the attached preprocessed source does not compile with g++-4.2. it does compile with g++-4.0, 4.1 and 4.3, though, so i don't know whether there is any interest to work on a reduced test case and work on a bug fix ...
from my reading of the compiler error, it has to do with the compiler-generated copy constructor ... g++-4.2 -v: Using built-in specs. Target: i486-linux-gnu Configured with: ../src/configure -v --enable-languages=c,c++,fortran,objc,obj-c++ --prefix=/usr --enable-shared --with-system-zlib --libexecdir=/usr/lib --without-included-gettext --enable-threads=posix --enable-nls --with-gxx-include-dir=/usr/include/c++/4.2 --program-suffix=-4.2 --enable-clocale=gnu --enable-libstdcxx-debug --enable-objc-gc --enable-mpfr --enable-targets=all --enable-checking=release --build=i486-linux-gnu --host=i486-linux-gnu --target=i486-linux-gnu Thread model: posix gcc version 4.2.4 (Debian 4.2.4-2+b1) -- Summary: g++-4.2 rejects code, that other versions of gcc accept Product: gcc Version: 4.2.4 Status: UNCONFIRMED Severity: normal Priority: P3 Component: c++ AssignedTo: unassigned at gcc dot gnu dot org ReportedBy: tim at klingt dot org http://gcc.gnu.org/bugzilla/show_bug.cgi?id=36694