once.h

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#pragma once
 
 
#include <promeki/config.h>
#if PROMEKI_ENABLE_CORE
#include <mutex>
#include <utility>
#include <promeki/namespace.h>
 
PROMEKI_NAMESPACE_BEGIN
 
class OnceFlag {
        public:
                OnceFlag() = default;
 
                ~OnceFlag() = default;
 
                OnceFlag(const OnceFlag &) = delete;
                OnceFlag &operator=(const OnceFlag &) = delete;
                OnceFlag(OnceFlag &&) = delete;
                OnceFlag &operator=(OnceFlag &&) = delete;
 
        private:
                template <typename Callable, typename... Args> friend void callOnce(OnceFlag &, Callable &&, Args &&...);
 
                std::once_flag _flag;
};
 
template <typename Callable, typename... Args> void callOnce(OnceFlag &flag, Callable &&callable, Args &&...args) {
        std::call_once(flag._flag, std::forward<Callable>(callable), std::forward<Args>(args)...);
}
 
PROMEKI_NAMESPACE_END
 
#endif // PROMEKI_ENABLE_CORE