Re: std::vector::operator[] throws exception

From:
Deane Yang <yang2w@earthlink.net>
Newsgroups:
comp.lang.c++.moderated
Date:
30 Jul 2006 22:58:20 -0400
Message-ID:
<hydzg.2221$0e5.587@newsread4.news.pas.earthlink.net>
{ for questions specific to VC++ please consider posting
  to 'microsoft.public.vc.language' newsgroup. -mod }

James Kanze wrote:

Deane Yang wrote:
  > I was surprised to learn recently that code like

  > std::vector<int> v(3);
  > v[3] = 10;

  > compiled with VC++ 8.0 and the STL library that comes with it
  > throws an exception when run.

  > Does this conform to the official specification of std::vector?

  > No exception is thrown if compiled with cygwin gcc.

I get a core dump with g++ under Linux or Solaris. At least
with debug options turned on.


First, I misspoke, and this is not so different from VC++ does. To be
precise, VC++ invokes an "invalid parameter handler", which by default
terminates the program. There is no exception thrown.

But what is different is that VC++ does this even with programs compiled
in release mode. Can someone explain to me why this is desirable default
behavior?

Deane

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