How to implement an interface in C++?

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// This is the interface class. It declares the methods that must be
// implemented by any class that implements the interface.
class IMyInterface {
 public:
  virtual void Method1() = 0;
  virtual int Method2(int x) = 0;
};

// This is a class that implements the IMyInterface interface.
class MyClass : public IMyInterface {
 public:
  void Method1() override {
    // Implementation for Method1 goes here.
  }

  int Method2(int x) override {
    // Implementation for Method2 goes here.
    return x + 1;
  }
};

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IMyInterface* myInterface = new MyClass();
myInterface->Method1();
int result = myInterface->Method2(5);