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(wèn)題描述：在編譯的時(shí)候出現(xiàn)__none_rtti_object異常

解決方法：
編譯器開(kāi)啟支持運(yùn)行時(shí)刻識(shí)別/GR,/GR（啟用運(yùn)行時(shí)類(lèi)型信息）
Vs2003 如何打開(kāi)C++的RTTI機(jī)制
說(shuō)明：此選項(xiàng) (/GR) 添加代碼以便在運(yùn)行時(shí)檢查對(duì)象類(lèi)型。當(dāng)指定此選項(xiàng)時(shí)，編譯器定義 _CPPRTTI 預(yù)處理器宏。默認(rèn)情況下，此選項(xiàng)被清除 (/GR–)。
在 Visual Studio 開(kāi)發(fā)環(huán)境中設(shè)置此編譯器選項(xiàng)
   1. 打開(kāi)此項(xiàng)目的“屬性頁(yè)”對(duì)話框。
   2. 單擊“C/C++”文件夾。
   3. 單擊“語(yǔ)言”屬性頁(yè)。
   4. 修改“啟用運(yùn)行時(shí)類(lèi)型信息”屬性。

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