错误C2614：'ChildClass'：非法成员初始化：'var1'不是基础或成员

问题描述

我在C ++中收到以下错误：

I am getting the following error in C++:

Class Base 
{
    protected:
    int var1;
public:
    Base()
    {
        var1=0;
    }
}


class Child : public Base
{
    int chld;
    public: 
    Child() : var1(0)
    {
        chld=1;
    }
}

我觉得我所做的是根据OO协议。
这里 var1 是Base类的数据成员，protected作为访问说明符。所以它可以被继承，它会变成私人的孩子。

I feel what I have done is as per OO protocol. Here var1 is a data member of Base class with protected as the access specifier. So It can be inherited and it would become private in child.

不明白我为什么会收到错误？

推荐答案

它不能用于错误消息为您提供的确切原因：您只能将初始化程序列表与直接成员或基类一起使用。

It doesn't work for the exact reason the error message provides you: you can only use initializer lists with direct members or base classes.

在你的情况下，你甚至不需要初始化 var1 ，因为 Base :: Base（）将是由 Child 的构造函数调用，它将 var1 设置为 0 。

In your case, you don't even need to initialize var1, since Base::Base() will be called by Child's constructor, which will set var1 to 0.

如果你想要一个不同的值，你必须重载 Base 构造函数并明确地调用它：

If you want a different value, you'll have to overload Base constructor and call it explicitly:

class Base 
{
protected:
     int var1;
public:
     Base() : var1(0)
     {
     }
     Base(int x) : var1(x)
     {
     }
};

class Child:public Base
{
    int chld;
public: 
    Child(): Base(42) , chld(1)
    {
    }
};

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