函数模板

#include<bits/stdc++.h>
using namespace std;
/**
 * 函数模板
 * */
template<class T>
void my_swap(T &a, T &b) {
    T temp;
    temp = a;
    a = b;
    b = temp;
}
int main() {
    int a = 1, b = 2;
    my_swap(a, b);
    printf("a=%d b=%d\n", a, b);
    double c = 1.535, d = 2.55;
    my_swap(c, d);
    printf("c=%.2f d=%.2f\n", c, d);
    return 0;
}

类模板

#include<bits/stdc++.h>
using namespace std;
/**
 * 类模板
 * */
template<class T>
class Trray {
    public:
        Trray(int siz = 1) {
            this->siz = siz;
            aptr = new T[siz];
        }
        void fill_array();
        void dis_array();
        ~Trray() {
            delete []aptr;
        }
    private:
        int siz;
        T *aptr;
};
template<class T> 
void Trray<T>::fill_array() {
    printf("please input %d data\n", siz);
    for(int i = 0; i < siz; i++) {
        printf("the %d data", i+1);
        cin>>aptr[i];
    }
}
template<class T>
void Trray<T>::dis_array() {
    for(int i = 0; i < siz; i++) {
        cout<<aptr[i]<<" ";
    }
    cout<<endl;
}
int main() {
    Trray<char> ac(3);
    ac.fill_array();
    ac.dis_array();
    Trray<float>af(3);
    af.fill_array();
    af.dis_array();
    return 0;
}

类模板派生

#include<bits/stdc++.h>
using namespace std;
/**
 * 类模板派生
 * */
template<class T>
class A {
    public:
        void showA(T a) {
            cout<<a<<endl;
        }
};
template<class X, class Y> 
class B: public A<Y> {
    public:
        void showB(X b) {
            cout<<b<<endl;
        }
};
int main() {
    B<char, int> b;
    b.showA(10);
    b.showB('c');
    return 0;
}