C++中，可以定义类模板。
#include <iostream> using namespace std; template <class T> class Vector { public: Vector(int); ~Vector(); Vector(const Vector&); Vector& operator=(const Vector& rhs); T& operator[](int); void print() { cout << "print()" << endl; } private: T* m_elements; int m_size; }; template <class T> Vector<T>::Vector(int size) :m_size(size) { cout << "this is constructor" << endl; cout << this->m_size << endl; m_elements = new T[m_size]; } template <class T> Vector<T>::~Vector() { cout << "this is Destrucor" << endl; delete[] m_elements; m_elements = NULL; } template<class T> Vector<T>::Vector(const Vector &) { cout << "this is copy construcor" << endl; } template <class T> Vector<T>& Vector<T>::operator=(const Vector& rhs) { cout << "this is = " << endl; //*this = rhs; return *this; } template <class T> T& Vector<T>::operator[](int index) { if (index>=0 && index<m_size) { return m_elements[index]; } else { cout << "index is invalid" << endl; } } int main() { Vector<int> v1(6); Vector<double> v2(2); v2[0] = 11.1; cout << "v1[0]: "<<v1[0] << endl; cout <<"v2[0]:"<< v2[0] <<" v2[1]: "<<v2[1]<< endl; cout << "hello" << endl; int i = 1; for (; i < 6; i++) { v1[i] = i; } cout << typeid(v2[1]).name() << endl; cout << i << endl; return 0; }