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#include <utility>
 
template<typename F>
class A {
public:
  A(const F& f) : _f(f) {}
  A(F&& f) : _f(std::move(f)) {}
 
private:
  F _f;
};
 
template<typename F>
A<F> MakeA(F&& f) {
  return A<F>(std::forward<F>(f));
}
 
void foo() {}
 
int main() {
	auto a = MakeA([]{}); // OK
	auto b = MakeA(&foo); // OK
	auto c = MakeA(foo);  // <-- Error with overloading
}

prog.cpp: In instantiation of ‘class A<void (&)()>’:
prog.cpp:23:20:   required from here
prog.cpp:7:3: error: ‘A<F>::A(F&&) [with F = void (&)()]’ cannot be overloaded
   A(F&& f) : _f(std::move(f)) {}
   ^
prog.cpp:6:3: error: with ‘A<F>::A(const F&) [with F = void (&)()]’
   A(const F& f) : _f(f) {}
   ^

Standard output is empty