C ++继承出错 [英] C++ inheritance getting error

问题描述

我在弄清楚这个错误时遇到了一些麻烦.所以我有一个Person类和一个Student子类.

I'm having a bit of trouble figuring out this error I have. So I have a Person class, and a Student subclass.

Person类具有以下构造函数:

The Person class has the following constructor:

Person(const string &name)
        {   this->name = name;
        }

Student类具有以下构造函数:

The Student class has the following constructor:

Student::Student(const string &name, int regNo)
{ this->name = name;
  this->regNo = regNo;
}

但是当我尝试编译Student类时，对于构造函数却出现此错误:

When I try to compile the Student class though, I get this error for the constructor:

在构造函数"Student :: Student(const string& ;, int)"中:

In constructor 'Student::Student(const string&, int)':

错误:没有匹配的函数可以调用'Person :: Person()'

error: no matching function for call to 'Person::Person()'

我是C ++的新手，所以我不知道为什么会收到此错误，但显然与Person的继承有关.

I'm new to C++, so I have no idea why I get this error, but it has something to do with the inheritance of Person obviously.

推荐答案

您正试图调用 Person 的默认构造函数，但它没有一个.无论如何，看起来您想要做的就是调用其单参数构造函数:

You are attempting to call Person's default constructor, but it doesn't have one. In any case, it looks like what you want to do is call its single parameter constructor:

Student::Student(const string& name, int regNo) : Person(name), regNo(regNo)
{
}

类似地，在 Person 的构造器中使用构造函数初始化列表:

Similarly, use the constructor initialization list in Person's consructor:

Person(const string& name) : name(name) {}

通过这种方式，您可以将数据成员初始化为所需的值，而不是默认对其进行初始化，然后为其分配新值.

This way, you are initializing your data members to the desired value, instead of default initializing them and then assigning them new values.

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