A generic stack class - Beginners / Lab Assignments Source Code in C++

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Home » C++ Home » Beginners / Lab Assignments Home » A generic stack class

A D V E R T I S E M E N T

Title	A generic stack class
Author	Sourav Datta
Author Email	soura_jagat [at] yahoo.com
Description
Category	C++ » Beginners / Lab Assignments
Hits	390978
Code	Select and Copy the Code
#include <iostream> #include <new> #include <string> #include <sstream> using namespace std; #if !defined __STACK_H #define __STACK_H namespace stk{ template<class T> class Stack; // Forward declaration of Stack class for overloaded << operator template<class T> ostream& operator<<(ostream &,Stack<T> &); // template declaration of << operator template<class T> class Stack{ private: T p; int top,length; string str()const; public: Stack(); Stack(const int); Stack(const Stack<T>&); ~Stack(); void push(T); T pop(); int get_length()const; bool is_empty()const; Stack<T> operator=(const Stack<T>&); // only for basic types friend ostream& operator<< <>(ostream&,Stack<T> &); class StackException{ private: string desc; public: StackException(string exp){ desc="Exception : "+exp; } string get_exp(){ return desc; } }; }; template<class T> Stack<T>::Stack(){ top=-1; length=0; p=0; } template<class T> Stack<T>::Stack(const int size){ top=-1; length=size; try{ p=new T[length]; }catch(bad_alloc ba){ cout<<"Memory can not be alllocated "; return; } } template<class T> Stack<T>::Stack(const Stack<T> &o){ top=o.top; length=o.length; try{ p=new T[length]; }catch(bad_alloc ba){ cout<<"Memory allocation failed "; return; } for(int i=0;i<length;i++) p[i]=o.p[i]; } template<class T> Stack<T>::~Stack(){ if(p!=0) delete [] p; } template<class T> void Stack<T>::push(T elem){ if(p==0){ try{ p=new T[1]; }catch(bad_alloc ba){ throw StackException("Memory fault "); } length++; top++; p[top]=elem; } else if(top==(length-1)){ T q; try{ q=new T[length+1]; }catch(bad_alloc ba1){ throw StackException("Memory fault "); } for(int i=0;i<length;i++) q[i]=p[i]; length++; top++; q[top]=elem; delete [] p; p=q; } else{ top++; p[top]=elem; } } template<class T> T Stack<T>::pop(){ if(p==0 \|\| top==-1){ throw StackException("Stack empty! "); } T ret=p[top]; top--; length--; if(top==-1){ delete [] p; p=0; } else{ T q; try{ q=new T[length]; }catch(bad_alloc ba){ throw StackException("Memory fault "); } for(int i=0;i<length;i++) q[i]=p[i]; delete [] p; p=q; } return ret; } template<class T> int Stack<T>::get_length()const{ return length; } template<class T> bool Stack<T>::is_empty()const{ return ((p==0)? true : false); } template<class T> string Stack<T>::str()const{ // private member function if(p==0) return string(""); stringstream ss; for(int i=0;i<length;i++){ ss << p[i]; if(i!=(length-1)) ss << ", "; } //ss<<" "; return ss.str(); } template<class T> Stack<T> Stack<T>::operator=(const Stack<T> &stk){ length=stk.length; top=stk.top; if(p!=0) delete [] p; try{ p=new T[length]; }catch(bad_alloc ba){ throw StackException("Memory fault in copying! "); } for(int i=0;i<length;i++) p[i]=stk.p[i]; return this; } template<class T> ostream& operator<<(ostream &o,Stack<T> &s){ o<<s.str(); return o; } } // namespace stk; #endif

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