main.cpp

/* 
 * File:   main.cpp
 * Author: Developer
 *
 * Created on January 12, 2017, 12:59 PM
 */

#include <cstdlib>
#include <iostream>
#include <vector>
#include <string>
#include <stdexcept>

using namespace std;

template <class T>
class Stack { 
   private: 
      vector<T> elems;     // elements 

   public: 
      void push(T const&);  // push element 
      void pop();               // pop element 
      T top() const;            // return top element 
      bool empty() const{       // return true if empty.
         return elems.empty(); 
      } 
}; 

template <class T>
void Stack<T>::push (T const& elem) { 
   // append copy of passed element 
   elems.push_back(elem);    
} 

template <class T>
void Stack<T>::pop () { 
   if (elems.empty()) { 
      throw out_of_range("Stack<>::pop(): empty stack"); 
   }
	
   // remove last element 
   elems.pop_back();         
} 

template <class T>
T Stack<T>::top () const { 
   if (elems.empty()) { 
      throw out_of_range("Stack<>::top(): empty stack"); 
   }
	
   // return copy of last element 
   return elems.back();      
} 

int main() { 
   try { 
      Stack<int>         intStack;  // stack of ints 
      Stack<string> stringStack;    // stack of strings 

      // manipulate int stack 
      intStack.push(7); 
      cout << intStack.top() <<endl; 

      // manipulate string stack 
      stringStack.push("hello"); 
      cout << stringStack.top() << std::endl; 
      stringStack.pop(); 
      cout << stringStack.top() << std::endl; 
      stringStack.pop(); 
   }catch (exception const& ex) { 
      cerr << "Exception: " << ex.what() <<endl; 
      return -1;
   } 
}