子类无法访问 C++ 公共(public)非虚拟基类方法

Question

鉴于下面代码段 1 和 2 中的两个类定义，您能否告诉我为什么我会收到第三个代码段中显示的编译错误以及如何修复它们？看起来子类无法访问基类中的非虚公共(public)方法(参见第二个代码片段中标记为第 197 行的子类中的方法 getVipAddress)。我是 C++ 领域的新手，所以如果您碰巧看到代码块中需要任何其他改进，我将不胜感激。

SNIPPET 1(基类和子类)

//基础类

class BaseEntity
{
 public:
BaseEntity(): mUUID(""), mName("") {}
BaseEntity(std::string &uuid, std::string &name): mUUID(uuid), mName(name) { }

BaseEntity (const BaseEntity &copyin)
{
    this->mUUID = copyin.mUUID.c_str();
    this->mName = copyin.mName.c_str();
}

BaseEntity operator = (const BaseEntity &rhs)
{
    this->mUUID = rhs.mUUID.c_str();
    this->mName = rhs.mName.c_str();

    return *this;
}

~BaseEntity() { };

void setUUID(std::string uuid) { mUUID = uuid; }
void setName(std::string name) { mName = name; }

              /*LINE 89 is the following*/
const std::string &getUUID() const { return mUUID; }
const std::string &getName() const { return mName; }

  private:
std::string mUUID;
std::string mName;

};

//子类

class VipAddressSet : BaseEntity
{
  public:
    VipAddressSet() : BaseEntity() { }
    VipAddressSet(std::string &uuid, std::string &name) : BaseEntity(uuid, name) { }

    VipAddressSet(const VipAddressSet &copyin)
    {
            setUUID(copyin.getUUID());
            setName(copyin.getName());

                std::vector<VipAddressEntity>::const_iterator iter;
            for( iter = copyin.mVipAddressList.begin(); iter !=  copyin.mVipAddressList.end(); iter++ )
            {

                addVipAddress(*iter);
            }
     }

     VipAddressSet operator = (const VipAddressSet &rhs)
     {
          setUUID(rhs.getUUID());
          setName(rhs.getName());

              std::vector<VipAddressEntity>::const_iterator iter;
          for( iter = rhs.mVipAddressList.begin(); iter != rhs.mVipAddressList.end(); iter++ )
              {
            addVipAddress(*iter);
          }

          return *this;
         }

     int getVipAddress(std::string &uuid, VipAddressEntity **ptr )
     {
        std::vector<VipAddressEntity>::const_iterator iter;
        for( iter = mVipAddressList.begin(); iter != mVipAddressList.end();  iter++ )
        {
   **/*~~~~ LINE 197 is the following ~~~~*/**
            if(iter->getUUID() == uuid)
            {
                **ptr = *iter;
                return 1;
            }
        }

        return 0;
     }


     const std::vector<VipAddressEntity>& getVipAddressList() const { return mVipAddressList; }


    private:
      std::vector<VipAddressEntity> mVipAddressList;

      void addVipAddress(const VipAddressEntity &entity)
      {
       mVipAddressList.push_back(entity);
      }

     };

编译输出

  $ g++ -g -c -std=c++11 -Wall Entity.hpp
  Entity.hpp: In member function ‘int  ECLBCP::VipAddressSet::getVipAddress(std::string&, ECLBCP::VipAddressEntity**)’:
  Entity.hpp:89:21: error: ‘const string& ECLBCP::BaseEntity::getUUID() const’ is inaccessible
  Entity.hpp:197:24: error: within this context
  Entity.hpp:197:24: error: ‘ECLBCP::BaseEntity’ is not an accessible base of ‘const   ECLBCP::VipAddressEntity’

Answer 1

类的默认继承是私有(private)的。将您的声明更改为

class VipAddressSet : public BaseEntity