[STDCXX-127] std::deque::swap does not swap empty containers correctly

• Type: Bug
• Status: Closed
• Priority: Major
• Resolution: Fixed
• Affects Version/s: 4.1.3
• Fix Version/s: 4.2.0
• Component/s: 23. Containers

Environment

$ uname -a
Linux skynet 2.6.14.5 #3 SMP PREEMPT Mon Jan 9 13:59:21 MST 2006 i686 unknown unknown GNU/Linux

$ gcc -v
Using built-in specs.
Target: i686-pc-linux-gnu
Configured with: ../gcc-4.0.2/configure --prefix=/opt/compilers/gcc-4.0.2 --enable-shared --enable-threads --enable-languages=c,c++
Thread model: posix
gcc version 4.0.2

• Assignee: Farid Zaripov
• Reporter: Liviu Nicoara
• Created: 27/Jan/06 06:33
• Updated: 01/Nov/07 20:02
• Resolved: 15/Feb/07 14:41

Description

Copy and paste at prompt:

$ cat t.xpp
#include <cstddef>
#include <deque>

struct A

{ char tmp [32]; }

;

int main ()
{
A a [32];

std::deque<A> lhs (a, a + 0);
std::deque<A> rhs (a, a + 1);

lhs.swap (rhs);

return 0;
}

Building and running the example leads to a SIGSEGV:

$ make SRCS=t.cpp && ./t
gcc -c -I/build/nicoara/stdcxx/include/ansi -D_RWSTDDEBUG -pthread -D_RWSTD_USE_CONFIG -I/build/nicoara/15s-stdcxx/include -I/build/nicoara/stdcxx/include -I/build/nicoara/stdcxx/../rwtest -I/build/nicoara/stdcxx/../rwtest/include -I/build/nicoara/stdcxx/tests/include -pedantic -nostdinc++ -g -W -Wall -Wcast-qual -Winline -Wshadow -Wwrite-strings -Wno-long-long -Wcast-align /build/nicoara/stdcxx/tests/containers/t.cpp
gcc t.o -o t -L/build/nicoara/15s-stdcxx/rwtest -lrwtest15s -pthread -L/build/nicoara/15s-stdcxx/lib -lstd15s -lsupc++ -lm
Segmentation fault

Issue Links

• relates to: STDCXX-635 std::deque::swap invalidates begin() and end() iterators on empty container