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From: AllanW@my-dejanews.com
Subject: Re: a question about temporary exception object
Date: 1998/11/07
Message-ID: <71vr8l$qfm$1@nnrp1.dejanews.com>#1/1
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Approved: Fergus Henderson <fjh@cs.mu.oz.au>
References: <3642A62C.CF2FC315@ccnet.com>
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In article <3642A62C.CF2FC315@ccnet.com>,
  Gilbert Chang <gchang@ccnet.com> wrote:

> // class Foo
> // {
> // public:
> //     Foo();

ADD:     Foo(const Foo&);

> //    ~Foo();
> // };
> //
>
> try
> {
>     throw Foo();
> }
> catch(Foo & foo)
> {
> }
>
> VS.
>
> try
> {
>     throw Foo();
> }
> catch(Foo foo)
> {
> }
>
> I experimented with VC++6.0.  In both cases, the constructor was called
> once, but the destructor was called twice.  Did I do something wrong or
> is the compiler simply broken?

Give Foo a copy constructor, as shown above. The default
constructor was called once, the copy constructor was called
once, and both copies were eventually destructed. This is
correct behavior.

As a rule of thumb, always assume you've made a mistake before
you blame the compiler. There are exceptions to that rule, of
course, but the assumption is the safe way to go.

--
AllanW@my-dejanews.com is a "Spam Magnet" -- never read.
Please reply in USENET only, sorry.

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