在 C++11 中的析构函数之后覆盖标识符
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Override identifier after destructor in C++11
提问by EnterTheNameHere Bohemian
Does the override identifier after virtual destructor declaration have any special meaning?
虚析构函数声明后的覆盖标识符有什么特殊含义吗？
class Base
{
public:
virtual ~Base()
{}
virtual int Method() const
{}
};
class Derived : public Base
{
public:
virtual ~Derived() override
{}
virtual int Method() override // error: marked override, but does not override - missing const
{}
};
Using override identifier on virtual method is useful as check: compiler will report error when the Base virtual method is actualy not overriden.
在虚拟方法上使用覆盖标识符作为检查很有用：当 Base 虚拟方法实际上没有被覆盖时，编译器将报告错误。
Does override on virtual destructor has any meaning/function too?
覆盖虚拟析构函数是否也有任何意义/功能？
采纳答案by John Dibling
It is not overridethat has special meaning, but the destructor itself:
不是override它有特殊意义，而是析构函数本身：
10.3 Virtual Functions
10.3 虚拟功能
6/Even though destructors are not inherited, a destructor in a derived class overrides a base class destructor declared virtual; see 12.4 and 12.5.
6/即使析构函数没有被继承，派生类中的析构函数会覆盖声明为虚拟的基类析构函数；见 12.4 和 12.5。
If you take this in conjunction with the previous clause:
如果您将其与上一条一起考虑：
5/If a virtual function is marked with the virt-specifier override and does not override a member function of a base class, the program is ill-formed. [ Example:
struct B { virtual void f(int); }; struct D : B { void f(long) override; // error: wrong signature overriding B::f void f(int) override; // OK };—end example ]
5/如果一个虚函数被标记为virt-specifier override，并且没有重写基类的成员函数，那么程序就是格式错误的。[ 例子：
struct B { virtual void f(int); }; struct D : B { void f(long) override; // error: wrong signature overriding B::f void f(int) override; // OK };—结束示例]
you can see that if a destructor is marked overridebut the base class does not have a virtualdestructor, the program is ill-formed.
您可以看到，如果标记了析构函数override但基类没有virtual析构函数，则程序格式错误。
回答by Mankarse
Yes. If the base destructor is not virtual then the overridemarking will cause the program to not compile:
是的。如果基础析构函数不是虚拟的，那么override标记将导致程序无法编译：
class Base
{
public:
~Base()
{}
};
class Derived : public Base
{
public:
virtual ~Derived() override //error: '~Derived' marked 'override' but does
// not override any member functions
{}
};
