异常学习

#include<exception>
#include<iostream>
usingnamespacestd;

voidterminator()...{
cout<<"I'llbeback!"<<endl;
exit(0);
}

void(*old_terminate)()=set_terminate(terminator);

classBotch...{
public:
classFruit...{};
voidf()...{
cout<<"Botch::f()"<<endl;
throwFruit();
}
~Botch()...{throw'c';}
};

intmain()...{
try...{
Botchb;
b.f();
}catch(...)...{
cout<<"insidecatch(...)"<<endl;
}
}/**////:~

没catch的异常可以用set_terminate来处理。同时，可以看出在析构函数里抛异常是很郁闷的一件事情。


如果在生成对象时候产生异常，会自己析购已经生成的，而产生异常的那一次生成，没有调用析构函数。

//:C01:Cleanup.cpp
//Exceptionscleanupcompleteobjectsonly.
#include<iostream>
usingnamespacestd;

classTrace...{
staticintcounter;
intobjid;
public:
Trace()...{
objid=counter++;
cout<<"constructingTrace#"<<objid<<endl;
if(objid==3)throw3;
}
~Trace()...{
cout<<"destructingTrace#"<<objid<<endl;
}
};

intTrace::counter=0;

intmain()...{
try...{
Tracen1;
//Throwsexception:
Tracearray[5];
Tracen2;//Won'tgethere.
}catch(inti)...{
cout<<"caught"<<i<<endl;
}
}/**////:~