//-----------'Optimized' version

#include <iostream>

class Thing {
   public:
      int getX() const;
      void setX(const int x);
   private:
      int x;
};

inline int Thing::getX() const {
   return x;
}

inline void Thing::setX(const int x) {
   this->x = x;
}

inline void printMe(const Thing& thing) {
   std::cout << thing.getX() << "\n";
}

int main() {
   Thing thing;
   thing.setX(123);
   printMe(thing);
}


//-------------Lazy programmer

#include <iostream>

class Thing {
   public:
      int getX() ;
      void setX(int x);
   private:
      int x;
};

inline int Thing::getX() {
   return x;
}

inline void Thing::setX(int x) {
   this->x = x;
}

inline void printMe(Thing thing) {
   std::cout << thing.getX() << "\n";
}

int main() {
   Thing thing;
   thing.setX(123);
   printMe(thing);
}