在C++中,派生類可以繼承基類的成員,包括數(shù)據(jù)成員和成員函數(shù)。對(duì)于派生類訪問(wèn)基類成員的權(quán)限,可以通過(guò)訪問(wèn)修飾符進(jìn)行控制,主要有以下幾種情況:
class Base {
public:
int publicMember;
protected:
int protectedMember;
private:
int privateMember;
};
class Derived : public Base {
// publicMember在Derived中仍然為public權(quán)限
// protectedMember在Derived中變?yōu)閜rotected權(quán)限
// privateMember在Derived中無(wú)法直接訪問(wèn)
};
class Base {
public:
int publicMember;
protected:
int protectedMember;
private:
int privateMember;
};
class Derived : protected Base {
// publicMember和protectedMember在Derived中變?yōu)閜rotected權(quán)限
// privateMember在Derived中無(wú)法直接訪問(wèn)
};
class Base {
public:
int publicMember;
protected:
int protectedMember;
private:
int privateMember;
};
class Derived : private Base {
// publicMember、protectedMember和privateMember在Derived中都變?yōu)閜rivate權(quán)限
};
總的來(lái)說(shuō),派生類的訪問(wèn)權(quán)限取決于繼承方式(公有、保護(hù)、私有)以及基類成員本身的訪問(wèn)權(quán)限。在使用派生類時(shí),需要根據(jù)具體情況選擇合適的繼承方式和訪問(wèn)權(quán)限,以確保代碼的正確性和安全性。