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#pragma once
#include "yql_panic.h"
#include <util/generic/maybe.h>
#include <util/generic/variant.h>
namespace NYql {
template <typename S, typename R>
class TResetableSettingBase {
protected:
using TSet = S;
using TReset = R;
public:
void Set(const TSet& value) {
Value.ConstructInPlace(value);
}
void Reset(const TReset& value) {
Value.ConstructInPlace(value);
}
bool Defined() const {
return Value.Defined();
}
explicit operator bool() const {
return Defined();
}
bool IsSet() const {
YQL_ENSURE(Defined());
return Value->index() == 0;
}
const TSet& GetValueSet() const {
YQL_ENSURE(IsSet());
return std::get<TSet>(*Value);
}
const TReset& GetValueReset() const {
YQL_ENSURE(!IsSet());
return std::get<TReset>(*Value);
}
private:
TMaybe<std::variant<TSet, TReset>> Value;
};
template <typename S, typename R>
class TResetableSetting: public TResetableSettingBase<S, R> {
};
template <typename S>
class TResetableSetting<S, void>: public TResetableSettingBase<S, TNothing> {
private:
const TNothing& GetValueReset() const;
public:
void Reset() {
TResetableSettingBase<S, TNothing>::Reset(Nothing());
}
};
}
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