function on each element?

Question

I want to combine these three features together:

• std::for_each
• std::array
• lambda function

into one example using C++11.

std::for_each(arr, arr + sizeof(arr) / sizeof(int), [&](int x) { std::cout<<x<<" ";});

How to convert that code to operate over std::array ?

Answer 1

You want array::begin and array::end of the array, for the two first parameters of for_each(), which will mark the start and end of the array.

Then the third parameter is a function, in your case a lambda function, like this:

std::for_each(myarray.begin(), myarray.end(), [](int x) { std::cout << x <<" "; });

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PS: For a more generic approach, you could use std::begin() and std::end(), so that if the container changes (from std::array to std::vector for example), you can keep this code unchanged.