// utility functions
-/** Return the mul object handled by an ex. Deprecated: use ex_to<mul>().
- * This is unsafe: you need to check the type first. */
-inline const mul &ex_to_mul(const ex &e)
-{
- return static_cast<const mul &>(*e.bp);
-}
-
/** Specialization of is_exactly_a<mul>(obj) for mul objects. */
template<> inline bool is_exactly_a<mul>(const basic & obj)
{