Hi, folks! This program suprises me by causing a runtime assertion: ===== #include <string> #include using namespace boost::xpressive; int main() { std::string x("a\tb\tc"); sregex_token_iterator cur(x.begin(), x.end(), as_xpr("\t"), -1), end; for(; cur != end; ++cur) ; } ===== ...the assertion: ===== suprise: /usr/local/include/boost-1_35/boost/xpressive/detail/utility/tracking_ptr.hpp:196: void boost::xpressive::detail::enable_reference_tracking<Derived>::release() [with Derived = boost::xpressive::detail::regex_impl<__gnu_cxx::__normal_iterator > >]: Assertion `0 < this->cnt_' failed. Aborted ===== Changing the declarations like this causes it to work as I expect: ===== sregex tab_delim(as_xpr("\t")); sregex_token_iterator cur(x.begin(), x.end(), tab_delim, -1), end; ===== ...maybe there's some "temporary" magic happening, or that I was just plain doing something I shouldn't have been doing (silly me!), or both? Could anyone comment on what's happening? [Note: Boost 1.35, OpenSuSE 10.3, g++ 4.1.2] Thanks! _Jesse Williamson ;-};