[Bug c++/24274] New: reverse_iterator problems with g++ 3.4.2

[shawn dot yarbrough at gmail dot com]

Under MinGW with gcc 3.4.2 I'm having reverse_iterator problems with std::list.

My first example below fails to compile, and my second example compiles but
runs incorrectly.  I was going to attach the .ii files but bugzilla doesn't
seem to  allow attachments and the .ii files are rather large.

So here as text are the very short .cpp files which include only standard
headers.


$ type g++
g++ is hashed (/mingw/bin/g++)

$ g++ -v
Reading specs from c:/devel/mingw/bin/../lib/gcc/mingw32/3.4.2/specs
Configured with: ../gcc/configure --with-gcc --with-gnu-ld --with-gnu-as
--host=mingw32 --target=mingw32 --prefix=/mingw --enable-threads --disable-nls
--enable-languages=c,c++,f77,ada,objc,java --disable-win32-registry
--disable-shared --enable-sjlj-exceptions --enable-libgcj --disable-java-awt
--without-x --enable-java-gc=boehm --disable-libgcj-debug --enable-interpreter
--enable-hash-synchronization --enable-libstdcxx-debug
Thread model: win32
gcc version 3.4.2 (mingw-special)

$ g++ -save-temps testrit1.cpp -otestrit1
testrit1.cpp: In function `int main(int, char**)':
testrit1.cpp:39: error: no match for 'operator!=' in 'creverse !=
std::list<_Tp, _Alloc>::rend() [with _Tp = int, _Alloc =
std::allocator<int>]()'

$ g++ -save-temps testrit2.cpp -otestrit2

$ testrit2
7
8
IMPOSSIBLE



//////////// testrit1.cpp


#include <iostream>
#include <list>
using namespace std;


int
main( int argc, char *argv[] )
{
    list<int> mylist;
    mylist.push_back(1);
    mylist.push_back(2);
    mylist.push_back(3);
    mylist.push_back(4);

    list<int>::iterator               forward;
    list<int>::reverse_iterator       reverse;
    list<int>::const_iterator         cforward;
    list<int>::const_reverse_iterator creverse;

    // forward
    for( forward = mylist.begin(); forward != mylist.end(); ++forward )
        cout << *forward << endl;
    cout << endl;

    // reverse
    for( reverse = mylist.rbegin(); reverse != mylist.rend(); ++reverse )
        cout << *reverse << endl;
    cout << endl;

    // cforward
    for( cforward = mylist.begin(); cforward != mylist.end(); ++cforward )
        cout << *cforward << endl;
    cout << endl;

    // creverse
    for( creverse = mylist.rbegin(); creverse != mylist.rend(); ++creverse )
        cout << *creverse << endl;
    cout << endl;

    return 0;
}



//////////// testrit2.cpp


#include <iostream>
#include <list>
using namespace std;


int
main( int argc, char *argv[] )
{
    list<int> mylist;
    mylist.push_back(1);
    mylist.push_back(2);
    mylist.push_back(3);
    mylist.push_back(4);
    mylist.push_back(5);
    mylist.push_back(6);
    mylist.push_back(7);
    mylist.push_back(8);
    mylist.push_back(9);

    list<int>::iterator               forward;
    list<int>::reverse_iterator       reverse;

    reverse = mylist.rbegin();
    ++reverse;
    ++reverse;

    cout << *reverse << endl;
    forward = reverse.base();
    cout << *forward << endl;

    if( *forward != *reverse ) cout << "IMPOSSIBLE" << std::endl;

    return 0;
}


-- 
           Summary: reverse_iterator problems with g++ 3.4.2
           Product: gcc
           Version: 3.4.2
            Status: UNCONFIRMED
          Severity: major
          Priority: P2
         Component: c++
        AssignedTo: unassigned at gcc dot gnu dot org
        ReportedBy: shawn dot yarbrough at gmail dot com


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=24274