Understand C++ Code with AI

01 Read a small example

Keep the positive numbers.

Start with four numbers: −3, 0, 2 and 5. Keep each number greater than zero. The result contains 2 and 5, in the same order.

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positive.cpp

std::vector<int> numbers{-3, 0, 2, 5};
std::vector<int> positive;
std::copy_if(numbers.begin(), numbers.end(),
    std::back_inserter(positive),
    [](int number) { return number > 0; });