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                # 外部模板聲明 模板特化可以被顯式聲明,這可以作為消除多重實例化的一種方式。例如: ``` #include "MyVector.h" extern template class MyVector<int>; // 消除下面的隱式實例化 // MyVector 類將在“其他地方”被程序員顯式實例化 void foo(MyVector<int>& v) { //在這個地方使用vector類型 } ``` 下列代碼就是上例中的”其他地方”: ``` #include "MyVector.h" // 使MyVector類對客戶端(clients)可用(例如,共享庫) template class MyVector<int>; ``` 這種方法的主要目的是為避免編譯器和鏈接器的大量“去除冗余的實例化”工作。 參見: * Standard 14.7.2 Explicit instantiation * [N1448==03-0031] Mat Marcus and Gabriel Dos Reis: [Controlling Implicit Template Instantiation](http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2003/n1448.pdf) . (翻譯:lianggang jiang)
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