作者查詢 / shadow0326
作者 shadow0326 在 PTT [ C_and_CPP ] 看板的留言(推文), 共825則
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收起看板(593)
15F→:以前修組語 期末porject無聊到用組語刻GUI 做出一個11/12 11:52
16F→:勉強會動的垃圾出來 被助教下評語說現在你們應該學到11/12 11:52
17F→:組語不適合直接做GUI...11/12 11:52
1F推:多載的是StringOperator, 不是ptr to StringOperator11/11 13:40
2F→:str1=str2 就只是讓兩個pointer指到同一位址而已11/11 13:42
3F→:突然想到CLI的handle和一般的ptr不太一樣, 所以上面講11/11 13:51
4F→:的不太對...不過大體上問題的方向應該是相同的11/11 13:52
1F→:所以那個template function只能餵CItemInfoBase或它的11/10 18:01
2F→:衍生類別 亂餵會error沒錯11/10 18:02
4F推:編譯時 compiler會根據使用到此template的地方代入指定11/10 18:30
5F→:的typename 如果compiler發現你餵了錯誤的typename給這11/10 18:31
6F→:個template function 就會compile error11/10 18:32
7F→:而他當然可以指到SetItemCode() 只要compiler看到你餵11/10 18:32
8F→:的typename有SetItemCode()就好11/10 18:33
9F→:甚至, 如果根本沒有其它code用到此template, 那你還可11/10 18:33
10F→:以指到任何UnknownFunction() (印象中是可以啦...)11/10 18:34
19F推:其實可以只提供copy assign operator11/11 12:00
20F→:而不提供copy constructor啦11/11 12:00
21F→:個人覺得這比較算是一種風格或優良習慣的問題11/11 12:01
31F推:如果有自信絕對不會被call到copy ctor的話就可以不做(?11/11 15:04
32F→:不過事實上copy ctor會在很多隱性的地方被呼叫 如STL11/11 15:04
1F推:for (i==0 <---?11/10 16:17
1F→:A是一個pointer, *A是此pointer指到的位址中的值11/10 11:13
2F→:所以A是int*, *A是int 19行寫法是錯的, 無觀malloc11/10 11:14
3F→: 關11/10 11:17
4F→:不過像這樣把內存小的cast到大的 可能會讀到一些外部的11/10 11:18
5F→:位址11/10 11:19
7F推:未必哦 假設short是2bytes, int是4bytes 然後不malloc11/10 11:27
8F→:而直接寫成A = (int *)&c; 那printf那行就會讀到一些11/10 11:28
10F→:未定義的記憶體位址 (4-2=2bytes)11/10 11:28
38F→:我覺得對話有點分歧 XDD11/10 12:03
4F推:http://www.difranco.net/cop2220/op-prec.htm 見note211/09 22:33
2F推:我上班時剛好開機了 XD11/09 21:23
8F→:因為m_str是一個char*,sizeof(m_str)等於sizeof(char*)11/08 17:09
9F→:在你的機器上面char*就是4個bytes 所以才印411/08 17:10
18F推:pstr是char*[] 不是char** 陣列可以用sizeof算整個大小11/08 17:48
19F→:比如你的m_str如果宣告成 char m_str[] = "abcdef";11/08 17:49
20F→:那sizeof(m_str)就會是7 (含'\0')11/08 17:50
21F→:另外如果陣列丟給函式當參數傳遞的話 sizeof也就不會是11/08 17:51
22F→:整個陣列的大小了11/08 17:51
6F推:難度要試測資而定 什麼都沒教的話應該是不會惡搞啦11/04 22:31
9F→:就是用二進位表示浮點數不見得是精確的15.111/04 23:04
10F→:可能是15.099999 或15.100001 之類的11/04 23:04
1F推:目前為止實務上自己有用到 唯一覺得這樣有意義的地方是11/04 11:23
2F→:其他要使用此物件的人只要include 抽象的介面部分就好11/04 11:23
3F→:比如實體部份內可能又有include 物件A,B,C,D 如果不把11/04 11:24
4F→:介面拉出來 就變成每個用到它的都要include A,B,C,D...11/04 11:24