Templates Generics 模板范型

Generic Class using Template:

#include <iostream> 
using namespace std; 
 
template <typename T> 
class Array { 
private: 
    T* ptr; 
    int size; 
 
public: 
    Array(T arr[], int s); 
    void print(); 
}; 
 
template <typename T> 
Array<T>::Array(T arr[], int s) 
{ 
    ptr = new T[s]; 
    size = s; 
    for (int i = 0; i < size; i++) 
        ptr[i] = arr[i]; 
} 
 
template <typename T> 
void Array<T>::print() 
{ 
    for (int i = 0; i < size; i++) 
        cout << " " << *(ptr + i); 
    cout << endl; 
} 
 
int main() 
{ 
    int arr[5] = { 1, 2, 3, 4, 5 }; 
    Array<int> a(arr, 5); 
    a.print(); 
    return 0; 
} 

// C++ Program to demonstrate
// Use of template
#include <iostream>
using namespace std;
 
// One function works for all data types. This would work
// even for user defined types if operator '>' is overloaded
template <typename T> T myMax(T x, T y)
{
    return (x > y) ? x : y;
}
 
int main()
{
    // Call myMax for int
    cout << myMax<int>(3, 7) << endl;
    // call myMax for double
    cout << myMax<double>(3.0, 7.0) << endl;
    // call myMax for char
    cout << myMax<char>('g', 'e') << endl;
 
    return 0;
}