什么是C正向参考？ [英] What is forward reference in C?

问题描述

什么是相对于指针在C正向参考？

What is forward reference in C with respect to pointers?

我能得到一个例子吗？

推荐答案

请参阅本页面<一个href=\"https://web.archive.org/web/20080314031412/http://h30097.www3.hp.com/docs/base_doc/DOCUMENTATION/V40F_HTML/AQTLTBTE/DOCU_024.HTM\"相对=nofollow>向前引用的。我不知道如何引用推进会有所不同的指针，并与其他POD类型。

See this page on forward references. I don't see how forward referencing would be different with pointers and with other PoD types.

请注意，您可以转发声明的类型，并声明这是指向该类型变量：

Note that you can forward declare types, and declare variables which are pointers to that type:

struct MyStruct;
struct MyStruct *ptr;
struct MyStruct var;  // ILLEGAL
ptr->member;  // ILLEGAL

struct MyStruct {
    // ...
};

// Or:

typedef struct MyStruct MyStruct;
MyStruct *ptr;
MyStruct var;  // ILLEGAL
ptr->member;  // ILLEGAL

struct MyStruct {
    // ...
};

我觉得这是你问的指针和前瞻性声明打交道时。

I think this is what you're asking for when dealing with pointers and forward declaration.

这篇关于什么是C正向参考？的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！