为结构指针实现自定义比较器

int compare(const void* a, const void* b) {
    // 将结构体指针转换为对应的结构体类型
    const struct MyStruct* structA = (const struct MyStruct*)a;
    const struct MyStruct* structB = (const struct MyStruct*)b;

    // 根据自定义的比较规则进行比较
    if (structA->field < structB->field) {
        return -1;
    } else if (structA->field > structB->field) {
        return 1;
    } else {
        return 0;
    }
}

struct MyStruct {
    int field;
};

int main() {
    struct MyStruct arr[5] = { {3}, {1}, {4}, {2}, {5} };
    int size = sizeof(arr) / sizeof(arr[0]);

    qsort(arr, size, sizeof(struct MyStruct), compare);

    // 输出排序后的结果
    for (int i = 0; i < size; i++) {
        printf("%d ", arr[i].field);
    }

    return 0;
}