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A no-op callback is a function that does nothing and returns nothing. In C++, a no-op callback using the std::function signature can be created as follows:
std::function<void()> noOpCallback = [](){};
This creates a lambda function that does nothing and takes no arguments. The lambda function is then assigned to a std::function object with a return type of void and no arguments. This std::function object can then be passed as a callback to another function that expects a std::function object with this signature. When the callback is invoked, nothing will happen.