[英]What's the difference between “&” in this program
Below is part of a C++ program: 以下是C ++程序的一部分:
Circle circle1, &circle2 = circle1, *p = &circle2;
I'm wondering what is the difference in between the two &
s there? 我不知道是什么在两者之间的区别
&
在那儿? Thanks so much. 非常感谢。
第一(使用&
)的声明一个圆参考,后者是用于获得的存储器地址的地址的操作者circle2
。
Circle circle1, &circle2 = circle1, *p = &circle2;
is equivalent to: 等效于:
Circle circle1;
Circle &circle2 = circle1; // & is used to declare a reference variable
Circle *p = &circle2; // & is used to take the address of circle2
They have two very different meanings. 它们有两个非常不同的含义。 Its easier to see if you split up the terms.
如果您拆分条款,则更容易看到。
Circle circle1; // A Circle object
Circle& circle2 = circle1; // A Circle reference
Circle* p = &circle2; // A Circle pointer takes the address of a Circle object
In the second line you are declaring a reference to a Circle
. 在第二行中,您声明对
Circle
的引用 。
In the third line you are taking the address of a Circle
. 在第三行中,您使用的是
Circle
的地址 。
So the second line is using &
to declare a reference type . 因此,第二行使用
&
声明引用类型 。
The third line is using &
as the address of operator. 第三行使用
&
作为运算符的地址 。
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