有没有办法实现Python的'separator'.join（）在C ++的模拟？ [英] Is there a way to implement analog of Python's 'separator'.join() in C++?

问题描述

所有我找到的是 boost :: algorithm :: string :: join 。然而，似乎过度使用Boost只为加入。那么也许有一些经过时间考验的食谱？

All I've found is boost::algorithm::string::join. However, it seems like overkill to use Boost only for join. So maybe there are some time-tested recipes?

UPDATE ：

对不起，问题标题不好。
我正在寻找方法来连接字符串与分隔符，而不只是逐个连接。

UPDATE:
Sorry, the question caption were bad. I'm looking for method to concatenate strings with separator, not just to concatenate one-by-one.

推荐答案

由于您正在寻找食谱，请继续使用Boost的。一旦你超越了所有的一般性，它不是太复杂：

Since you're looking for a recipe, go ahead and use the one from Boost. Once you get past all the genericity, it's not too complicated:

1. 分配一个地方来存储结果。


2. 将序列的第一个元素添加到结果中。


3. 当有其他元素时，将分隔符和下一个元素追加到结果中。


4. 返回结果。

1. Allocate a place to store the result.
2. Add the first element of the sequence to the result.
3. While there are additional elements, append the separator and the next element to the result.
4. Return the result.

这里有一个版本可以在两个迭代器上工作

Here's a version that works on two iterators (as opposed to the Boost version, which operates on a range.

template <typename Iter>
std::string join(Iter begin, Iter end, std::string const& separator)
{
  std::ostringstream result;
  if (begin != end)
    result << *begin++;
  while (begin != end)
    result << separator << *begin++;
  return result.str();
}

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