此功能顶部的功能 [英] What is going on at the top of this function

问题描述

我目前正在看一个函数示例，我似乎无法在Visual C ++中使用MFC弄清楚.功能如下

I'm currently looking at a function example that I can't seem to figure out using MFC in Visual C++. The function is as follows

CMFC_OSG_MDIView::CMFC_OSG_MDIView() :mOSG(0L)
{
}

我了解这里的所有内容，除了mOSG(0L)代码段.在MFC_OSG _MDIView类中声明了mOSG，如下所示:

I understand everything here except the mOSG(0L) snippet. mOSG was declared in the MFC_OSG _MDIView class as follows:

cOSG* mOSG;

推荐答案

CMFC_OSG_MDIView::CMFC_OSG_MDIView() :mOSG(0L)
{
}

上面是一个名为 CMFC_OSG_MDIView 的类的构造函数.:mOSG(0L)称为 initializer list ，在创建对象时执行.初始化列表在构造函数的主体之前被调用，它是初始化成员变量的正确位置.

The above is a constructor, for a class called CMFC_OSG_MDIView. :mOSG(0L) is called initializer list, which is executed when an object is created. The init-list gets called before the body of the constructor, and it is the correct place to initialize the member variables.

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