C++如何使用const将接口传递给Class方法

Question

在使用Visual Studio 2008的本机C++中,如何使用const将接口传递给类成员？执行以下操作会导致此错误:

错误C2662:'IMyInterface :: PublicMember1'无法将'this'指针从'const IMyInterface'转换为'IMyInterface'

class IMyInterface
{
  virtual std::wstring PublicMember1() = 0;
  virtual int PublicMember2() = 0;
  virtual void Update(const IMyInterface & myObject) = 0;
}

class MyClass : public IMyInterface
{
   private:
      std::wstring privateMember1;
      int privateMember2;
   public:
      virtual std::wstring PublicMember1() { return privateMember1; }
      virtual int PublicMember2() { return privateMember2; }
      virtual void Update(const IMyInterface & myObject);
}

void MyClass::Update(const IMyInterface& myObject)
{
     privateMember1 = myObject.PublicMember1();
     privateMember2 = myObject.PublicMember2();
}

Answer 1

声明接口所需的方法为 const

class IMyInterface
{
  virtual std::wstring PublicMember1() const = 0;
  virtual int PublicMember2() const = 0;
  virtual void Update(const IMyInterface & myObject) = 0;
}