| 一个带有解除函数的链表
typedef void (*ListNodeDestructor)( void * );
typedef struct liststruct
{
ListNodeDestructor DestructFunc;
liststruct *next;
} LIST, *pLIST;
pLIST AddToList( pLIST Head, void * data, size_t datasize,
ListNodeDestructor Destructor )
{
pLIST newlist=NULL;
void *p;
// 分配节点内存和数据内存
newlist = (pLIST) malloc( datasize + sizeof( LIST ) );
// 为这块数据缓冲区指定一个指针
p = (void *)( newlist + 1 );
// 复制数据
memcpy( p, data, datasize );
newlist->DestructFunc = Destructor;
// 将这个节点指定给链表的表头
if( Head )
{
newlist->next = Head;
}
else
newlist->next = NULL;
Head = newlist;
return Head;
}
void DeleteList( pLIST Head )
{
pLIST Next;
while( Head )
{
Next = Head->next;
Head->DestructFunc( (void *) Head );
free( Head );
Head = Next;
}
}
typedef struct ListDataStruct
{
LPSTR p;
} LIST_DATA, *pLIST_DATA;
void ListDataDestructor( void *p )
{
// 对节点指针进行类型转换
pLIST pl = (pLIST)p;
// 对数据指针进行类型转换
pLIST_DATA pLD = (pLIST_DATA) ( pl + 1 );
delete pLD->p;
}
pLIST Head = NULL;
void TestList()
{
pLIST_DATA d = new LIST_DATA;
d->p = new char[24];
strcpy( d->p, "Hello" );
Head = AddToList( Head, (void *) d, sizeof( pLIST_DATA ),
ListDataDestructor );
// 该对象已被复制，现在删除原来的对象
delete d;
d = new LIST_DATA;
d->p = new char[24];
strcpy( d->p, "World" );
Head = AddToList( Head, (void *) d, sizeof( pLIST_DATA ),
ListDataDestructor );
delete d;
// 释放链表
DeleteList( Head );
} | 