Is there any way to extend the lifetime of a temporary object in C++?

I wrote a scope guard which resets a value when the scope exits:

template <class T>
struct ResetGuard
{
    T old_value;
    T& obj_to_reset;
    ResetGuard(T& obj_to_reset, const T& new_value) :
        old_value(obj_to_reset),
        obj_to_reset(obj_to_reset)
    {
        obj_to_reset = new_value;
    }

    ~ResetGuard() { obj_to_reset = old_value; }
};

When this scope guard is returned from a function, is there any way to prevent the immediate destruction of the scope guard if it wasn't saved?

For example:

int GLOBAL_VALUE = 0;
ResetGuard<int> temporarily_set_global_value(int new_val) {
    return { GLOBAL_VALUE, new_val }; //updates the global variable
}
void foo() {
    //Ideally, someone calling this function
    //Wouldn't have to save the returned value to a local variable
    temporarily_set_global_value(15);
    std::cout << "GLOBAL_VALUE is " << GLOBAL_VALUE << std::endl;
}