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This approach leverages JavaScript's built-in setTimeout and clearTimeout functions. We schedule a timeout to execute the function fn after t milliseconds, and we return a cancelFn that, when called, cancels this scheduled timeout.
In C, without a standard set of functions for asynchronous timeouts, it's less about algorithmic complexity and more about the overhead of managing threads, which varies based on the implementation details.
Python provides the threading module, which includes a Timer class to achieve similar functionality as setTimeout. We define a class TimeoutFunction to encapsulate the function and timeout behavior, with start and cancel methods for execution control.
This alternative approach involves using Promises to manage asynchronous execution and potential cancelation. By wrapping the setTimeout within a Promise, we can have more control over its execution and cancelation by managing the Promise lifecycle.
Time Complexity and space complexity would depend on the specific threading mechanism and the use of synchronization primitives.
1/* Again, in C++, achieving a Promise-like handling for timeouts requires either using the C++ Standard Library's future and promise features, or a third-party async library. *Using std::future and std::promise, you can build an equivalent structure, though native handling of simple timeouts is best achieved with condition variables or async libraries.