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#include <iostream>
#include <functional>
 
class VoidType{
 
public:
	template<class ...Arge>
	virtual int operator()(Arge ...Arges){return 0; }//戻り型がチープ。継承先の戻り型を設定したい。
};
 
 
template<class F>
class AnyFunction:VoidType{
	std::function<F> Fun;
 
public:
	AnyFunction(std::function<F> F){
		Fun = F;
	}
	AnyFunction() = delete;
 
	template<class ...Arge>
	typename std::function<F>::result_type operator ()(Arge ...Arges){
		return Fun(Arges...);
	}
};
 
int main(){
	AnyFunction<int(int)> F([](int N)->int{std::cout << N << std::endl; return N; });
	VoidType& Fn = F;
	int R = Fn(10);
 
 
	return 0;
}

prog.cpp:8:2: error: templates may not be ‘virtual’
  virtual int operator()(Arge ...Arges){return 0; }//戻り型がチープ。継承先の戻り型を設定したい。
  ^
prog.cpp:8: confused by earlier errors, bailing out
Preprocessed source stored into /home/GDRMha/cciVKy2q.out file, please attach this to your bugreport.

Standard output is empty