Re: Positioning of catch(...)

From:
James Kanze <james.kanze@gmail.com>
Newsgroups:
comp.lang.c++
Date:
Mon, 13 Oct 2008 10:12:05 -0700 (PDT)
Message-ID:
<1c7ed83f-b660-45de-8648-bca15d782410@d70g2000hsc.googlegroups.com>
On Oct 13, 6:39 pm, Erik Wikstr=F6m <Erik-wikst...@telia.com> wrote:

On 2008-10-13 18:36, Juha Nieminen wrote:

Kai-Uwe Bux wrote:

That says that a program where catch(...) is not the last
handler in a block is ill-formed ("shall").


What does "ill-formed" mean in practice? Does it have
something to do with "undefined behavior"?


I believe that ill-formed code is not required to compile,
while undefined behaviour refers to the run-time behaviour
(which means that the code did compile).


Sort of. Ill-formed means that the compiler must issue a
diagnostic. Having done so, it is free to compile the code if
it wishes. (Good compilers generally don't.) Undefined
behavior means just that---whatever the compiler does with the
code is correct as far as the standard is concerned. It may
refuse to compile it (with or without an error message); it may
compile it do something that works; or it may compile it to do
anything else.

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