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openmw/components/misc/guarded.hpp

91 lines
2.0 KiB
C++

#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