指针与引用

2021-12-13 00:00:00 reference pointers variables c++

在为函数提供要使用的原始变量时有什么更好的做法:

What would be better practice when giving a function the original variable to work with:

unsigned long x = 4;

void func1(unsigned long& val) {
     val = 5;            
}
func1(x);

或:

void func2(unsigned long* val) {
     *val = 5;
}
func2(&x);

IOW:有什么理由选择一个?

IOW: Is there any reason to pick one over another?

推荐答案

我的经验法则是:

如果您想用指针进行指针运算(例如，递增指针地址以遍历数组)或者您必须传递 NULL 指针，请使用指针.

Use pointers if you want to do pointer arithmetic with them (e.g. incrementing the pointer address to step through an array) or if you ever have to pass a NULL-pointer.

否则使用引用.

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