#include <iostream>

class debug
{
private:
    class base_var
    {
    };

public:
    template<typename T>
    class var : public base_var
    {
    public:
        var(const T& value)
            : m_value(value)
        {
        }

        inline var& operator=(const T& value)
        {
            if ((m_value = value) > m_th)
                std::cerr << "var raised above treshold (" << m_value << " > " << m_th << ")" << std::endl;
        }

        operator T() const
        {
            return m_value;
        }

        void notify_above(T treshold)
        {
            m_th = treshold;
        }

    private:
        T m_value;

        T m_th;
    };
};

int main(void)
{
    debug::var<int> i = 0;
    i.notify_above(1000);

    for (int k = 0; k <= 1000; ++k)
        i = k;

    i = 1337;

    int unwatched_var = i;
    std::cout << "var = " << unwatched_var << std::endl;

    return 0;
}