指针与参考 [英] Pointer vs. Reference
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问题描述
当给一个函数使用原始变量时,更好的做法是:
unsigned long x = 4;
void func1(unsigned long& val){
val = 5;
}
func1(x);
或:
code> void func2(unsigned long * val){
* val = 5;
}
func2(& x);
IOW:有理由选择另一个吗?
<我的经验法则是:
如果你想和指针进行指针运算,使用指针(例如:
否则使用引用。
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);
or:
void func2(unsigned long* val) {
*val = 5;
}
func2(&x);
IOW: Is there any reason to pick one over another?
解决方案
My rule of thumb is:
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.
Use references otherwise.
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