多目标遗传算法 ------ NSGA-II （部分源码解析）辅助变量 双链表操作 list.c

/* A custom doubly linked list implemenation */

# include <stdio.h>
# include <stdlib.h>
# include <math.h>

# include "global.h"
# include "rand.h"

/* Insert an element X into the list at location specified by NODE */
void insert (list *node, int x)
{
    list *temp;
    if (node==NULL)
    {
        printf("
 Error!! asked to enter after a NULL pointer, hence exiting 
");
        exit(1);
    }
    temp = (list *)malloc(sizeof(list));
    temp->index = x;
    temp->child = node->child;
    temp->parent = node;
    if (node->child != NULL)
    {
        node->child->parent = temp;
    }
    node->child = temp;
    return;
}

/* Delete the node NODE from the list */
list* del (list *node)
{
    list *temp;
    if (node==NULL)
    {
        printf("
 Error!! asked to delete a NULL pointer, hence exiting 
");
        exit(1);
    }
    temp = node->parent;
    temp->child = node->child;
    if (temp->child!=NULL)
    {
        temp->child->parent = temp;
    }
    free (node);
    return (temp);
}

typedef struct lists
{
    int index;
    struct lists *parent;
    struct lists *child;
} list;

list  结构体中有两个指针，可构成双向链表，数值空间存放   索引序号  。

insert  函数

申请一块新的内存空间，放在在 list  指针   指向的空间之后。

del  函数

将  list  指向 的个体空间释放。

以上两个操作在插入，删除操作后都有修改指针操作，保证原有链表 的  上下链接正常。