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From: mjv@objects.mv.com (Michael J. Vilot)
Newsgroups: comp.lang.c++
Subject: Re: Exception handling
Message-ID: <958@zinn.MV.COM>
Date: 3 Oct 90 15:43:09 GMT
Sender: nuucp@zinn.MV.COM
Lines: 42

David Masterson asked for an example of exception handling with constructor
failures:

  int f() throw(X);
  int g() throw(Y);
  
  class A {
    int a_part;
  public:
    A() { a_part = f(); }
    ...
  };
  
  class B : public A {
    int b_part;
  public:
    B() /* A() invoked */ { b_part = g(); }
    ...
  };
  
  main()
  {
    try {
      B b;
    }
    catch(X) {
      // we get here if f() failed while building b.a_part
      // b.b_part not attempted
    }
    catch(Y) {
      // we get here if g() failed while building b.b_part
      // note that if `a_part' had been of a class with a 
      // destructor, then that destructor would have been executed
    }
  }
  
  [My aplogies to everyone -- my earlier posting re-sent his question,
   instead of my response.]

--
Mike Vilot,  ObjectWare Inc, Nashua NH
mjv@objects.mv.com  (UUCP:  ...!decvax!zinn!objects!mjv)