From cdead12dc46cd46928eb3577a9bd1f35de57e6dd Mon Sep 17 00:00:00 2001
From: John Forrest <jjhforrest@gmail.com>
Date: Fri, 29 Mar 2024 09:45:22 +0000
Subject: [PATCH] allow better duals on max iterations

---
 src/ClpModel.hpp                     | 1 +
 src/ClpSimplexDual.cpp               | 2 ++
 src/OsiClp/OsiClpSolverInterface.cpp | 8 ++++----
 3 files changed, 7 insertions(+), 4 deletions(-)

diff --git a/src/ClpModel.hpp b/src/ClpModel.hpp
index 5d7a977a..6115e18e 100644
--- a/src/ClpModel.hpp
+++ b/src/ClpModel.hpp
@@ -1195,6 +1195,7 @@ class CLPLIB_EXPORT ClpModel {
          0x01000000 is Cbc (and in branch and bound)
          0x02000000 is in a different branch and bound
 	 0x04000000 - zero costs!
+	 0x08000000 - get correct duals  on max iterations
      */
   inline unsigned int specialOptions() const
   {
diff --git a/src/ClpSimplexDual.cpp b/src/ClpSimplexDual.cpp
index 1d6838d3..cd97a9bf 100644
--- a/src/ClpSimplexDual.cpp
+++ b/src/ClpSimplexDual.cpp
@@ -1847,6 +1847,8 @@ int ClpSimplexDual::whileIterating(double *&givenDuals, int ifValuesPass)
         } else if (whatNext == 2) {
           // maximum iterations or equivalent
           problemStatus_ = 3;
+	  if ((specialOptions_&0x08000000)!=0)
+	    gutsOfSolution(NULL,NULL); // clean up
           returnCode = 3;
           break;
         }
diff --git a/src/OsiClp/OsiClpSolverInterface.cpp b/src/OsiClp/OsiClpSolverInterface.cpp
index 5f8b0005..e10124e5 100644
--- a/src/OsiClp/OsiClpSolverInterface.cpp
+++ b/src/OsiClp/OsiClpSolverInterface.cpp
@@ -1638,16 +1638,16 @@ void OsiClpSolverInterface::setupForRepeatedUse(int senseOfAdventure, int printO
   // First try
   switch (senseOfAdventure) {
   case 0:
-    specialOptions_ = 8;
+    specialOptions_ |= 8;
     break;
   case 1:
-    specialOptions_ = 1 + 2 + 8;
+    specialOptions_ |= 1 + 2 + 8;
     break;
   case 2:
-    specialOptions_ = 1 + 2 + 4 + 8;
+    specialOptions_ |= 1 + 2 + 4 + 8;
     break;
   case 3:
-    specialOptions_ = 1 + 8;
+    specialOptions_ |= 1 + 8;
     break;
   }
   //#define NO_CRUNCH2