4elist2006.cpp

《21天学通C＋＋》附盘的原代码。书上的每个例子在这里都有相应的C语言程序。

#include <iostream>
using namespace std;

const int DefaultSize = 10;
class xBoundary {};

template <class T>
class Array
{
public:
	// constructors
	Array(int itsSize = DefaultSize);
	Array(const Array &rhs);
	~Array() { delete [] pType;}

	// operators
	Array& operator=(const Array<T>&);
	T& operator[](int offSet);
	const T& operator[](int offSet) const;

	// accessors
	int GetitsSize() const { return itsSize; }

	// friend function
	friend ostream& operator<< (ostream&, const Array<T>&);

	// define the exception classes

	class xSize {};

private:
	int *pType;
	int  itsSize;
};

template <class T>
Array<T>::Array(int size):
	itsSize(size)
{
	if (size <10 || size > 30000)
		throw xSize();
	pType = new T[size];
	for (int i = 0; i<size; i++)
		pType[i] = 0;
}

template <class T>
Array<T>& Array<T>::operator=(const Array<T> &rhs)
{
	if (this == &rhs)
		return *this;
	delete [] pType;
	itsSize = rhs.GetitsSize();
	pType = new T[itsSize];
	for (int i = 0; i<itsSize; i++)
		pType[i] = rhs[i];
}
template <class T>
Array<T>::Array(const Array<T> &rhs)
{
	itsSize = rhs.GetitsSize();
	pType = new T[itsSize];
	for (int i = 0; i<itsSize; i++)
		pType[i] = rhs[i];
}

template <class T>
T& Array<T>::operator[](int offSet)
{
	int size = GetitsSize();
	if (offSet >= 0 && offSet < GetitsSize())
		return pType[offSet];
	throw xBoundary();
	return pType[0];
}

template <class T>
const T& Array<T>::operator[](int offSet) const
{
	int mysize = GetitsSize();
	if (offSet >= 0 && offSet < GetitsSize())
		return pType[offSet];
	throw xBoundary();
}

template <class T>
ostream& operator<< (ostream& output, const Array<T>& theArray)
{
	for (int i = 0; i<theArray.GetitsSize(); i++)
		output << "[" << i << "] " << theArray[i] << endl;
	return output;
}


int main()
{
	try
	{
		Array<int> intArray(9);
		for (int j = 0; j< 100; j++)
		{
			intArray[j] = j;
			cout << "intArray[" << j << "] okay..." << endl;
		}
	}
	catch (xBoundary)
	{
		cout << "Unable to process your input!\n";
	}
	catch (Array<int>::xSize)
	{
		cout << "Bad Size!\n";
	}

	cout << "Done.\n";
	return 0;
}