#include <stdlib.h>
#include <stdio.h>

template<typename F, typename... args, typename R>
static R unsafe_c_callback(void* thisptr,args... a) {
    return (*((F*)thisptr))(a...);
}



template<typename F, typename... args, typename R>
static void* C(const F& callback, R(*&fptr)(void*,args...)) {
    fptr = unsafe_c_callback<F,args...>;
    return (void*)&callback;
}
int main(int argc, char** argv) {

    auto bot = [=](const char* txt){
        printf("%s\n",txt);
        return 5;
    };
    int(*fptr)(void*,const char*);
    void* thisptr = C(bot,fptr);
    int rval = fptr(thisptr,"Lambda text");
    printf("%i\n",rval);
return 0;
}