This commit merges in branches/arithmetic/internalbb up to revision 2831. This is a significant refactoring of code.

- r2820
-- Refactors Simplex so that it does significantly fewer functions.
--  Adds the LinearEqualityModule for handling update and pivotAndUpdate and other utility functions that require access to both the tableau and partial model.
-- Some of the code for propagation has moved to TheoryArith.
-r2826
-- Small changes to documentation and removes the no longer implemented deduceLowerBound() and deduceUpperBound().
- r2827
-- Adds isZero() to Rational. Adds cmp to DeltaRational.
- r2831
-- Refactored comparison to upper and lower in the partial model to use DeltaRational::cmp.
-- Refactored AssertUpper and AssertLower in TheoryArith to include functionality that has weaseled into TheoryArith::assertionCases.

1 files changed, 4 insertions, 0 deletions

diff --git a/src/util/rational_gmp_imp.h b/src/util/rational_gmp_imp.h
index 4635ce881..751c8f137 100644
--- a/src/util/rational_gmp_imp.h
+++ b/src/util/rational_gmp_imp.h
@@ -169,6 +169,10 @@ public:
     return mpq_sgn(d_value.get_mpq_t());
   }
 
+  bool isZero() const {
+    return sgn() == 0;
+  }
+
   Rational abs() const {
     if(sgn() < 0){
       return -(*this);