X-Git-Url: https://www.ginac.de/ginac.git//ginac.git?a=blobdiff_plain;f=NEWS;h=dcf259c8acb0e0deae546dc200064601954a53e1;hb=bab935d3cbaccc2f1a77d16d712271063d085d42;hp=13d6253997974a5f15a19d5bc4a05c11255653ed;hpb=68fdf425abf14d016d5f95ee7b9d06a19a3c5926;p=ginac.git

diff --git a/NEWS b/NEWS
index 13d62539..dcf259c8 100644
--- a/NEWS
+++ b/NEWS
@@ -3,11 +3,15 @@ This file records noteworthy changes.
 1.2.0 (<insert date>)
 * Added a structure<T> template class for the easy creation of user-defined
   algebraic classes.
+* Improved the speed of subs() and normal() by the use of maps instead of
+  lists.
 * Many internal reorganizations and optimizations.
 * Caveats for class implementors:
    - basic::copy() and basic::destroy() are gone; classes derived from
      basic can use the defaults for the assignment operator and copy
      constructor.
+   - basic::subs() and basic::normal() take an 'exmap &' instead of two
+     'lst &'.
    - basic::subs() now descends into subexpressions (if accessible via
      nops()/op()/let_op()). If you have a custom implementation of subs()
      that calls basic::subs() after substituting subexpressions, this needs