异常类的构建——5个子类构建

1.Exception.h 中增加ArithmetricException类

class ArithmetricException:public Exception
{
public:
    ArithmetricException():Exception(0) {}   //我认为这个实现没有必要
    ArithmetricException(const char* message):Exception(message) {}
    ArithmetricException(const char* file, int line):Exception(file, line) {}
    ArithmetricException(const char* message, const char* file, int line):Exception(message,file,line) {}

    ArithmetricException(const ArithmetricException& e):Exception(e) {}
    ArithmetricException& operator = (const ArithmetricException& e)
    {
        Exception::operator =(e);

        return *this;
    }

};

2.Exception.h 中增加NullPointerException类

class NullPointerException:public Exception
{
public:
    NullPointerException():Exception(0) {}   //我认为这个实现没有必要
    NullPointerException(const char* message):Exception(message) {}
    NullPointerException(const char* file, int line):Exception(file, line) {}
    NullPointerException(const char* message, const char* file, int line):Exception(message,file,line) {}

    NullPointerException(const NullPointerException& e):Exception(e) {}
    NullPointerException& operator = (const NullPointerException& e)
    {
        Exception::operator =(e);

        return *this;
    }

};

3.Exception.h 中增加IndexOutOfBoundsException类

class IndexOutOfBoundsException:public Exception
{
public:
    IndexOutOfBoundsException():Exception(0) {}   //我认为这个实现没有必要
    IndexOutOfBoundsException(const char* message):Exception(message) {}
    IndexOutOfBoundsException(const char* file, int line):Exception(file, line) {}
    IndexOutOfBoundsException(const char* message, const char* file, int line):Exception(message,file,line) {}

    IndexOutOfBoundsException(const IndexOutOfBoundsException& e):Exception(e) {}
    IndexOutOfBoundsException& operator = (const IndexOutOfBoundsException& e)
    {
        Exception::operator =(e);

        return *this;
    }

};

4.Exception.h 中增加NoEnoughMemoryException类

class NoEnoughMemoryException:public Exception
{
public:
    NoEnoughMemoryException():Exception(0) {}   //我认为这个实现没有必要
    NoEnoughMemoryException(const char* message):Exception(message) {}
    NoEnoughMemoryException(const char* file, int line):Exception(file, line) {}
    NoEnoughMemoryException(const char* message, const char* file, int line):Exception(message,file,line) {}

    NoEnoughMemoryException(const NoEnoughMemoryException& e):Exception(e) {}
    NoEnoughMemoryException& operator = (const NoEnoughMemoryException& e)
    {
        Exception::operator =(e);

        return *this;
    }

};

5.Exception.h 中增加InvalidParameterException类

class InvalidParameterException:public Exception
{
public:
    InvalidParameterException():Exception(0) {}   //我认为这个实现没有必要
    InvalidParameterException(const char* message):Exception(message) {}
    InvalidParameterException(const char* file, int line):Exception(file, line) {}
    InvalidParameterException(const char* message, const char* file, int line):Exception(message,file,line) {}

    InvalidParameterException(const InvalidParameterException& e):Exception(e) {}
    InvalidParameterException& operator = (const InvalidParameterException& e)
    {
        Exception::operator =(e);

        return *this;
    }

};

main.cpp

#include <iostream>
#include "Exception.h"

using namespace std;
using namespace DTLib;


int main()
{
    try
    {
        THROW_EXCEPTION(ArithmetricException,"test");
    }

    catch(const ArithmetricException& e)
    {
        cout << " catch(const ArithmetricException& e)" << endl;
        cout << e.message() << endl;
        cout << e.location() << endl;
    }

    catch(const Exception& e)
    {
        cout << " catch(const Exception& e)" << endl;
        cout << e.message() << endl;
        cout << e.location() << endl;
    }
    return 0;
}

设计原则：
在可复用代码库设计时，尽量使用面向对象技术进行架构，尽量使用异常处理机制分离正常逻辑和异常逻辑