C++ 标准库中是否有等效于 std::endl 的选项卡？
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Is there a tab equivalent of std::endl within the standard library?
提问by matthewrdev
Using C++, is there an equivalent standard library constant for '\t'like there is for a newline?
使用 C++，是否有一个等效的标准库常量，'\t'就像换行符一样？
Ideally:
理想情况下：
std::stringstream ss;
ss << std::tab << "text";
If not, why is this the case?
如果不是，为什么会这样？
(I'm aware I can just insert a '\t'but I'd like to sate my curiosity).
（我知道我可以插入一个，'\t'但我想满足我的好奇心）。
回答by Brian
No. std::endlisn't a newline constant. It's a manipulatorwhich, in additionto inserting a newline, also flushesthe stream.
号std::endl是不是换行不变。它是一个操纵器，除了插入换行符外，还刷新流。
If you justwant to add a newline, you're supposed to just insert a '\n'. And if you just want to add a tab, you just insert a '\t'. There's no std::tabor anything because inserting a tab plus flushing the stream is not exactly a common operation.
如果你只想添加一个换行符，你应该只插入一个'\n'. 如果您只想添加一个选项卡，只需插入一个'\t'. 没有std::tab或任何东西，因为插入选项卡并刷新流并不是一个常见的操作。
回答by Trevor Hickey
If you want to add the feature yourself, it would look like this:
如果你想自己添加功能，它看起来像这样：
#include <iostream>
namespace std {
template <typename _CharT, typename _Traits>
inline basic_ostream<_CharT, _Traits> &
tab(basic_ostream<_CharT, _Traits> &__os) {
return __os.put(__os.widen('\t'));
}
}
int main() {
std::cout << "hello" << std::endl;
std::cout << std::tab << "world" << std::endl;
}
I don't recommend doing this, but I wanted to add a solution for completeness.
我不建议这样做，但我想添加一个完整的解决方案。
回答by Pranit Kothari
Actually, it is not needed.
实际上，它是不需要的。
Because endlfirst does the same job of inserting a newline as \n, and then also flushes the buffer.
因为endl首先执行与 插入换行符的相同工作\n，然后还刷新缓冲区。
Inserting \ton a stream does not require to flush it after .
\t在流上插入不需要在 .
回答by Sly_TheKing
No.
不。
There are only std::ends(insert null character) and std::flush(flush the stream) output manipulators besides std::endlin ostream include file.
除了ostream 包含文件之外，只有std::ends（插入空字符）和std::flush（刷新流）输出操纵器std::endl。
You can find others in ios and iomanip include files. Full list is here
您可以在 ios 和 iomanip 包含文件中找到其他人。完整列表在这里
