c++ - 为什么在 C++ 中使用按值调用？

Question

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Answer 1

我保存的摘录，您可能会觉得有用(来自 CodingUnitTutorials )

There are two possible reasons to not use call-by-reference: side effects and privacy. Unwanted side effects are usually caused by inadvertently changes that are made to a call by reference parameter. Also in most cases you want the data to be private and that someone calling a function only be able to change if you want it. So it is better to use a call by value by default and only use call by reference if data changes are expected.