sizeof(unsigned char)也保证为1吗？

Question

我认为标题是不言自明的,但更好的格式.

难道sizeof(unsigned char)还保证是1？

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我不相信这个问题是重复的,因为:

• C与C++(标签摘录:)不同...It was originally designed as an extension to C, and keeps a similar syntax, but is now a completely different language....
• char可以是签名或未签名.除非你得到标准的保证,否则没有理由假设sizeof(unsigned char)== sizeof(char)因此问题.
• 即使您将C与C++混淆,答案也不会重叠.

Answer 1

参考:http://en.cppreference.com/w/cpp/language/sizeof

sizeof(char),sizeof(signed char)和sizeof(unsigned char)始终返回1.

Answer 2

是.

[expr.sizeof]/1:

sizeof(char),sizeof(signed char)和sizeof(unsigned char)是1.

另外,[basic.fundamental]/1:

A char,a signed char和a unsigned char占用相同的存储量并具有相同的对齐要求