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#ifndef INCLUDED_SRC_BUILDTOOL_MULTITHREADING_TASK_HPP
#define INCLUDED_SRC_BUILDTOOL_MULTITHREADING_TASK_HPP
#include <functional>
#include <type_traits>
class Task {
public:
using TaskFunc = std::function<void()>;
Task() noexcept = default;
// NOLINTNEXTLINE(modernize-pass-by-value)
explicit Task(TaskFunc const& function) noexcept : f_{function} {}
explicit Task(TaskFunc&& function) noexcept : f_{std::move(function)} {}
void operator()() { f_(); }
// To be able to discern whether the internal f_ has been set or not,
// allowing us to write code such as:
/*
Task t;
while (!t) {
t = TryGetTaskFromQueue(); // (*)
}
t(); // (**)
*/
// (*) does `return Task();` or `return {};` if queue is empty or locked)
// (**) we can now surely execute the task (and be sure it won't throw any
// exception) (for the sake of the example, imagine we are sure that the
// queue wasn't empty, otherwise this would be an infinite loop)
explicit operator bool() const noexcept { return f_.operator bool(); }
private:
TaskFunc f_{};
};
#endif // INCLUDED_SRC_BUILDTOOL_MULTITHREADING_TASK_HPP
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