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;
}

　　

Templates in C++ with Examples - GeeksforGeeks https://www.geeksforgeeks.org/templates-cpp/

Generics in C++ - GeeksforGeeks https://www.geeksforgeeks.org/generics-in-c/

 

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