错误C2797：成员初始化列表中的列表初始化 [英] error C2797 : list initialization inside member initializer list

问题描述

我在看 MVA的C ++教程和下面提到的代码是由Kate不是我写的。但是她似乎没有编译显示任何错误，但在我的情况下，我得到以下错误：

错误1错误C2797： 'NamedRectangle :: _ name'：列表初始化
在成员初始化程序列表或非静态数据成员初始化程序
未实现c：\users\abhimanyuaryan\documents \visual studio
2013 \projects\kate demos\17
inheritance\inheritance\\\
amedrectangle.h 12 1继承

代码中的第12行来自我的 NameRectangle 类，继承自 Rectangle class：

class NamedRectangle：public Rectangle
{
public：
NamedRectangle（）{}

NamedRectangle （std :: string initial_name，int initial_width，int initial_height）
：Rectangle {initial_width，initial_height}，_name {initial_name} // - >这行
{}

std :: string get_name（）const {return _name; }

private：
std :: string _name;

};


当我删除 std :: string 从构造函数以及 _name {initial_name} 代码编译。请解释我，不要把我当一个更高标准的有经验的程序员。我昨天才开始C ++。

解决方案

James和我写了我们用于MVA日期和今天的代码时，编译器发生了变化。正在发生的是

  _name {initial_name} 
  

被解释为创建一个初始化列表，其中有一个项目，并使用它来初始化成员变量。

修正是切换到圆括号：

 
 code> _name（initial_name）
  

这是造成一些人的困惑，至少有一个客户端为此打破了工作代码。

I was watching MVA's tutorial on C++ and the code I'm mentioning below is written by Kate not me. However she seems to get around with it without compiling showing any error but in my case I get the following error:

Error 1 error C2797: 'NamedRectangle::_name': list initialization inside member initializer list or non-static data member initializer is not implemented c:\users\abhimanyuaryan\documents\visual studio 2013\projects\kate demos\17 inheritance\inheritance\namedrectangle.h 12 1 Inheritance

Line 12 in the code is from my NameRectangle class which inherits from Rectangle class:

class NamedRectangle :  public Rectangle
{
public:
    NamedRectangle() { }

    NamedRectangle(std::string initial_name, int initial_width, int initial_height)
        : Rectangle{ initial_width, initial_height }, _name{ initial_name } //--> This line
    {}  

std::string get_name() const { return _name; }

private:
    std::string _name;

};

when I remove std::string initial_name from constructor as well as _name{initial_name} the code compiles. Please explain me with not taking me as a higher standard experienced programmer. I started C++ yesterday only.

解决方案

There was a compiler change between the time James and I wrote the code we used for the MVA day and today. What's happening is that

 _name{ initial_name }

is being interpreted as creating an initializer-list with one item in it and using that to initialize the member variable. Which you can't do.

The fix is to switch to round brackets:

 _name(initial_name)

This is causing confusion for a number of people and I have at least one client for whom this broke working code.

这篇关于错误C2797：成员初始化列表中的列表初始化的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！