Is there equivalent of <? extends T>, <? super T> in C++?

Question

1. Is there equivalent of , in C++?

2. Also, does ,

Answer 1

This worked for me:

#include 

class MyBase {}; 
class A : public MyBase {};    
class B {};

template 
typename std::enable_if::value>::type
Foo(T &v) {
    std::cout << "Foo 1" << std::endl;
}

template 
typename std::enable_if::value>::type
Foo(T &v) {
    std::cout << "Foo 2" << std::endl;
}

int main() {
  A a;
  B b;
  Foo(a);
  Foo(b);
  return 0;
}