6.cpp

// taken from http://isocpp.org/files/papers/N3858.pdf

future<int> f(shared_ptr<stream> str)
{
    shared_ptr<vector<char>> buf = ...;
    return str->read(512, buf)
        .then([](future<int> op) { // lambda 1
            return op.get() + 11;
        }
    );
}

future<void> g()
{
    shared_ptr<stream> s = ...;
    return f(s).then([s](future<int> op) { // lambda 2
        s->close();
    });
}