c++ 构造函数后加冒号作用（The c++ constructor is followed by a colon）.docVIP

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c++ 构造函数后加冒号作用（The c++ constructor is followed by a colon）.doc

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c构造函数后加冒号作用（Thecconstructorisfollowedbyacolon）

c++ 构造函数后加冒号作用（The c++ constructor is followed by a colon） Baidu know computer / Network C/C++ programming language The back of a constructor to ask the C++ in a colon is what mean 2008-11-06 12:56 AAA | meteor classification: C/C++ | browse 5354 For this example: #includeiostream.hclass A int {public: X; A (int a=0 {x=a});}}; class B1:publicA{public; int Y1; B1 (int a=0, int b=0): A (b) / / is this sentence {y1=a}};; the sentence: A (b) on behalf of what ah as to what, with a B1 base class constructor?? Thank you A (b) is actually doing is initialized with B members of the A X; both x=b; is the initializer list, I suggest you look at the relevant chapters come to understand.B1 (int a=0, int b=0): A (b) / / is this sentence {y1=a;} in fact can be written as B1 (int a=0, int b=0): A (b), Y1 (a) {} This is the initialization list, if you did not understand this, to inherit, it will definitely not easy to understand! The C++ constructor with a colon In fact, after the colon is the content of the initializer list, there are three cases: 1, the object contains a member of an object is initialized, for example, Line has two private object members startpoint, endpoint, line in the constructor: Line (int SX, int sy, int ex, int ey): startpoint (SX, SY), endpoint (ex, ey) {...... } According to the object constructor class definition of the members of the order were calling their object initialization, and then execute its own constructor 2, the object does not contain a member of an object, the initialization can also apply the above format, for example, The rectangle class has two data members: length, width, the constructor: (rectangle): length (1), width (2) {} Rectangle (int x, int y): length (x), width (y) {} 3, the parent class is initialized, for example, CDlgCalcDlgs father is MFC CDialog, the constructor for writing: CDlgCalcDlg (CWnd* pParent): CDialog (CDlgCalcDlg:: IDD, pParent) Where IDD is an enumeration element, Symbol dialog box template ID The object is