轉(zhuǎn)載：http://www.artima.com/cppsource/pure_virtual.html
When you construct an instance of a derived class, what happens, exactly? If the class has a vtbl, the process goes something like the following:

Step 1: Construct the top-level base part:.

1. Make the instance point to the base class's vtbl.
2. Construct the base class instance member variables.
3. Execute the body of the base class constructor.

 

Step 2: Construct the derived part(s) (recursively):

1. Make the instance point to the derived class's vtbl.
2. Construct the derived class instance member variables.
3. Execute the body of the derived class constructor.

 

Destruction happens in reverse order, something like this:

Step 1: Destruct the derived part:

1. (The instance already points to the derived class's vtbl.)
2. Execute the body of the derived class destructor.
3. Destruct the derived class instance member variables.

 

Step 2: Destruct the base part(s) (recursively):

1. Make the instance point to the base class's vtbl.
2. Execute the body of the base class destructor.
3. Destruct the base class instance member variables.

問題描述：在編譯的時候出現(xiàn)__none_rtti_object異常

解決方法：
編譯器開啟支持運行時刻識別/GR,/GR（啟用運行時類型信息）
Vs2003 如何打開C++的RTTI機(jī)制
說明：此選項 (/GR) 添加代碼以便在運行時檢查對象類型。當(dāng)指定此選項時，編譯器定義 _CPPRTTI 預(yù)處理器宏。默認(rèn)情況下，此選項被清除 (/GR–)。
在 Visual Studio 開發(fā)環(huán)境中設(shè)置此編譯器選項
   1. 打開此項目的“屬性頁”對話框。
   2. 單擊“C/C++”文件夾。
   3. 單擊“語言”屬性頁。
   4. 修改“啟用運行時類型信息”屬性。

       終于有了自己的技術(shù)博客了，以往寫代碼的時候總是有一些問題解決了就沒有記錄下來，后來重新碰到此類問題又得重頭開始解決，很是惱火。希望在以后的開發(fā)中能夠?qū)⑺鶎W(xué)、所感能夠記錄于此。
       同時希望能夠與大家同進(jìn)步