为什么没有ANSI C有命名空间？ [英] Why doesn't ANSI C have namespaces?

问题描述

有命名空间似乎像没有脑子的大多数语言。但据我所知，ANSI C不支持它。为什么不？任何计划，包括在未来的标准？

Having namespaces seems like no-brainer for most languages. But as far as I can tell, ANSI C doesn't support it. Why not? Any plans to include it in a future standard?

推荐答案

ç确实有命名空间。一为结构标记，一个用于其他类型。考虑下面的定义：

C does have namespaces. One for structure tags, and one for other types. Consider the following definition:

struct foo
{
    int a;
};

typedef struct bar
{
    int a;
} foo;

第一种具有的标签的美孚，后者是由与一个typedef Foo类型。仍然没有名称争食发生。这是因为结构变量和类型（内置类型和Typedef的类型），住在不同的命名空间。

The first one has tag foo, and the later is made into type foo with a typedef. Still no name-clashing happens. This is because structure tags and types (built-in types and typedef'ed types) live in separate namespaces.

什么C不允许是创建的新的的意志命名空间。下标准化之前这是在语言视为重要的，并且加入的命名空间也将威胁向后兼容，因为它需要名称重整工作的权利。我想这可以归结由于技术问题，不是哲学。

What C doesn't allow is to create new namespace by will. C was standardized before this was deemed important in a language, and adding namespaces would also threaten backwards-compatibility, because it requires name mangling to work right. I think this can be attributed due to technicalities, not philosophy.

编辑：
JeremyP幸好纠正我，并提到我错过了命名空间。有用于标签和结构/联合成员以及命名空间。

JeremyP fortunately corrected me and mentioned the namespaces I missed. There are namespaces for labels and for struct/union members as well.

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