我需要将以下 ADT Bag 从使用数组转换为使用向量。我一直在尝试这样做，但无法让程序正常工作。我将如何改变这个？
头文件
#ifndef _ARRAY_BAG
#define _ARRAY_BAG
#include "BagInterface.h"
template<class ItemType>
class ArrayBag : public BagInterface<ItemType>
{
private:
static const int DEFAULT_CAPACITY = 6; // Small size to test for a full bag
ItemType items[DEFAULT_CAPACITY]; // Array of bag items
int itemCount; // Current count of bag items
int maxItems; // Max capacity of the bag
// Returns either the index of the element in the array items that
// contains the given target or -1, if the array does not contain
// the target.
int getIndexOf(const ItemType& target) const;
public:
ArrayBag();
int getCurrentSize() const;
bool isEmpty() const;
bool add(const ItemType& newEntry);
bool remove(const ItemType& anEntry);
void clear();
bool contains(const ItemType& anEntry) const;
int getFrequencyOf(const ItemType& anEntry) const;
vector<ItemType> toVector() const;
}; // end ArrayBag
#include "ArrayBag.cpp"
#endif
.cpp 文件
#include "ArrayBag.h"
#include <cstddef>
template<class ItemType>
ArrayBag<ItemType>::ArrayBag(): itemCount(0), maxItems(DEFAULT_CAPACITY)
{
} // end default constructor
template<class ItemType>
int ArrayBag<ItemType>::getCurrentSize() const
{
return itemCount;
} // end getCurrentSize
template<class ItemType>
bool ArrayBag<ItemType>::isEmpty() const
{
return itemCount == 0;
} // end isEmpty
template<class ItemType>
bool ArrayBag<ItemType>::add(const ItemType& newEntry)
{
bool hasRoomToAdd = (itemCount < maxItems);
if (hasRoomToAdd)
{
items[itemCount] = newEntry;
itemCount++;
} // end if
return hasRoomToAdd;
} // end add
/*
// STUB
template<class ItemType>
bool ArrayBag<ItemType>::remove(const ItemType& anEntry)
{
return false; // STUB
} // end remove
*/
template<class ItemType>
bool ArrayBag<ItemType>::remove(const ItemType& anEntry)
{
int locatedIndex = getIndexOf(anEntry);
bool canRemoveItem = !isEmpty() && (locatedIndex > -1);
if (canRemoveItem)
{
itemCount--;
items[locatedIndex] = items[itemCount];
} // end if
return canRemoveItem;
} // end remove
/*
// STUB
template<class ItemType>
void ArrayBag<ItemType>::clear()
{
// STUB
} // end clear
*/
template<class ItemType>
void ArrayBag<ItemType>::clear()
{
itemCount = 0;
} // end clear
template<class ItemType>
int ArrayBag<ItemType>::getFrequencyOf(const ItemType& anEntry) const
{
int frequency = 0;
int curIndex = 0; // Current array index
while (curIndex < itemCount)
{
if (items[curIndex] == anEntry)
{
frequency++;
} // end if
curIndex++; // Increment to next entry
} // end while
return frequency;
} // end getFrequencyOf
template<class ItemType>
bool ArrayBag<ItemType>::contains(const ItemType& anEntry) const
{
return getIndexOf(anEntry) > -1;
} // end contains
/* ALTERNATE 1: First version
template<class ItemType>
bool ArrayBag<ItemType>::contains(const ItemType& target) const
{
return getFrequencyOf(target) > 0;
} // end contains
// ALTERNATE 2: Second version
template<class ItemType>
bool ArrayBag<ItemType>::contains(const ItemType& anEntry) const
{
bool found = false;
int curIndex = 0; // Current array index
while (!found && (curIndex < itemCount))
{
if (anEntry == items[curIndex])
{
found = true;
} // end if
curIndex++; // Increment to next entry
} // end while
return found;
} // end contains
*/
template<class ItemType>
vector<ItemType> ArrayBag<ItemType>::toVector() const
{
vector<ItemType> bagContents;
for (int i = 0; i < itemCount; i++)
bagContents.push_back(items[i]);
return bagContents;
} // end toVector
// private
template<class ItemType>
int ArrayBag<ItemType>::getIndexOf(const ItemType& target) const
{
bool found = false;
int result = -1;
int searchIndex = 0;
// If the bag is empty, itemCount is zero, so loop is skipped
while (!found && (searchIndex < itemCount))
{
if (items[searchIndex] == target)
{
found = true;
result = searchIndex;
}
else
{
searchIndex++;
} // end if
} // end while
return result;
} // end getIndexOf