标签:c style class blog code java
(1)ATL如何使用模板类
1 #include <iostream> 2 using namespace std; 3 4 class CBase 5 { 6 public: 7 CBase(){} 8 ~CBase(){} 9 10 void BaseMethod() 11 { 12 cout << "BaseMethod in Base" << endl; 13 } 14 }; 15 16 class CDerived : public CBase 17 { 18 public: 19 CDerived() {} 20 ~CDerived() {} 21 }; 22 23 template<class T> 24 class CComObject : public T 25 { 26 public: 27 CComObject() {} 28 ~CComObject() {} 29 30 void CallBaseMethod() 31 { 32 T * pT = static_cast<T*>(this); 33 pT->BaseMethod(); 34 } 35 }; 36 37 int main() 38 { 39 CComObject<CDerived> * pDerived = new CComObject<CDerived>; 40 pDerived->CallBaseMethod(); 41 delete pDerived; 42 }
为了更加快速和高效,ATL尽量避免使用虚函数,因为在大的类层次中,调用虚函数的代价比较高(运行速度和代码增长)
标签:c style class blog code java
原文地址:http://www.cnblogs.com/aoun/p/3760051.html