构造器初始化列表评估顺序 [英] Constructor initialization-list evaluation order
问题描述
我有一个构造函数,需要一些参数。我假设他们是按照列出的顺序建造的,但在一种情况下,它们似乎被反向构建,导致中止。当我扭转参数时,程序停止中止。这是我使用的语法的一个例子。事情是,在这种情况下,a_需要在b_之前初始化。你能保证施工的顺序吗?
I have a constructor that takes some arguments. I had assumed that they were constructed in the order listed, but in one case it appears they were being constructed in reverse resulting in an abort. When I reversed the arguments the program stopped aborting. This is an example of the syntax I'm using. The thing is, a_ needs to be initialized before b_ in this case. Can you guarantee the order of construction?
例如
class A
{
public:
A(OtherClass o, string x, int y) :
a_(o), b_(a_, x, y) { }
OtherClass a_;
AnotherClass b_;
};
推荐答案
这取决于成员变量声明的顺序类。因此, a _
将是第一个,然后 b _
将是您示例中的第二个。
It depends on the order of member variable declaration in the class. So a_
will be the first one, then b_
will be the second one in your example.
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