[GiNaC-devel] [SCM] GiNaC -- a C++ library for symbolic computations branch, master, updated. release_1-4-0-235-g3d09388

[Richard B. Kreckel]

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commit 3d09388a8ea144a19949c216fae43ccba92e47aa
Author: Alexei Sheplyakov <alexei.sheplyakov at gmail.com>
Date:   Tue Nov 23 17:45:52 2010 +0100

    [bugfix] chinrem_gcd: handle polynomials over rationals properly.
    
    * extract_integer_content():
      integer_content() can also return a rational number, e.g if the expression
      is a polynomial over rationals (in this case expr/content is polynomial
      over integers with integer content being 1). Therefore check if
      integer_content() is really an integer (and if it's not just return 1,
      GCD for polynomials over a field is defined up to arbitrary element of
      the field).
    
      This fixes possible segfault when computing GCD of polynomials over
      rationals (this is not theoretical, see the added test case).
    
    Thanks to Ernst Moritz Hahn for reporting this bug.

-----------------------------------------------------------------------

Summary of changes:
 check/bugme_chinrem_gcd.cpp |   18 ++++++++++++++++--
 ginac/polynomial/mgcd.cpp   |   10 ++++++++++
 2 files changed, 26 insertions(+), 2 deletions(-)


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GiNaC -- a C++ library for symbolic computations