什么是C ++ iostream endl fiasco？ [英] What is the C++ iostream endl fiasco?

问题描述

我在听一个 Google Talk的演讲时，Andrei Alexandrescu对D程式语言进行了讲解，内衬关于endl的失败。我只是认为endl是首选的方式来表示一行的结束和刷新缓冲区的流。为什么被认为是一个失败？

解决方案

重新发布我的评论：

（我假设）他只是意味着许多，特别是新的C ++程序员使用 std :: endl 盲目而不是'\

也就是说，大多数人都被告知 std :: endl 是 在标准方式下将换行符插入流中，即使很少需要或适合冲洗

这是一些人的意见（*咳*）， std :: endl 在标准中，因为它非常适合且不是有效的输入'\\\
'< （ s）：

• 最后， std :: endl 除了通常更糟的性能和通常更多之前没有任何东西。


• 它有它的用途，因此...


• 它的效用非常可疑，它的普遍性是荒谬的 - 确实是一个失败！

I was listening to a google talk by Andrei Alexandrescu on the D programming language when he threw out a one liner about the "endl" fiasco. I just thought endl was the preferred way to signify the end of a line and flush the buffer for a stream. Why is it considered a fiasco? Should I not be using it in my code?

解决方案

Reposting from my comment:

(I assume) He just means that many, especially new, C++ programmers use std::endl blindly instead of '\n' for newline, flushing unnecessarily frequently and potentially making the performance of their program abysmal.

I.e., most people are taught that std::endl is the canonical way to insert a newline into a stream even though it is very rarely necessary or appropriate to flush it.

It is some people's opinion (*cough*) that std::endl shouldn't even be in the standard, as it is so rarely appropriate and not a significant typing savings over '\n' << std::flush anyway.

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TL;DR(s):

• In the end, std::endl buys you nothing except usually worse performance and usually more typing.
• It has its uses, but they are considerably rarer than its frequency of use in most large codebases would suggest, therefore...
• Its utility is highly questionable and its ubiquity is absurd – a fiasco indeed!

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