多个变量的C ++初始化列表 [英] C++ initialization lists for multiple variables

问题描述

我正在尝试学习如何初始化列表。

I'm trying to learn how to initialize lists.

我下面有一个简单的类，试图初始化变量列表。第一个 Month（int m）：month（m）有效。我正在尝试使用多个变量在该行下执行类似的操作。是否可以这种格式？我会不得不摆脱那种班轮吗？

I have a simple class below and trying to initialize the list of variables. The first Month(int m): month(m) works. I'm trying to do something similar below that line with more than one variable. Is this possible in that format? would I have to break away from the one liner?

class Month
{
public:
    Month(int m) : month(m) {} //this works
    Month(char first, char second, char third) : first(first){} : second(second){} : third(third){} //DOES NOT WORK
    Month();
    void outputMonthNumber(); //void function that takes no parameters
    void outputMonthLetters(); //void function that takes no parameters
private:
    int month;
    char first;
    char second;
    char third;
};

很明显，我不太了解如何执行此操作，任何指导将不胜感激，谢谢

Obviously I don't have much clue how to do this, any guidance would be appreciated, thanks

推荐答案

尝试一下：

  Month(char first, char second, char third) 
     : first(first), second(second), third(third) {} 

[您可以单行执行此操作。我将其拆分只是为了演示。]

[You can do this as a single line. I've split it merely for presentation.]

空括号{}是构造函数的主体，在这种情况下为空。

The empty braces {} are the single body of the constructor, which in this case is empty.

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