& 是什么意思?在 C++ 中?
我想知道 & 的意思在下面的例子中:
I want to know the meaning of & in the example below:
class1 &class1::instance(){
///something to do
}
推荐答案
这意味着您的方法返回一个引用到一个 method1 对象.引用就像指针一样，它指向对象而不是它的副本，但与指针的区别在于引用:
This means your method returns a reference to a method1 object. A reference is just like a pointer in that it refers to the object rather than being a copy of it, but the difference with a pointer is that references:
- 永远不能是未定义的/NULL
- 你不能用它们做指针运算
所以它们是一种轻量级、更安全的指针版本.
So they are a sort of light, safer version of pointers.
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