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/*----------------------------------------------------------------------------+
| Author: Jerome Richards |
| |
| Assignment: Project 9 |
| File: stackrep.h |
| |
| Instructor: Dr. Roger deBry |
| Class: CNS-1350 Section X01 |
| |
| Date Written: March 20, 2005 |
| |
| Description: CStack representation class definition |
+----------------------------------------------------------------------------*/
#ifndef stackrepH
#define stackrepH
using namespace std;
template< class T >
class CStackrep
{
private:
static int defaultGrowth;
int itsTop;
int itsSize;
T* itsData;
public:
/*----------------------------------------------------------------------------+
| Purpose: Initialize the CStackrep class object |
| |
| Parameters: initSize is an integer specifying the inital size for the |
| stack |
| |
| Returns: nothing |
| |
| Pre-conditions: initSize >= 5 |
| |
| Post-conditions: none |
+----------------------------------------------------------------------------*/
CStackrep( int initSize = 5 );
/*----------------------------------------------------------------------------+
| Purpose: Release any dynamically allocated memory |
| |
| Parameters: none |
| Returns: nothing |
| |
| Pre-conditions: none |
| Post-conditions: none |
+----------------------------------------------------------------------------*/
~CStackrep();
/*----------------------------------------------------------------------------+
| Purpose: Place the value on the top of the stack |
| |
| Parameters: theData an integer to be stored on the stack |
| Returns: nothing |
| |
| Pre-conditions: none |
| Post-conditions: none |
+----------------------------------------------------------------------------*/
void push( T theData );
/*----------------------------------------------------------------------------+
| Purpose: Remove the top value from the stack |
| |
| Parameters: none |
| Returns: nothing |
| |
| Pre-conditions: none |
| Post-conditions: none |
+----------------------------------------------------------------------------*/
void pop();
/*----------------------------------------------------------------------------+
| Purpose: Return the top value on the stack |
| |
| Parameters: none |
| Returns: an integer |
| |
| Pre-conditions: none |
| Post-conditions: none |
+----------------------------------------------------------------------------*/
T top();
/*----------------------------------------------------------------------------+
| Purpose: Return the size of the stack |
| |
| Parameters: none |
| Returns: an integer |
| |
| Pre-conditions: none |
| Post-conditions: none |
+----------------------------------------------------------------------------*/
int stackSize();
/*----------------------------------------------------------------------------+
| Purpose: Return the amount of free space on the stack |
| |
| Parameters: none |
| Returns: an integer |
| |
| Pre-conditions: none |
| Post-conditions: none |
+----------------------------------------------------------------------------*/
int freeSpace();
};
class CEmptyStackException
{
private:
string itsErrDesc;
public:
CEmptyStackException( string errMsg );
~CEmptyStackException();
string what();
};
template< typename T > int CStackrep<T>::defaultGrowth = 5;
template< class T >
CStackrep< T >::CStackrep( int initSize )
{
initSize = initSize < defaultGrowth ? defaultGrowth : initSize;
itsData = new T[ initSize ];
itsSize = initSize;
itsTop = -1;
}
template< class T >
CStackrep< T >::~CStackrep()
{
assert( itsData != NULL );
delete[] itsData;
itsData = NULL;
}
template< class T >
void CStackrep< T >::push( T theData )
{
assert( itsData != NULL );
itsTop++;
// stack is too small - expand it
if( itsTop >= itsSize )
{
T* tmpData = new T[ itsSize + defaultGrowth ];
assert( tmpData != NULL );
for( int i = 0; i < itsSize; i++ )
*(tmpData + i) = *(itsData + i);
delete[] itsData;
itsData = tmpData;
itsSize += defaultGrowth;
}
*(itsData+itsTop) = theData;
}
template< class T >
void CStackrep< T >::pop()
{
assert( itsData != NULL );
if( itsTop >=0 )
itsTop--;
else
throw CEmptyStackException( "Stack Exception: Tried to POP an element from an empty stack." );
}
template< class T >
T CStackrep< T >::top()
{
assert( itsData != NULL );
if( itsTop >= 0 )
return *(itsData + itsTop);
else
throw CEmptyStackException( "Stack Exception: Tried to READ an element from an empty stack." );
}
template< class T >
int CStackrep< T >::stackSize()
{
assert( itsData != NULL );
return itsSize;
}
template< class T >
int CStackrep< T >::freeSpace()
{
assert( itsData != NULL );
int tmpFree = itsSize;
if( itsTop >= 0 )
tmpFree -= (itsTop + 1);
return tmpFree;
}
CEmptyStackException::CEmptyStackException( string errText )
{
itsErrDesc = errText;
}
CEmptyStackException::~CEmptyStackException()
{
}
string CEmptyStackException::what()
{
return itsErrDesc;
}
#endif