如何指定继承类的构造函数定义？

Question

我有一个基类（头）：

class BaseClass 
{ 
    public: 
     BaseClass(int); // note no default constructor. 
} 

并派生它的类：

class DerivedClass : public BaseClass 
{ 
    public: 
     DerivedClass(void); 
} 

DerivedClass::DerivedClass (void) // note SPECIFICALLY no parameters. 
{ 
    super (10); // equivalent of what I am trying to do in Java (I think) 
} 

如何调用继承类的构造函数在我的派生类？

Answer 1

这样的：

DerivedClass::DerivedClass (void) : BaseClass(10) 
{ } 

注意：如果你不熟悉的语法，寻找出成员初始化列表。

Answer 2

这是你想要什么：

DerivedClass(void):BaseClass(10) { 
    //blah blah blah 
} 

Answer 3

class BaseClass 
{ 
    public: 
     BaseClass(int) {}; 
} ; 
class DerivedClass : public BaseClass 
{ 
    public: 
     DerivedClass(void); 
}; 

DerivedClass::DerivedClass (void) 
:BaseClass(10) 
{ 

}