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From: Phil Edwards <phil@jaj.com> To: nobody@gcc.gnu.org Cc: gcc-prs@gcc.gnu.org, Subject: Re: libstdc++/7972: > v.size(), where v is vector, incorrectly returns true Date: Wed, 18 Sep 2002 16:36:00 -0000 [thread overview] Message-ID: <20020918233601.31330.qmail@sources.redhat.com> (raw) The following reply was made to PR libstdc++/7972; it has been noted by GNATS. From: Phil Edwards <phil@jaj.com> To: nathan.holladay@utsouthwestern.edu Cc: gcc-gnats@gcc.gnu.org Subject: Re: libstdc++/7972: > v.size(), where v is vector, incorrectly returns true Date: Wed, 18 Sep 2002 19:29:14 -0400 On Wed, Sep 18, 2002 at 04:13:29PM -0000, nathan.holladay@utsouthwestern.edu wrote: > >Description: > (I am not sure about what the Submitter-Id is.) It's handled automatically if you use the normal bug reporting mechanisms. (And you did.) > It appears that a program will incorrectly return true at least for > an if statement, if(i > v.size()) where i is an integer of some value > less than the size of a vector, v. This exact same problem is found in > Microsoft's Visual C++ 6.0 compiler. I also reported it to them, and noted > the co-existence in the gnu compiler. (It is hard not to conclude that > someone copied from someone else, Faulty logic. The only common code in this case is /yours/. :-) > (I am suspecting that the '>' operator is simply overloaded improperly > for whatever type vector::size() returns.) There's no overloading. The type involved will be something like "unsigned int". % g++-3.2 -Wall -W pr.cc pr.cc:8: warning: ISO C++ forbids declaration of `main' with no type pr.cc: In function `int main()': -> pr.cc:14: warning: comparison between signed and unsigned integer expressions % Declare structnumber as "std::vector<double>::size_type" instead of int, and you won't have this problem. (Yes, some typedefs will help you reducing typing.) Phil -- I would therefore like to posit that computing's central challenge, viz. "How not to make a mess of it," has /not/ been met. - Edsger Dijkstra, 1930-2002
next reply other threads:[~2002-09-18 23:36 UTC|newest] Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top 2002-09-18 16:36 Phil Edwards [this message] -- strict thread matches above, loose matches on Subject: below -- 2002-10-02 19:57 pme 2002-09-18 9:16 nathan.holladay
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