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#pragma once
#include <util/generic/ptr.h>
#include <util/generic/vector.h>
#include <functional>
#include <mutex>
namespace NThreading {
class IGenericLocalStorage {
public:
struct TTraits {
size_t Size = 0;
std::function<void(void*)> Constructor;
std::function<void(void*)> Destructor;
};
struct TData
: TNonCopyable
{
TVector<char> Memory;
std::function<void(void*)> Destructor;
public:
~TData() {
if (Destructor) {
Destructor(&Memory[0]);
}
}
};
public:
virtual ~IGenericLocalStorage() {};
void* GetMemory(const TTraits& traits) const {
TData* data = GetData();
if (!data->Destructor) {
data->Destructor = traits.Destructor;
data->Memory.resize(traits.Size);
traits.Constructor(&data->Memory[0]);
}
return &data->Memory[0];
}
private:
virtual TData* GetData() const = 0;
};
using TGenericLocalStorageFactory = std::function<THolder<IGenericLocalStorage>()>;
void SetGenericLocalStorageFactory(TGenericLocalStorageFactory factory);
THolder<IGenericLocalStorage> MakeGenericLocalStorage();
template <typename T>
class TGenericLocalValue {
private:
static const auto& Traits() {
const static IGenericLocalStorage::TTraits traits = {
.Size = sizeof(T),
.Constructor = [](void* addr) { new (addr) T(); },
.Destructor = [](void* addr) { static_cast<T*>(addr)->~T(); }
};
return traits;
};
public:
T* Get() const {
std::call_once(InitOnce_, [this]() {
Storage_ = MakeGenericLocalStorage();
});
return static_cast<T*>(Storage_->GetMemory(Traits()));
}
T& GetRef() const {
return *Get();
}
private:
mutable std::once_flag InitOnce_;
mutable THolder<IGenericLocalStorage> Storage_;
};
}
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