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From: gandy@abacho.de To: gcc-gnats@gcc.gnu.org Subject: libstdc++/10794: std::map's erase method invalidates reverse_iterators Date: Wed, 14 May 2003 23:46:00 -0000 [thread overview] Message-ID: <20030514234516.28378.qmail@sources.redhat.com> (raw) >Number: 10794 >Category: libstdc++ >Synopsis: std::map's erase method invalidates reverse_iterators >Confidential: no >Severity: serious >Priority: medium >Responsible: unassigned >State: open >Class: sw-bug >Submitter-Id: net >Arrival-Date: Wed May 14 23:46:01 UTC 2003 >Closed-Date: >Last-Modified: >Originator: gandy@abacho.de >Release: libstdc++5-3.3 >Organization: >Environment: debian linux: ii libstdc++5 3.3-0pre9 ii libstdc++5-3.3-dev 3.3-0pre9 ii libstdc++5-3.3-doc 3.3-0pre9 ii libstdc++5-dev 3.2.3-2 ii g++ 3.2.3-1 ii g++-3.2 3.2.3-2 ii g++-3.3 3.3-0pre9 >Description: Programm output (g++-3.2 and g++-3.3): -90 270 -90 -90 Expected output: -90 -90 -90 -90 Note that the reverse_iterator jt is NOT pointing to the element which is erased. Citation from SGI STL Docu: Erasing an element from a map also does not invalidate any iterators, except, of course, for iterators that actually point to the element that is being erased. I would think that applies to reverse_iterators, too. >How-To-Repeat: #include <iostream> #include <map> using namespace std; int main() { map<double, double> byloc; map<double, double>::reverse_iterator jt; byloc.insert(pair<double, double>(90, 1)); byloc.insert(pair<double, double>(-90, 1)); byloc.insert(pair<double, double>(270, 1)); byloc.insert(pair<double, double>(-270, 1)); jt = byloc.rbegin(); jt++; jt++; cout << jt->first << endl; byloc.erase(90); cout << jt->first << endl; byloc.clear(); byloc.insert(pair<double, double>(90, 1)); byloc.insert(pair<double, double>(-90, 1)); byloc.insert(pair<double, double>(270, 1)); jt = byloc.rbegin(); jt++; jt++; cout << jt->first << endl; byloc.erase(90); cout << jt->first << endl; return 0; } >Fix: >Release-Note: >Audit-Trail: >Unformatted:
next reply other threads:[~2003-05-14 23:46 UTC|newest] Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top 2003-05-14 23:46 gandy [this message] 2003-05-15 16:01 paolo
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