#ifndef OPENMW_COMPONENTS_MISC_GUARDED_H #define OPENMW_COMPONENTS_MISC_GUARDED_H #include <condition_variable> #include <memory> #include <mutex> #include <type_traits> namespace Misc { template <class T> class Locked { public: Locked(std::mutex& mutex, std::remove_reference_t<T>& value) : mLock(mutex) , mValue(value) { } std::remove_reference_t<T>& get() const { return mValue.get(); } std::remove_reference_t<T>* operator->() const { return &get(); } std::remove_reference_t<T>& operator*() const { return get(); } private: std::unique_lock<std::mutex> mLock; std::reference_wrapper<std::remove_reference_t<T>> mValue; }; template <class T> class ScopeGuarded { public: ScopeGuarded() : mMutex() , mValue() { } ScopeGuarded(const T& value) : mMutex() , mValue(value) { } ScopeGuarded(T&& value) : mMutex() , mValue(std::move(value)) { } template <class... Args> ScopeGuarded(Args&&... args) : mMutex() , mValue(std::forward<Args>(args)...) { } ScopeGuarded(const ScopeGuarded& other) : mMutex() , mValue(other.lock().get()) { } ScopeGuarded(ScopeGuarded&& other) : mMutex() , mValue(std::move(other.lock().get())) { } Locked<T> lock() { return Locked<T>(mMutex, mValue); } Locked<const T> lockConst() const { return Locked<const T>(mMutex, mValue); } template <class Predicate> void wait(std::condition_variable& cv, Predicate&& predicate) { std::unique_lock<std::mutex> lock(mMutex); cv.wait(lock, [&] { return predicate(mValue); }); } private: mutable std::mutex mMutex; T mValue; }; } #endif