Question

在下面的问题上挣扎太久了，需要一些帮助！

尝试从不同的标题访问结构的成员，但内存对我做错的事情有点模糊！我似乎记得我需要用typedef做一些奇怪的事情吗？

parseinput.h

#ifndef PARSEINPUT_H
#define PARSEINPUT_H

extern struct pitching_stat_struct pitching_home_player;

#endif

parseinput.cpp

struct pitching_stat_struct
{
    char playerID[16] = { '\0' };
    char teamID[16] = { '\0' };
    unsigned short W = 0;
    unsigned short L = 0;
    unsigned short G = 0;
} pitching_home_player;

someother.cpp

#include "parseinput.h"

void getStructElement()
{
    unsigned short playersW = pitching_home_player.W;
    // Results in below errors:
    // error C2027: use of undefined type 'pitching_stat_struct
    // error C2228: left of '.W' must have class/struct/union
}

感谢帮助。

Answer 1

翻译单元不足以拥有您想要使用的类型的对象。它还需要知道它是如何定义的。仅包括parseinput.h并没有给出它的定义。为了做到这一点，你需要

<强> parseinput.h

#ifndef PARSEINPUT_H
#define PARSEINPUT_H

struct pitching_stat_struct
{
    char playerID[16] = { '\0' };
    char teamID[16] = { '\0' };
    unsigned short W = 0;
    unsigned short L = 0;
    unsigned short G = 0;
}

extern pitching_stat_struct pitching_home_player;

#endif

<强> parseinput.cpp

#include "parseinput.h"

pitching_stat_struct pitching_home_player;

<强> someother.cpp

#include "parseinput.h"

void getStructElement()
{
    unsigned short playersW = pitching_home_player.W;
    //...
}

从不同的头访问extern struct成员

1 个答案: