C++ SoftPtr example

ex.cpp

#include <functional>
#include <stdio.h>

template <class T> class SoftPtr {
public:
  SoftPtr(T *inner) { this->inner = inner; }

  SoftPtr<T> operator*() { return SoftPtr(this->inner); }

  void use(std::function<void(T &)> code) {
    // disable preemption, make rcu_reader, etc.
    code(*inner);
  }

private:
  T *inner;
};

class Foo {
public:
  Foo() {}

  int say() { return 42; }
};

int main() {
  Foo f;
  SoftPtr<Foo> x(&f);

  // doesn't compile:
  // Foo &a = *x;

  SoftPtr<Foo> y = *x;

  y.use([](Foo &a) -> void { a.say(); });
}