Re: heritaged exception features

From:

Victor Bazarov <v.bazarov@comcast.invalid>

Newsgroups:

comp.lang.c++

Date:

Wed, 15 Jun 2011 15:46:35 -0400

Message-ID:

<itb26s$u9m$1@dont-email.me>

On 6/15/2011 3:12 PM, eric wrote:

I tried to copied and test a piece of (simple code) from page 823 of
book (C++ Primer Plus-5th Ed by Stephen Prata). about heritaged
exceptions features.

--------------------------------------
#include<iostream>

using namespace std;

class bad_1 {...};
class bad_2 : public bad_1 {...};
class bad_3 : public bad_2 {...};

Are those ellipses (sets of dots) in your source code *verbatim*? The
example in the book simply didn't want to elaborate on the contents of
those classes (likely), and you have to at least remove those.
Otherwise, it's a simple syntax error. Change those three lines to read:

class bad_1 {};
class bad_2 : public bad_1 {};
class bad_3 : public bad_2 {};

void duper() throw (bad_1) // matches base- and derived-class objects
{
   int oh_no = 1,
       rats = 0,
       drat = 0;

    if (oh_no)
      throw bad_1();
    if (rats)
      throw bad_2();
    if (drat)
      throw bad_3();

}

int main() {
   try {
       duper();
   }

   catch(bad_3) {
     cout<< "\ngoto bad_3\n";
   }

   catch(bad_2) {
     cout<< "\ngoto bad_2\n";
   }

   catch(bad_1) {
     cout<< "\ngoto bad_1\n";
   }

}
----------------------------------------------
but I got compile error:

eric@eric-laptop:~/cpppp5/ch15$ g++ pg823.cpp
pg823.cpp:5:14: error: expected unqualified-id before ?...? token
pg823.cpp:6:29: error: expected unqualified-id before ?...? token
pg823.cpp:7:29: error: expected unqualified-id before ?...? token

plz help , see how to modify (or what kind (unqualified-id) I should
add in somewhere in my simple test program)?
thanks a lot in advance, Eric

V
--
I do not respond to top-posted replies, please don't ask

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