#include <iostream>
using namespace std;
struct VExtension {}; 
typedef bool (func_t)(int const& a, void* const& b, VExtension* const& v);
 
bool func(int const& a, void* const& b, VExtension* const& v)
{
    std::cout << a <<"-" << b << std::endl;
}
 
 
extern "C" int extension_init(func_t*, VExtension*);
 
int main(int argc, char** argv)
{
    VExtension ve;
    extension_init(&func, &ve);
    return 0;
}
 
extern "C" int extension_init(func_t* F, VExtension* v)
{
    intptr_t ver = 7;
    F(1, (void*)ver, v);
}

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