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#include <functional>
#include <iostream>
std::function<int()> generator = []{
int i = 0;
return [=]() mutable {
return i < 10 ? i++ : -1;
};
}();
int main(void)
{
int ret = 0; while ((ret = generator()) != -1) std::cout << "generator: " << ret << std::endl;
}
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