如何在 .h 中转发 typedef 结构 [英] How to forward typedef'd struct in .h

问题描述

我有预处理器.h

#define MAX_FILES 15

struct Preprocessor {
    FILE fileVector[MAX_FILES];
    int currentFile;
};

typedef struct Preprocessor Prepro;

void Prepro_init(Prepro* p) {
    (*p).currentFile = 0;
}

那时我意识到我必须将声明与定义分开.所以我创建了 Preprocessor.c:

I realized then that I had to separate declarations from definitions. So I created Preprocessor.c:

#define MAX_FILES 15

struct Preprocessor {
    FILE fileVector[MAX_FILES];
    int currentFile;
};

typedef struct Preprocessor Prepro;

Preprocessor.h 现在是:

And Preprocessor.h is now:

void Prepro_init(Prepro* p) {
    (*p).currentFile = 0;
}

这显然行不通，因为 Pr..h 不知道 Prepro 类型.我已经尝试了几种组合，但都没有奏效.我找不到解决方案.

That obviously, doesn't work because Pr..h doesn't know Prepro type. I already tried several combinations, none of them worked. I can't find the solution.

推荐答案

将 typedef struct Preprocessor Prepro; 移动到文件头和 c 文件中的定义以及 Prepro_init 定义.这将毫无问题地为您转发声明.

Move the typedef struct Preprocessor Prepro; to the header the file and the definition in the c file along with the Prepro_init definition. This is will forward declare it for you with no issues.

预处理器.h

#ifndef _PREPROCESSOR_H_
#define _PREPROCESSOR_H_

#define MAX_FILES 15

typedef struct Preprocessor Prepro;

void Prepro_init(Prepro* p);

#endif

预处理器.c

#include "Preprocessor.h"

#include <stdio.h>

struct Preprocessor {
    FILE fileVector[MAX_FILES];
    int currentFile;
};

void Prepro_init(Prepro* p) {
    (*p).currentFile = 0;
}

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