c++ - How to call a function using an argument supplied from the template function -

edit: clarify "t" called when casted. compiler knows , state function pointer takes argument of type int. supply null int pointer break loop because calling recursively. may bug in compiler.

i trying call function template function argument. assume possible call function without explicit casting not seem case. using vc2013.

template<typename t> void func(t t) {      printf("calling func...\n");      if (t)     {         ((void(__cdecl*)(int))t)((int)nullptr);     // explicit casting successful          t ((int)nullptr);                           // compile error: ``term not evaluate function taking 1 arguments``      }  }  void main() {      auto pe = func < int > ;     auto pf = func < void(__cdecl*)(int) >;      pf(pe);   } 

you have error func<int> becomes:

void func(int t) {     printf("calling func...\n");      if (t)     {         ((void(__cdecl*)(int))t)((int)nullptr); // bad casting         t ((int)nullptr);                       // compile error: int not callable object     } }