作者查詢 / dendrobium
作者 dendrobium 在 PTT [ C_and_CPP ] 看板的留言(推文), 共583則
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9F推:通常都不推plus02/04 21:34
13F推:得到一個 Warning02/04 18:14
1F推:就說了是virtual address了，當然是虛擬出來的位置02/01 22:07
2F→:如果virtual address一樣 physical address就要一樣02/01 22:08
3F→:那你說說 virtual address的意義何在...02/01 22:08
2F→:你這樣寫 原PO肯定看不懂你在寫啥...XD02/01 19:54
1F→:有些點看起來都跑出來了, 應該先確定在裡面的定義是啥02/01 19:53
1F→:s/查/差 :p01/29 23:42
1F推:2. FOO() 被轉成 FOO(AA* this) 了吧 所以還是可以call01/29 22:51
2F推:ptr-=4; // ptr是指標捏...01/29 23:01
5F推:3.cout << (int) *(int*)&(pb->y) ; 滿亂來的...01/29 23:10
7F推:1. 因為pb,p,ptr 這三個的位置是一樣的...01/29 23:16
9F→: (int)*ptr 的意思就是叫電腦把 *ptr 當 int 看01/29 23:17
10F→:所以不管他是big還是little都一樣...01/29 23:18
15F推:你是想問 為什麼不能用 (int) pb->y 嗎?01/29 23:38
18F推:(int) pb->y 只是把 pb->y 的值(double) 轉成int01/29 23:42
19F→:而不是把那塊記憶體當成 int 來讀01/29 23:43
22F→:哈哈 最左邊的(int) 可以不用寫XD01/29 23:46
25F推:我畫的圖 左邊是小 右邊是大 :)01/29 23:49
27F→:以指標所指的位置為準 指哪就丟哪囉01/29 23:50
31F推:物件或是陣列之類的放在stack或heap併不會換順序呀01/30 00:03
32F→:會換的話...那 *(ptr+5) 在兩邊的意思不就不同了XD01/30 00:04
40F推:你可以把 void AA::FOO() 想成是 void FOO(AA* this)01/30 00:23
41F→:而 p->FOO() 被轉成 FOO(p)01/30 00:24
46F推: *(int*)&(pb->y) /* 抓前四個byte當 int */01/30 00:30
49F→:Yeah!01/30 00:31
51F→:應該說是被round掉了吧 忘記是四捨五入還是 floor了...01/30 00:32
52F推:好像是以前上課聽到的...?01/30 00:35
53F→:忘記好像是compiler是這樣將C++轉成C 然後當成C處理01/30 00:36
54F→:不過遇到 virtual function 會比較複雜01/30 00:40
2F→:版規201/25 13:06
12F→:很顯然的，原PO應該先回前面的章節再看一次...01/23 21:41
1F→:我很想問為什麼編不過不去看錯誤訊息? 也不PO上來01/23 12:56