C++从模板类派生出类模板

#include<iostream> using namespace std; //从模板类派生出类模板 /*类模板A*/ template <class T1 ,class T2 > class A { protected: T1 v1; T2 v2; public: void print() { cout << "v1=" << v1 << endl; cout << "v2=" << v2 << endl; } void setA(T1 v1_,T2 v2_) { v1 = v1_; v2 = v2_; } }; template<class T> class B :public A<int, double>//A<int,double>是具体的模板类;类模板B从基类A<int,double>共有派生而来 { /*此前从A<int,double>基类继承过来所有成员*/ T v; public: void print() { cout << "v=" << v << endl; } void setB(T v_) { v = v_; } }; int main() { B<char> obj; /*此时编译器已经生成两个模板类:B<char>和它的基类A<int,double>*/ obj.setA(7, 7.77); obj.setB('N'); obj.A<int, double>::print(); obj.print(); return 0; }