更改cin（c ++）的分隔符 [英] changing the delimiter for cin (c++)

问题描述

我已重定向cin从文件流读取 cin.rdbug（inF.rdbug（））
当我使用提取操作符

I've redirected "cin" to read from a file stream cin.rdbug(inF.rdbug()) When I use the extraction operator it reads until it reaches a white space character.

是否可以使用另一个分隔符？

Is it possible to use another delimiter? I went through the api in cplusplus.com, but didn't find anything.

推荐答案

可以改变inter- cin 的字分隔符或任何其他 std :: istream ，使用 std :: ios_base :: imbue 添加自定义< a href =http://en.cppreference.com/w/cpp/locale/ctype> ctype facet 。

It is possible to change the inter-word delimiter for cin or any other std::istream, using std::ios_base::imbue to add a custom ctype facet.

如果您正在以/ etc / passwd风格读取文件，以下程序将分别读取每个：限定词。

If you are reading a file in the style of /etc/passwd, the following program will read each :-delimited word separately.

#include <locale>
#include <iostream>


struct colon_is_space : std::ctype<char> {
  colon_is_space() : std::ctype<char>(get_table()) {}
  static mask const* get_table()
  {
    static mask rc[table_size];
    rc[':'] = std::ctype_base::space;
    rc['\n'] = std::ctype_base::space;
    return &rc[0];
  }
};

int main() {
  using std::string;
  using std::cin;
  using std::locale;

  cin.imbue(locale(cin.getloc(), new colon_is_space));

  string word;
  while(cin >> word) {
    std::cout << word << "\n";
  }
}

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