const_iterator
和 iterator
之间有什么区别,你会在哪里使用它们?
What is the difference between a const_iterator
and an iterator
and where would you use one over the other?
const_iterator
s 不允许您更改它们指向的值,常规 iterator
s做.
const_iterator
s don't allow you to change the values that they point to, regular iterator
s do.
与 C++ 中的所有东西一样,总是更喜欢 const
,除非有充分的理由使用常规迭代器(即您想使用它们不是 const
更改指向的值).
As with all things in C++, always prefer const
, unless there's a good reason to use regular iterators (i.e. you want to use the fact that they're not const
to change the pointed-to value).
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