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From: Sylvain.Pion@mpi-sb.mpg.de To: gcc-gnats@gcc.gnu.org Cc: Sylvain.Pion@mpi-sb.mpg.de Subject: libstdc++/10783: std::vector::reverse_iterator could be smaller Date: Wed, 14 May 2003 15:46:00 -0000 [thread overview] Message-ID: <20030514153840.30740.qmail@sources.redhat.com> (raw) >Number: 10783 >Category: libstdc++ >Synopsis: std::vector::reverse_iterator could be smaller >Confidential: no >Severity: non-critical >Priority: medium >Responsible: unassigned >State: open >Class: pessimizes-code >Submitter-Id: net >Arrival-Date: Wed May 14 15:46:00 UTC 2003 >Closed-Date: >Last-Modified: >Originator: Sylvain Pion >Release: 3.2, 3.3, 3.4 (2.95 doesn't have the problem, I don't have 3.[01]) >Organization: >Environment: Reading specs from ./GCC/Linux-3.2/bin/../lib/gcc-lib/i686-pc-linux-gnu/3.2.3/specs Configured with: ../gcc-3.2/configure --prefix=/home/spion/GCC/Linux-3.2 --enable-languages=c++ Thread model: posix gcc version 3.2.3 >Description: On my 32bit machine, sizeof(std::vector<>::reverse_iterator) is 8. Similarly for std::vector<>::const_reverse_iterator. All other iterators from the STL containers (except deque) have sizeof 4. I believe it could be made also 4 bytes if the empty base class optimization applied, but it seems it doesn't. Is it because there are 2 derivations from the same iterator<...> class ? Is there a way to fix it ? >How-To-Repeat: #include <iostream> #include <vector> int main() { typedef std::vector<int> V; std::cout << "sizeof(iterator) = " << sizeof(V::iterator) << std::endl; std::cout << "sizeof(reverse_iterator) = " << sizeof(V::reverse_iterator) << std::endl; } >Fix: >Release-Note: >Audit-Trail: >Unformatted:
next reply other threads:[~2003-05-14 15:46 UTC|newest] Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top 2003-05-14 15:46 Sylvain.Pion [this message] 2003-05-18 18:48 paolo 2003-05-18 19:36 Paolo Carlini 2003-05-18 22:46 Nathan Myers
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