C ++流混乱：istreambuf_iterator vs istream_iterator？ [英] C++ streams confusion: istreambuf_iterator vs istream_iterator?

问题描述

istreambuf_iterator 和 istream_iterator 之间有什么区别？
和一般stream和streambufs之间的区别是什么？
我真的找不到任何清楚的解释，所以决定这里问。

What is the difference between istreambuf_iterator and istream_iterator? And in general what is the difference between streams and streambufs? I really can't find any clear explanation for this so decided to ask here.

推荐答案

IOstreams使用streambufs作为其输入/输出的源/目标。有效地，streambuf-family做所有关于IO的工作，IOstream-family只用于格式化和字符串/字符串转换。

IOstreams use streambufs to as their source / target of input / output. Effectively, the streambuf-family does all the work regarding IO and the IOstream-family is only used for formatting and to-string / from-string transformation.

现在， a href =http://en.cppreference.com/w/cpp/iterator/istream_iterator> istream_iterator 采用模板参数，说明未格式化来自streambuf的字符串序列应该格式化为，像 istream_iterator< int> 会将所有传入的文本解释为（$空格分隔） int s。

Now, istream_iterator takes a template argument that says what the unformatted string-sequence from the streambuf should be formatted as, like istream_iterator<int> will interpret (whitespace-delimited) all incoming text as ints.

另一方面， istreambuf_iterator 只关心原始字符，并直接在 istream 的相关streambuf上进行迭代

On the other hand, istreambuf_iterator only cares about the raw characters and iterates directly over the associated streambuf of the istream that it gets passed.

一般来说，如果你只对原始字符感兴趣，可以使用 istreambuf_iterator 。如果您对格式化的输入感兴趣，请使用 istream_iterator 。

Generally, if you're only interested in the raw characters, use an istreambuf_iterator. If you're interested in the formatted input, use an istream_iterator.

我所说的也适用于 ostream_iterator 和 ostreambuf_iterator 。

All of what I said also applies to ostream_iterator and ostreambuf_iterator.

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