//第二十四章 异常和错误处理 6异常类与模板的关系
#include <iostream>
using namespace std;
const int num=5;
class wrong{};
template<class T>
class people
{
public:people(int Size=num);~people(){ delete []p; };int&operator[](int off);const int&operator[](int off)const;int GetSize()const{ return size;}//class wrong{};class offset{public:offset(int Size):osize(Size){};~offset(){};virtual int Get(){ return osize;}virtual void show(){cout<<"丢出offset异常"<<endl;cout<<"下标值"<<osize<<"出错"<<endl;}protected:int osize;};class Big:public offset{public:Big(int Size):offset(Size){}virtual void show(){cout<<"丢出Big异常"<<endl;cout<<"下标值为"<<offset::osize<<endl;}}; class Nav:public offset{public:Nav(int Size):offset(Size){}virtual void show(){cout<<"丢出Nav异常"<<endl;cout<<"下标值为"<<offset::osize<<endl;}}; class Small{public:Small(int Size):_size(Size){}~Small(){}virtual int Get(){ return _size;}virtual void show(){cout<<"丢出Small异常"<<endl;cout<<"下标值为:"<<_size<<endl;}protected:int _size;};class Zero: public Small{public:Zero(int Size):Small(Size){}virtual void show(){cout<<"丢出Small异常"<<endl;cout<<"下标值为:"<<Small::_size<<endl;}};
private:int *p;int size;
};
template <class T>
people<T>::people(int Size):size(Size)
{cout<<"调用构造函数"<<endl;if(Size == 0){throw Zero(Size);}if(Size < 10){throw Small(Size);}if(Size > 10000){throw Big(Size);}if(Size < 1){throw Nav(Size);}p = new int[Size];for(int i=0; i<Size; i++){p[i] = 0;}
}
template <class T>
int&people<T>::operator[](int off)
{if(off>=0 && off < GetSize()){return p[off];}throw wrong();return p[0];
}//一样，只是该函数内的值是不可更改并且返回值也是不可更改的
template <class T>
const int&people<T>::operator[](int off)const
{int Size = GetSize();if(off>=0 && off < GetSize()){return p[off];}throw wrong();return p[0];
}int main()
{try{people<int> one(9);for(int i=0; i<100; i++){one[i] = i;cout<<"one["<<i<<"]:"<<i<<endl;}}catch(wrong){cout<<"超过数组长度，不能继续进行赋值操作"<<endl;}catch(people<int>::Big big){//cout<<"数组值过大,值为:"<<big.Get()<<endl;big.show();}catch(people<int>::Small small){//cout<<"数组值过小,值为:"<<small.Get()<<endl;small.show();}catch(people<int>::Zero zero){//cout<<"下标值为0"<<endl;zero.show();}catch(people<int>::Nav nav){// cout<<"下标值为负数"<<endl;nav.show();}catch(people<int>::offset offset){//cout<<"下标值过大或者过小"<<endl;offset.show();}return 0;
}