异常学习

#include < exception >
#include < iostream >
using namespace std;

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

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

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

int main() ... {
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 >
using namespace std;

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

int Trace::counter = 0 ;

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