fixed a bug where quo() would call vector::reserve() with a negative argument

[ginac.git] / ginac / pseries.h

diff --git a/ginac/pseries.h b/ginac/pseries.h
index 72586eaf96648cdff54627260afc8a1cc08c766d..2ab9bfc9895286842ac3209fea141091a5ce96c4 100644 (file)
--- a/ginac/pseries.h
+++ b/ginac/pseries.h
@@ -101,16 +101,13 @@ protected:
        ex point;
 };
 
-/** Return a reference to the pseries object embedded in an expression.
- *  The result is undefined if the expression does not contain a pseries
- *  object at its top level.
- *
- *  @param e expression
- *  @return reference to pseries object
- *  @see is_ex_of_type */
-inline const pseries &ex_to_pseries(const ex &e)
+
+// utility functions
+
+/** Specialization of is_exactly_a<pseries>(obj) for pseries objects. */
+template<> inline bool is_exactly_a<pseries>(const basic & obj)
 {
-       return static_cast<const pseries &>(*e.bp);
+       return obj.tinfo()==TINFO_pseries;
 }
 
 /** Convert the pseries object embedded in an expression to an ordinary
@@ -119,11 +116,11 @@ inline const pseries &ex_to_pseries(const ex &e)
  *
  *  @param e expression
  *  @return polynomial expression
- *  @see is_ex_of_type
+ *  @see is_a<>
  *  @see pseries::convert_to_poly */
 inline ex series_to_poly(const ex &e)
 {
-       return (static_cast<const pseries &>(*e.bp).convert_to_poly(true));
+       return (ex_to<pseries>(e).convert_to_poly(true));
 }
 
 inline bool is_terminating(const pseries & s)