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#include <iostream>
using namespace std;
 
struct Foo{
  Foo(int v) : value(v) {}
  int value;
};
 
template<class T, T(*F)()>
struct V {
  static const T s_default = F();
};
 
Foo default_foo()  { return Foo(3); }
 
struct FooContainer : public V<Foo, default_foo> {
};
 
int main() {
  // your code goes here
  return 0;
}

prog.cpp: In instantiation of ‘struct V<Foo, default_foo>’:
prog.cpp:16:30:   required from here
prog.cpp:11:18: error: in-class initialization of static data member ‘const Foo V<Foo, default_foo>::s_default’ of non-literal type
   static const T s_default = F();
                  ^~~~~~~~~

Standard output is empty