gistfile1.cpp

#include <functional>
#include <iostream>


class C
{
public:
  C() : i_() {}
  std::function<void(int)> set = [this](int i) mutable { this->i_ = i; };
  std::function<int()>     get = [this]() { return this->i_; };
  int i_;
};

int main()
{
  C c;
  c.set(42);
  std::cout << c.get() << std::endl;
}