closure.cpp

#include <qdebug.h>

template <typename T> class Runner;
template <typename T> Runner<T> Closure(T t) { return Runner<T>(t); }
template <typename T> class Runner
{
    friend Runner<T> Closure <> (T t);
    Runner(T t) : _t (t) {}
    T _t;
public:
    virtual void exec(float f) { _t(f); }
};



void strategy_function(int i, float f)
{
    qDebug() << Q_FUNC_INFO << i << "," << f;
}



int main(int , char *[])
{
    int i = 66;

    auto callback = Closure([=](float y)
        {
            return strategy_function(i, y);
        });

    i = 33;
    callback.exec(3.14);

    return 0;
}