Re: [boost] std::exception -- Re: Re: Re: Re: Re:AttemptingresolutionofThreads&ExceptionsIssue

From: Peter Dimov (pdimov_at_[hidden])
Date: 2002-08-14 12:53:49

From: "Victor A. Wagner, Jr." <vawjr_at_[hidden]>
> >
> >Well, I am not a compiler writer, but it seems to me that to implement
> >"throw;" and "catch", the compiler already needs a way to copy the
> >exception, complete with its original type. :-)
> 
> I don't see that at all.  The catch() clause specifies the type it's 
> expecting and it will be copied and sliced if need be to match.

Quiz: what does this program do?

#include <iostream>

struct X
{
};

struct Y: public X
{
};

void f()
{
    try
    {
        throw Y();
    }
    catch(X)
    {
        throw;
    }
}

int main()
{
    try
    {
        f();
    }
    catch(Y)
    {
        std::cout << "Caught an Y!\n";
    }
}