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#pragma once
#include <library/cpp/yt/threading/rw_spin_lock.h>
#include <concepts>
namespace NYT {
////////////////////////////////////////////////////////////////////////////////
//! A synchronization object to load and store nontrivial object.
//! It looks like atomics but for objects.
template <class T>
class TAtomicObject
{
public:
TAtomicObject() = default;
template <class U>
TAtomicObject(U&& u);
template <class U>
void Store(U&& u);
//! Atomically replaces the old value with the new one and returns the old value.
template <class U>
T Exchange(U&& u);
//! Atomically checks if then current value equals #expected.
//! If so, replaces it with #desired and returns |true|.
//! Otherwise, copies it into #expected and returns |false|.
bool CompareExchange(T& expected, const T& desired);
//! Atomically transforms the value with function #func.
template <std::invocable<T&> F>
std::invoke_result_t<F, T&> Transform(const F& func);
//! Atomicaly reads the value with function #func.
template <std::invocable<const T&> F>
std::invoke_result_t<F, const T&> Read(const F& func) const;
T Load() const;
private:
T Object_;
YT_DECLARE_SPIN_LOCK(NThreading::TReaderWriterSpinLock, Spinlock_);
};
////////////////////////////////////////////////////////////////////////////////
template <class TOriginal, class TSerialized>
void ToProto(TSerialized* serialized, const TAtomicObject<TOriginal>& original);
template <class TOriginal, class TSerialized>
void FromProto(TAtomicObject<TOriginal>* original, const TSerialized& serialized);
////////////////////////////////////////////////////////////////////////////////
} // namespace NYT
#define ATOMIC_OBJECT_INL_H_
#include "atomic_object-inl.h"
#undef ATOMIC_OBJECT_INL_H_
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