C/C++ 中整数类型别名的标准保证?例如:是“无符号"吗?总是等于“unsigned int"? [英] Standard guarantees for aliases of integer types in C/C++? E.g.: Is "unsigned" always equal to "unsigned int"?

问题描述

第一个问题:

• unsigned"总是与unsigned int"一样吗?
• signed"总是和int"一样吗?
• short"总是与signed short"一样吗?
• 是……

第二个问题:

如果 C/C++ 标准规定了上述问题的答案，哪些段落与它们相关?

If a C/C++ standard specifies answers to above questions, what paragraphs are related to them?

推荐答案

是的，这些都是有保证的.在 C++11 中，请参阅 §7.1.6.2[dcl.type.simple]/table 10，其中列出了所有简单类型说明符(及其组合)及其含义.例如，该表包括以下内容:

Yes, these are guaranteed. In C++11, see §7.1.6.2[dcl.type.simple]/table 10, which lists all of the simple type specifiers (and combinations thereof) and what they mean. For example, the table includes the following:

unsigned      => unsigned int
unsigned int  => unsigned int

signed        => int
signed int    => int
int           => int

C11 在 §6.7.2/2 中有一个类似的映射(它的格式不同，但它指定了相同的等效组合组，至少对于 C 和 C++ 共有的所有类型).

C11 has a similar mapping in §6.7.2/2 (it's formatted differently, but otherwise it specifies the same groups of equivalent combinations, at least for all of the types common to C and C++).

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