gdb -ex "thread apply all bt full" truncates C++ classes

When I run
gdb <executable-file> --core core --batch --quiet -ex "where" -ex
"thread apply all bt full" -ex "quit"

Things like C++ or STL classes(as function parameters) are
truncated(they show up as "...") in the backtrace.
Can gdb treat them like C structs and print the contents?

Version: gdb (Ubuntu/Linaro 7.4-2012.04-0ubuntu2.1) 7.4-2012.04

Many thanks in advance,
Reza.