File: exchange.cc

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c%2B%2B-annotations 12.2.0-2
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    #include <utility>
    #include <iostream>
    using namespace std;

    int main(int argc, char **argv)
    {
        bool more = argc > 5;

        cout << "more than 5: " << exchange(more, argc > 2) <<
                ", more than 2: " << more << '\n';
    }
    /*
        Using g++ at least version 7.0.0:
        With `a.out one two three' displays:

        more than 5: 0, more than 2: 1

    */