1 #pragma once 2 3 #include <memory> 4 #include <utility> 5 6 namespace utils 7 { 8 9 class UniqueCall 10 { 11 public: 12 struct Lock 13 {}; 14 15 template <class Functor, class... Args> operator ()(Functor && functor,Args &&...args)16 void operator()(Functor&& functor, Args&&... args) 17 { 18 if (lock.expired()) 19 { 20 auto l = std::make_shared<Lock>(); 21 lock = l; 22 functor(std::move(l), std::forward<Args>(args)...); 23 } 24 } 25 26 private: 27 std::weak_ptr<Lock> lock; 28 }; 29 30 } // namespace utils 31