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|
#pragma once
#include <util/string/cast.h>
#include <optional>
namespace NYT {
////////////////////////////////////////////////////////////////////////////////
template <class T>
struct TOptionalTraits
{
using TOptional = std::optional<T>;
using TValue = T;
};
template <class T>
struct TOptionalTraits<std::optional<T>>
{
using TOptional = std::optional<T>;
using TValue = T;
};
template <class T>
struct TOptionalTraits<T*>
{
using TOptional = T*;
using TValue = T*;
};
template <class T>
struct TOptionalTraits<TIntrusivePtr<T>>
{
using TOptional = TIntrusivePtr<T>;
using TValue = TIntrusivePtr<T>;
};
////////////////////////////////////////////////////////////////////////////////
template <class T>
struct TStdOptionalTraits
{
static constexpr bool IsStdOptional = false;
using TValueType = T;
};
template <class T>
struct TStdOptionalTraits<std::optional<T>>
{
static constexpr bool IsStdOptional = true;
using TValueType = T;
};
////////////////////////////////////////////////////////////////////////////////
} // namespace NYT
template <class T>
TString ToString(const std::optional<T>& nullable)
{
return nullable ? ToString(*nullable) : "<Null>";
}
template <class T>
struct THash<std::optional<T>>
{
size_t operator()(const std::optional<T>& nullable) const
{
return nullable ? THash<T>()(*nullable) : 0;
}
};
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