组或单选按钮之间的依赖关系,最佳实践?

read . 如果(0-无访问权限,1-有限[仅限好友],2-公共访问权限),则在更改GroupB验证GroupA中的值后,GroupA值可能如下所示 GroupA.value = (GroupA.value <= GroupB.value) ? GroupA.value : GroupB.value . GroupB-读取权限,GroupA-写入权限。

定义一个位掩码用于查看,另一个位掩码用于发布,每个位中有一个位用于公共和朋友(关闭意味着两个位都设置为0)。设置为1的位允许访问,设置为0的位拒绝访问。

AND

像C或C++这样的东西,看起来会像这样:

unsigned view;
unsigned post;

enum { friends = 1, public = 2 };

view = friends;
post = friends | public;    // create an invalid combination
post &= view;               // correct the invalid combination;

您还可以定义结构中的比较,并检查函数中的每个条目。

#define ACCESS_CLOSED 0
#define ACCESS_FRIEND 1
#define ACCESS_PUBLIC 2

typedef struct dep {
    int *master;
    int masterval;
    int *slave;
    int slaveval;
} dep_t;

int checkdeps(dep_t *deps, int n)
{
    int i;

    for (i=0; i<n; i++) {
        if (*(deps[i].master) == deps[i].masterval)
            *(deps[i].slave) = deps[i].slaveval;
    }
}

int main(void)
{
    int groupA = ACCESS_FRIEND;
    int groupB = ACCESS_FRIEND;
    int groupC = ACCESS_FRIEND;

    // if  the first argument has the value of the second argument
    // then the third is set to the value from the fourth
    dep_t deps[] = {
        { &groupB, ACCESS_CLOSED, &groupA, ACCESS_CLOSED },
        { &groupB, ACCESS_FRIEND, &groupC, ACCESS_CLOSED }
    };

    groupB = ACCESS_CLOSED;
    checkdeps(deps, sizeof(deps)/sizeof(dep_t));

    printf("A: %d, B: %d, C: %d\n", groupA, groupB, groupC);

    return 0;
}