Univariate Hensel lifting now uses upoly.

[ginac.git] / ginac / normal.h

diff --git a/ginac/normal.h b/ginac/normal.h
index 5f444278b36ef7142ed9428ed3a3cf34ed5e4787..5a735e346a8f485bfeaf1811ba329951b90c39c9 100644 (file)
--- a/ginac/normal.h
+++ b/ginac/normal.h
@@ -30,6 +30,28 @@
 
 namespace GiNaC {
 
+/**
+ * Flags to control the behaviour of gcd() and friends
+ */
+struct gcd_options
+{
+       enum {
+               /**
+                * Usually GiNaC tries heuristic GCD algorithm before PRS.
+                * Some people don't like this, so here's a flag to disable it.
+                */
+               no_heur_gcd = 2,
+               /**
+                * GiNaC tries to avoid expanding expressions when computing
+                * GCDs. This is a good idea, but some people dislike it.
+                * Hence the flag to disable special handling of partially
+                * factored polynomials. DON'T SET THIS unless you *really*
+                * know what are you doing!
+                */
+               no_part_factored = 4
+       };
+};
+
 class ex;
 class symbol;
 
@@ -52,7 +74,8 @@ extern ex sprem(const ex &a, const ex &b, const ex &x, bool check_args = true);
 extern bool divide(const ex &a, const ex &b, ex &q, bool check_args = true);
 
 // Polynomial GCD in Z[X], cofactors are returned in ca and cb, if desired
-extern ex gcd(const ex &a, const ex &b, ex *ca = NULL, ex *cb = NULL, bool check_args = true);
+extern ex gcd(const ex &a, const ex &b, ex *ca = NULL, ex *cb = NULL,
+             bool check_args = true, unsigned options = 0);
 
 // Polynomial LCM in Z[X]
 extern ex lcm(const ex &a, const ex &b, bool check_args = true);