输出UTF-8(u8)std :: string [英] Output UTF-8 (u8) std::string

问题描述

在C ++ 11和更高版本中，在字符串文字上使用u8前缀可以创建UTF-8编码的char(字节)序列.

In C++11 and later, using the u8 prefix on a string literal can create char (byte) sequences that are UTF-8 encoded.

如何将这些序列输出到std::ostream?您如何告诉std::ostream要输出的const char *或std:string包含以UTF-8编码的字符，而不是默认编码?

How do you output those sequences to a std::ostream? How do you tell a std::ostream that a const char * or std:string to be output contains characters encoded in UTF-8, rather than the default encoding?

推荐答案

您没有.流不知道或不在乎文本的编码是什么.尽管它有名称，但std:ostream不会将char视为包含以平台编码方式编码的字符.它必须将char视为要写入的字节.假定您不使用改变其内容的方面，它会按照给定的内容(可能执行\n转换的方式)写入文本"(字节序列).如果您编写符合UTF-8的字符，那么输出的结果就是这样.

You don't. The stream does not know or care what the encoding of the text is. Despite it's name, a char is not treated by std:ostream as containing a character encoded in the platform encoding. It must treats a char as a byte to be written out. It writes the "text" (byte sequence) as given (outside of possibly performing \n translation), assuming you don't imbue it with a facet that changes this. If you write characters that conform to UTF-8, then that's what ends up in the output.

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