luau/tests/ScopedFlags.h

// This file is part of the Luau programming language and is licensed under MIT License; see LICENSE.txt for details
#pragma once

#include "Luau/Common.h"

#include <string.h>

template<typename T>
struct [[nodiscard]] ScopedFValue
{
private:
    Luau::FValue<T>* value = nullptr;
    T oldValue = T();

public:
    ScopedFValue(Luau::FValue<T>& fvalue, T newValue)
    {
        value = &fvalue;
        oldValue = fvalue.value;
        fvalue.value = newValue;
    }

    ScopedFValue(const ScopedFValue&) = delete;
    ScopedFValue& operator=(const ScopedFValue&) = delete;

    ScopedFValue(ScopedFValue&& rhs)
    {
        value = rhs.value;
        oldValue = rhs.oldValue;

        rhs.value = nullptr;
    }

    ScopedFValue& operator=(ScopedFValue&& rhs)
    {
        value = rhs.value;
        oldValue = rhs.oldValue;

        rhs.value = nullptr;

        return *this;
    }

    ~ScopedFValue()
    {
        if (value)
            value->value = oldValue;
    }
};

using ScopedFastFlag = ScopedFValue<bool>;
using ScopedFastInt = ScopedFValue<int>;