c++ - istream_iterator 复制示例一直等待输入

Question

我尝试实现“C++ 标准库”第 107 页中的流迭代器示例。我被困在这条线上:

copy (istream_iterator<string>(cin), istream_iterator<string>(), back_inserter(coll)); 

程序在这里继续从控制台读取数据，但不会传递到下一行。我该如何继续过去这一点？

Answer 1

From cppreference:

The default-constructed std::istream_iterator is known as the end-of-stream iterator. When a valid std::istream_iterator reaches the end of the underlying stream, it becomes equal to the end-of-stream iterator. Dereferencing or incrementing it further invokes undefined behavior

^加粗

换句话说，std::istream_iterator<string>(std::cin)一直持续到 std::cin 的输入结束.这不会发生在行尾，而是发生在文件结尾。在控制台中，有specific commands to trigger the EOF。 :

In UNIX systems it is Ctrl+D, in Windows Ctrl+Z.