类模板应用.cpp

实现了一个类模板的简单应用

#include<iostream>
#include<cstdlib>
using namespace std;

struct Student
{
	int id;
	float gpa;
};
template <class T>
class Store{
private:
	T item;
	int haveValue;
public:
	Store(void);
	T GetElem(void);
	void PutElem(T x);
};


template <class T>
Store<T>::Store(void):haveValue(0){}
template <class T>
T Store<T>::GetElem(void){
	if(haveValue==0)
	{
		cout<<"No item present!"<<endl;
		exit(1);
	}
	return item;
}


template <class T>
void Store<T>::PutElem(T x){
	haveValue++;
	item=x;
}
void main(){
	Student g={1000,23};
	Store<int> S1,S2;
	Store<Student> S3;
	Store<double> D;
	S1.PutElem(3);
	S2.PutElem(-7);
	cout<<S1.GetElem()<<"  "<<S2.GetElem()<<endl;
	S3.PutElem(g);
	cout<<"The student id is"<<S3.GetElem().id<<endl;
	cout<<"Retrieving object D";
	cout<<D.GetElem()<<endl;
}