在C中初始化结构的静态数组 [英] Initialize Static Array of Structs in C

问题描述

我正在用C实现纸牌游戏.纸牌类型很多，每种都有很多信息，包括一些需要单独编写与之相关联的动作.

I'm implementing a card game in C. There are lots of types of cards and each has a bunch of information, including some actions that will need to be individually scripted associated with it.

给出这样的结构(我不确定我是否对函数指针具有正确的语法)

Given a struct like this (and I'm not certain I have the syntax right for the function pointer)

struct CARD {
    int value;
    int cost;
    // This is a pointer to a function that carries out actions unique
    // to this card
    int (*do_actions) (struct GAME_STATE *state, int choice1, int choice2);
};

我想初始化一个静态数组，每张卡一个.我猜这看起来像这样

I would like to initialize a static array of these, one for each card. I'm guessing this would look something like this

int do_card0(struct GAME_STATE *state, int choice1, int choice2)
{
    // Operate on state here
}

int do_card1(struct GAME_STATE *state, int choice1, int choice2)
{
    // Operate on state here
}

extern static struct cardDefinitions[] = {
    {0, 1, do_card0},
    {1, 3, do_card1}
};

1. 这项工作是否可行，我是否正以正确的方式进行处理?我正在努力避免大量的switch语句.

1. Will this work, and am I going about this the right way at all? I'm trying to avoid huge numbers of switch statements.

我是否需要提前定义'do_cardN'函数，或者在结构初始化中是否有某种内联定义它们的方法(类似于python中的lambda函数)?

Do I need to define the 'do_cardN' functions ahead of time, or is there some way to define them inline in the initialization of the struct (something like a lambda function in python)?

我需要对其他文件中的cardDefinitions进行只读访问-外部静态"是否正确?

I'll need read-only access to cardDefinitions from a different file - is 'extern static' correct for that?

我知道这是很多问题，但是我对于如何解决这个问题确实有点含糊.

I know this is a lot of questions rolled into one but I'm really a bit vague about how to go about this.

谢谢.

要清楚，我的目标是能够做类似的事情

To be clear, my goal is to be able to do something like

int cost = cardDefinitions[cardNumber].cost;

或

int result = cardDefinitions[cardNumber].do_action(state, choice1, choice2);

而不是到处使用巨大的switch语句.

Instead of using huge switch statements all over the place.

推荐答案

您的方法完全正确.

1. 这将起作用，并且是避免庞大的switch语句的好方法.
2. 您不能在C语言中内联定义函数，每个函数必须具有唯一的名称.

3. extern是您想要的，而不是static.更改您的身体为:

1. This will work, and is a good way to avoid huge switch statements.
2. You can't define functions inline in C, they each must have a unique name.

3. extern is what you want, not static. Change your body to be this:

struct CARD cardDefinitions[] = { 
    {0, 1, do_card0}, 
    {1, 3, do_card1} 
}; 

然后在适当的头文件中:

then in an appropriate header file:

extern struct CARD cardDefinitions[];

这篇关于在C中初始化结构的静态数组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！