什么是数据类型锵编译器Ç枚举？ [英] What's the data-type of C enum of Clang compiler?

问题描述

我张贴的其他问题：<一href=\"http://stackoverflow.com/questions/3509470/what-type-should-i-use-for-binary-re$p$psentation-of-c-enum\">http://stackoverflow.com/questions/3509470/what-type-should-i-use-for-binary-re$p$psentation-of-c-enum,和答案，我要知道我的编译器的枚举数据类型。

I posted other question: http://stackoverflow.com/questions/3509470/what-type-should-i-use-for-binary-representation-of-c-enum, and by the answer, I have to know my compiler's enum data-type.

什么是上锵编译数据C型枚举的？

What's the data-type of C enum on Clang compiler?

推荐答案

最喜欢的（全部，也许）C编译器，一个枚举类型的大小可以变化。下面是一个例子程序和它的输出：

Like most (all, maybe) C compilers, the size of an enumerated type can vary. Here's an example program and its output:

#include <stdio.h>

typedef enum
{
  val1 = 0x12
} type1;

typedef enum
{
  val2 = 0x123456789
} type2;

int main(int argc, char **argv)
{
  printf("1: %zu\n2: %zu\n", sizeof(type1), sizeof(type2));
  return 0;
}

输出：

1: 4
2: 8

所有的标准要求是：

All that the standard requires is:

类型的选择是实现定义的，但应能重新presenting枚举的所有成员的值。

The choice of type is implementation-defined, but shall be capable of representing the values of all the members of the enumeration.

一个快速网络搜索不转了所指定的行为铿锵手册，但一个是几乎可以肯定在某个地方。

A quick web search didn't turn up a clang manual that specified its behaviour, but one is almost certainly out there somewhere.

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