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[ginac.git] / ginac / relational.cpp

diff --git a/ginac/relational.cpp b/ginac/relational.cpp
index 87acde42fe24b89e975167da4dd243716d411fe3..86e2c2e8399bde1fbea5eb4db966e69aa2870f27 100644 (file)
--- a/ginac/relational.cpp
+++ b/ginac/relational.cpp
@@ -164,7 +164,14 @@ ex relational::op(size_t i) const
 
 ex relational::map(map_function & f) const
 {
-       return (new relational(f(lh), f(rh), o))->setflag(status_flags::dynallocated);
+       const ex &mapped_lh = f(lh);
+       const ex &mapped_rh = f(rh);
+
+       if (!are_ex_trivially_equal(lh, mapped_lh)
+        || !are_ex_trivially_equal(rh, mapped_rh))
+               return (new relational(mapped_lh, mapped_rh, o))->setflag(status_flags::dynallocated);
+       else
+               return *this;
 }
 
 ex relational::eval(int level) const