#include <functional>
#include <iostream>
 
class TestClass {
 private:
  int i;
 public:
  TestClass(int i_): i(i_) {}
  void func0() const { std::cout << "func0: " << i << std::endl; }
  void func1() {
    i += 1;
    std::cout << "func1: " << i << std::endl;
  }
};
 
int main() {
  std::function<void (const TestClass&)> f0 = &TestClass::func0;
  std::function<void (TestClass&)> f1 = &TestClass::func1;
 
  TestClass c10(10);
  f0(c10);
  f1(c10);
 
  TestClass c100(100);
  f0(c100);
  f1(c100);
}

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