是否有一个C ++迭代器可以逐行迭代文件？ [英] Is there a C++ iterator that can iterate over a file line by line?

问题描述

我想得到一个istream_iterator风格的迭代器，返回文件的每一行作为字符串，而不是每个单词。这是可能吗？

I would like to get an istream_iterator-style iterator that returns each line of the file as a string rather than each word. Is this possible?

推荐答案

EDIT： =http://stackoverflow.com/questions/1567082/how-do-i-iterate-over-cin-line-by-line-in-c/1567703#1567703>在以前的线程。

This same trick was already posted by someone else in a previous thread.

很容易有 std :: istream_iterator 执行您想要的操作：

It is easy to have std::istream_iterator do what you want:

namespace detail 
{
    class Line : std::string 
    { 
        friend std::istream & operator>>(std::istream & is, Line & line)
        {   
            return std::getline(is, line);
        }
    };
}

template<class OutIt>
void read_lines(std::istream& is, OutIt dest)
{
    typedef std::istream_iterator<detail::Line> InIt;
    std::copy(InIt(is), InIt(), dest);
}

int main()
{
    std::vector<std::string> v;
    read_lines(std::cin, std::back_inserter(v));

    return 0;
}

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