c++ - 有关C++中char数据类型的问题

Question

我了解'char'数据类型用于存储单个字符并使用1个字节的事实，但是char16_t，char32_t和wchar_t分别用于什么呢？毕竟，我们只需要存储一个字符

Answer 1

关于char16_t和char32_t，引用Microsoft article:

The char16_t and char32_t types represent 16-bit and 32-bit wide characters, respectively. Unicode encoded as UTF-16 can be stored in the char16_t type, and Unicode encoded as UTF-32 can be stored in the char32_t type. Strings of these types and wchar_t are all referred to as wide strings, though the term often refers specifically to strings of wchar_t type.

对于 wchar_t:

The wchar_t type is an implementation-defined wide character type. In the Microsoft compiler, it represents a 16-bit wide character used to store Unicode encoded as UTF-16LE, the native character type on Windows operating systems. The wide character versions of the Universal C Runtime (UCRT) library functions use wchar_t and its pointer and array types as parameters and return values, as do the wide character versions of the native Windows API.

因此，不能仅仅将它们说成一个角色。如上所述，类型与编码不同。

例如，以 u编码的字符 char16_t(U + 0075)被存储为 feff0075。