C++异常机制+DAY12（异常的层次结构）

最新推荐文章于 2022-01-04 01:39:45 发布

原创最新推荐文章于 2022-01-04 01:39:45 发布 · 149 阅读

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本文介绍了一个使用C++实现的数组类MyArray，该类在构造函数中通过抛出自定义异常类来检查数组长度的有效性，包括负数、零、过大或过小的情况。文章详细展示了如何定义和使用这些自定义异常类，并在main函数中演示了如何捕获和处理这些异常。

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#include <iostream>
using namespace std;

class MyArray
{
public:
	MyArray(int len);
	~MyArray();
public:
	int & operator[](int index);
	int getLen();

	class eSize
	{
	public:
		eSize(int size)
		{
			m_size = size;
		}
		virtual void printErr()
		{
			cout << "size:" << m_size << " ";
		}
	protected:
		int m_size;
	};
	class eNegative : public eSize
	{
	public:
		eNegative(int size) : eSize(size)
		{
			;
		}
		virtual void printErr()
		{
			cout << "eNegative 类型 size:" << m_size << " ";
		}
	};
	class eZero : public eSize
	{
	public:
		eZero(int size) : eSize(size)
		{
			;
		}
		virtual void printErr()
		{
			cout << "eZero 类型 size:" << m_size << " ";
		}
	};
	class eTooBig : public eSize
	{
	public:
		eTooBig(int size) : eSize(size)
		{
			;
		}
		virtual void printErr()
		{
			cout << "eTooBig 类型 size:" << m_size << " ";
		}
	};
	class eTooSmall : public eSize
	{
	public:
		eTooSmall(int size) : eSize(size)
		{
			;
		}
		virtual void printErr()
		{
			cout << "eTooSmall 类型 size:" << m_size << " ";
		}
	};

private:
	int *m_space;
	int m_len;
};


MyArray::MyArray(int len)
{
	if (len  < 0)
	{
		throw eNegative(len);
	}
	else if (len == 0)
	{
		throw eZero(len);
	}
	else if (len > 1000)
	{
		throw eTooBig(len);
	}
	else if (len < 3)
	{
		throw eTooSmall(len);
	}
	m_len = len;
	m_space = new int[len];
}

MyArray::~MyArray()
{
	if (m_space != NULL)
	{
		delete [] m_space;
		m_space = NULL;
		m_len = 0;
	}
}

int & MyArray::operator[](int index)
{
	return m_space[index];
}

int MyArray::getLen()
{
	return m_len;
}

void main()
{

	try
	{
		MyArray a(-5);
		for (int i=0; i<a.getLen(); i++)
		{
			a[i] = i+1;
			printf("%d ", a[i]);
		}
	}
	catch(MyArray::eSize &e)
	{
		//cout <<  "len的大小: " << e.eSize();
		e.printErr();
	}
	catch (...)
	{
	}


	cout<<"hello..."<<endl;
	system("pause");
	return ;
}

// 不推荐
void main51()
{
	
	try
	{
		MyArray a(-5);
		for (int i=0; i<a.getLen(); i++)
		{
			a[i] = i+1;
			printf("%d ", a[i]);
		}
	}
	catch(MyArray::eNegative e)
	{
		cout << "eNegative 类型异常" << endl;
	}
	catch(MyArray::eZero e)
	{
		cout << "eZero 类型异常" << endl;
	}
	catch(MyArray::eTooBig e)
	{
		cout << "eTooBig 类型异常" << endl;
	}
	catch(MyArray::eTooSmall e)
	{
		cout << "eTooSmall 类型异常" << endl;
	}
	
	catch (...)
	{
	}
	

	cout<<"hello..."<<endl;
	system("pause");
	return ;
}