关于基类在派生类初始化 [英] About base class in derived class initialization

问题描述

家伙。我看到几个例子：

guys. I see several cases like:

class Derived:public Base{

public:
    Derived(...):Base(...){}
}

什么情况或有什么原则，我们应该显式初始化基地在Derived ctor初始化列表？感谢

Is what situation or is there any principle that we should explicitly initialize the Base in the Derived ctor initialization list? Thanks

推荐答案

如果我们需要将派生构造函数的参数传递给基础构造函数，那么可以使用它。

In case if we need to pass the arguments of derived constructor to the base constructor, it can be used.

class foo
{
    public:
        foo() {} 
        foo( int num ) {}
};

class bar : public foo
{
    public:
        bar(int barNum): foo(barNum) {}
};

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