usage of templates c++ code example

Example 1: use of template in c++

// If two characters are passed to function template, character with larger ASCII value is displayed.

#include <iostream>
using namespace std;

// template function
template <typename T>
T Large(T n1, T n2)
{
	return (n1 > n2) ? n1 : n2;
}

int main()
{
	int i1, i2;
	float f1, f2;
	char c1, c2;

	cout << "Enter two integers:\n";
	cin >> i1 >> i2;
	cout << Large(i1, i2) <<" is larger." << endl;

	cout << "\nEnter two floating-point numbers:\n";
	cin >> f1 >> f2;
	cout << Large(f1, f2) <<" is larger." << endl;

	cout << "\nEnter two characters:\n";
	cin >> c1 >> c2;
	cout << Large(c1, c2) << " has larger ASCII value.";

	return 0;
}

Example 2: templates of templates c++

namespace std {
  template<typename t> struct hash<MyClass<t>>
  {
  	size_t operator() (const MyClass<t>& c) const;
  }
}

// You can also do things like

template<template<typename t> class type> func_name<type<t>>();