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vc2008中,mfc將大幅度地更新。我猜測更新mfc的原因,很可能mfc中的一些代碼阻礙了vc的進一步發展,不得不加以更新。
我以前曾經提起過,mfc有一個嚴重違背c++標準的地方:
class   H;
class   S
{
public:
        x()   {
                H*   pThis=this-offsetof(m_s,   H);
                ...
        }
};
class   H
{
        S   m_s;
};
H里包含S的對象,在S里,為了獲得宿主類H的指針,用自身的this指針減去m_s在H中的偏移量。這就要求一個類中的子對象必須同宿主對象放在一起 (連續分布),并且固定(偏移量永遠不變)。為了在對象布局上給予編譯器充分的自由,標準規定offsetof只能用于pod。mfc僅考慮在   vc上使用,所以為了方便而僅僅面向vc編譯器編碼。這帶來了移植性的問題。不過,編譯器間的移植性還是小事?,F在我們就可以看到mfc的這種做法是搬起 石頭砸自己的腳。
sutter和lippman都不止一次地提到將來vc要能夠不區分托管和本地的內存管理。也就是說托管的類型可以在native堆上分配,而   native的類型可以在托管堆上分配。問題來了,由于托管堆上,子對象和宿主對象的存放不是連續的,子對象可能同宿主對象隔著十萬八千里,和成千上萬的 對象。而且子對象可能會在宿主對象的前面。offset也是不確定的。在這種情況下,使用上面的這種代碼無異于自殺。所以,為了實現托管和本地內存管理的 統一,必須放棄offsetof這類畸形代碼。由此導致了mfc的大幅更新。
另一方面,vc越來越符合標準,而mfc中一些遺留的其他不符合標準的地方,使得編譯器不得不同時應付兩種情況:標準的和非標的。對編譯器著實是個負擔,消除這些非標的東西,反而能夠使得編譯器更加簡單高效。
以上這些都是猜測,實際如何,還需具體看2008的mfc庫代碼。不管怎么樣,如果你想要使自己的代碼依賴于非標準的特性的話,請三思而后行。
posted on 2007-11-15 15:14 longshanks 閱讀(2640) 評論(118)  編輯 收藏 引用
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青青草原综合久久大伊人导航_色综合久久天天综合_日日噜噜夜夜狠狠久久丁香五月_热久久这里只有精品
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