不應該在建構函數中呼叫虛擬函數(Virtual function)

程式執行到一個衍生物件並開始建構時, 它的基底物件會先被建構起來並產生其VTABLE. 如果衍生類別有重新定義某個虛擬函數, 則衍生物件的建構函數會在該衍生物件的;VTABLE中更新被重新定義虛擬函數之位址. 這就是你不應該在建構函數中呼叫虛擬函數的原因: 衍生物件中被重定義的虛擬函數之位址可能還沒有被放入/更改到衍生物件之VTABLE中. 你可能執行到舊的虛擬函數.

完整原文

Modern C++ in embedded systems Part 1 : Myth and Reality

Modern C++ in embedded systems Part 1 : Myth and Reality
by Dominic Herity

References
A reference in C++ is physically identical to a pointer. Only the syntax is different. References are safer than pointers because they can’t be null, they can’t be uninitialized, and they can’t be changed to point to something else. The closest thing to a reference in C is a const pointer. Note that this is not a pointer to a const value, but a pointer that can’t be modified. Listing 3 shows a C++ code fragment with a reference. 

     // C++ reference example
     void accumulate(int& i, int j) {
         i += j;
     }

Listing 3: C++ reference

[NTFS, Win7] Symbolic link

mklink：Creates a symbolic link.
適用平台：Windows Server 2008, Windows Vista、Windows 7 等以上版本

Syntax：

mklink [[/d] | [/h] | [/j]]

Parameters:

Parameter	Description
/d	Creates a directory symbolic link. By default, mklink creates a file symbolic link.
/h	Creates a hard link instead of a symbolic link.
/j	Creates a Directory Junction.
	Specifies the name of the symbolic link that is being created.
	Specifies the path (relative or absolute) that the new symbolic link refers to.
/?	Displays help at the command prompt.

Examples：
mklink /d C:\Users\eric_c_huang\Desktop\AAA C:\Document\ABC
在桌面上建立名為 AAA 的 symbolic link ，連結至 C:\Document  的 ABC 目錄…

建立 symbolic link 需要管理者權限，否則會出現「you do not have sufficient privilege to perform this operation」的錯誤訊息

How to find variants of "%f" ?

In UltraEdit, how to find C-language printf format specifier %f variants ?

such as
sprintf(str,"FPS=%2.2f",fps);
printf("%f\n",fps);
... and so on.

Mofi@Vienna :

With UltraEdit regular expression engine run a Find with Match Case enabled with search string

^%[0-9.]++f

 

[XP] 關閉"最近的文件"(Recent)

1. 開始 > 執行 > GPEDIT.MSC
2. 使用者設定 > 系統管理範本 >「開始」功能表和工作列
3. 「不保留最近開啟文件的記錄」此選項的值改成「已啟用」> 確定
4. 重開機

WinHEX launch takes too long time.

Possible solutions (or):
1. Close anti-virus daemons.
2. Delete files created after this situation occurs in WinHEX folder.
3. Delete files inside C:\Documents and Settings\user\ associated to WinHEX.

天天都是紀念日

06.18 訂婚
06.25 結婚
10.16 MmM
10.18 進入職場