X-Git-Url: https://www.ginac.de/ginac.git//ginac.git?p=ginac.git;a=blobdiff_plain;f=ginac%2Fpseries.h;h=26c27306250a03a03177764962efc32734349cfc;hp=72586eaf96648cdff54627260afc8a1cc08c766d;hb=dbd9c306a74f1cb258c0d15a346b973b39deaad2;hpb=b9cd4b49ffbfbf3e1c36a2b594ec3148a5baca64;ds=sidebyside

diff --git a/ginac/pseries.h b/ginac/pseries.h
index 72586eaf..26c27306 100644
--- a/ginac/pseries.h
+++ b/ginac/pseries.h
@@ -3,7 +3,7 @@
  *  Interface to class for extended truncated power series. */
 
 /*
- *  GiNaC Copyright (C) 1999-2001 Johannes Gutenberg University Mainz, Germany
+ *  GiNaC Copyright (C) 1999-2003 Johannes Gutenberg University Mainz, Germany
  *
  *  This program is free software; you can redistribute it and/or modify
  *  it under the terms of the GNU General Public License as published by
@@ -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)