返回信息流class a
{
public:
a(){cout<<"a+"<<endl;}
~a(){cout<<"a-"<<endl;}
};
class b:virtual public a
{
public:
b(){cout<<"b+"<<endl;}
~b(){cout<<"b-"<<endl;}
};
class c:virtual public a
{
public:
c(){cout<<"c+"<<endl;}
~c(){cout<<"c-"<<endl;}
};
class d: public c, public b
{
public:
d(){cout<<"d+"<<endl;}
~d(){cout<<"d-"<<endl;}
};
调用d时，析构顺序是 a+c+b+d+
为什么把d的定义改了一下如：class d: public c, virtual public b
顺序就变成了a+b+c+d+了呢？
这是一条镜像帖。来源：北邮人论坛 / soft-design / #16565同步于 2007/4/10
该镜像源已超过 30 天没有更新，可能在源站已被删除。
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问一个C++析构函数的问题
itrt
2007/4/10镜像同步5 回复
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5 条回复
好久不看忘记了，这记性.....
Sigh...
cpp standard 12.6.2-5
Initialization shall proceed in the following order:
— First, and only for the constructor of the most derived class as described below, virtual base classes shall be initialized in the order they appear on a depth-first left-to-right traversal of the directed acyclic graph of base classes, where “left-to-right” is the order of appearance of the base class names in the derived class base-specifier-list
— Then, direct base classes shall be initialized in declaration order as they appear in the base-specifier-list (regardless of the order of the mem-initializers).
— Then, nonstatic data members shall be initialized in the order they were declared in the class definition (again regardless of the order of the mem-initializers).
— Finally, the body of the constructor is executed.
【 在 PomLover (PomLover) 的大作中提到: 】
: C++是先按顺序构造虚基类，再按顺序构造非虚基类～