stackl.cpp

来自「Data Abstraction & Problem Solving with 」· C++ 代码 · 共 73 行

// *********************************************************
// Implementation file StackL.cpp for the ADT stack.
// ADT list implementation.
// *********************************************************
#include "StackL.h"    // header file

Stack::Stack()
{
}  // end default constructor

Stack::Stack(const Stack& aStack): aList(aStack.aList)
{
}  // end copy constructor

Stack::~Stack()
{
}  // end destructor

bool Stack::isEmpty() const
{
   return aList.isEmpty();
}  // end isEmpty

void Stack::push(StackItemType newItem) throw(StackException)
{
   try
   {
      aList.insert(1, newItem);
   } // end try
   catch (ListException e)
   {
      throw StackException("StackException: cannot push item");
   } // end catch
}  // end push

void Stack::pop() throw(StackException)
{
   try
   {
      aList.remove(1);
   } // end try
   catch (ListIndexOutOfRangeException e)
   {
      throw StackException("StackException: stack empty on pop");
   } // end catch
}  // end pop

void Stack::pop(StackItemType& stackTop) throw(StackException)
{
   try
   {
      aList.retrieve(1, stackTop);
      aList.remove(1);
   } // end try
   catch (ListIndexOutOfRangeException e)
   {
      throw StackException("StackException: stack empty on pop");
   } // end catch
}  // end pop

void Stack::getTop(StackItemType& stackTop) const throw(StackException)
{
   try
   {
      aList.retrieve(1, stackTop);
   } // end try
   catch (ListIndexOutOfRangeException e)
   {
      throw StackException("StackException: stack empty on getTop");
   } // end catch
}  // end getTop
// End of implementation file.