Add ldexp to HighsCDouble

Author: Opt-Mucca

highs/mip/HighsCutGeneration.cpp

@@ -726,7 +726,7 @@ double HighsCutGeneration::scale(double val) {
   expshift = std::min(10, expshift);
 
   // Scale rhs
-  rhs = std::ldexp(static_cast<double>(rhs), expshift);
+  rhs = ldexp(rhs, expshift);
 
   // Scale row
   for (HighsInt i = 0; i != rowlen; ++i)

highs/util/HighsCDouble.h

@@ -314,6 +314,10 @@ class HighsCDouble {
   }
 
   friend HighsCDouble round(const HighsCDouble& x) { return floor(x + 0.5); }
+
+  friend HighsCDouble ldexp(const HighsCDouble& v, int exp) {
+    return HighsCDouble(std::ldexp(v.hi, exp), std::ldexp(v.lo, exp));
+  }
 };
 
 #endif