std :: endl和'\ n'有什么区别 [英] What's the difference between std::endl and '\n'

问题描述

我已经读到了std::endl和'\n'之间的区别是std::endl刷新了缓冲区，而'\n'没有.但是，据我所知，Linux上的stdout仍然是行缓冲的，这是否意味着std::cout << ... << std::endl与std::cout << ... << '\n'相同?

I've read the difference between std::endl and '\n' is that std::endl flushes the buffer and '\n' doesn't. However, as far as I know stdout on linux is line-buffered anyway, so does it mean that std::cout << ... << std::endl is the same as std::cout << ... << '\n'?

推荐答案

std::ostream os;

os << std::endl; // more concise

os << '\n' << std::flush; // more explicit about flushing

这两行效果完全相同.

手动冲洗通常是浪费时间:

The manual flushing is often a waste of time:

• 如果输出流是行缓冲的，则std::cout应该是这种情况，如果它连接到交互式终端，并且实现可以检测到该结果，然后打印\n已经刷新.

• If the output stream is line-buffered, which should be the case for std::cout if it connects to an interactive terminal and the implementation can detect that, then printing \n already flushes.

如果输出流与您随后直接从中读取的输入流配对(std::cout和std::cin已配对)，则读取已刷新.

If the output stream is paired with an input stream you read from directly afterwards (std::cout and std::cin are paired), then reading already flushes.

如果您没有人等待数据到达其目的地，则刷新将再次浪费.

If you nobody waits for the data to arrive at its destination, flushing is again just going to waste.

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