Merge pull request #1698 from ERGO-Code/fix-1697

Moved pdlp_iteration_count to last data member of HighsCallbackDataOut

FEATURES.md

@@ -1,13 +1,21 @@
+### Build changes
+
 ## HiGHS on nixpkgs
 
 HiGHS now has a `flake.nix` to build the binary, allowing `nix` users to try it out
 
-#### Python build update
+## Python build update
 
 Highspy with setuptools from v1.7.0 only worked on Python 3.12
 For v1.7.0 we have dropped setuptools and switched to scikit-build-core
 
-#### Windows versions
+## Windows versions
 
 Fixed version info of shared library
-Added version info to executable
+Added version info to executable
+
+### Code changes
+
+Inserting `pdlp_iteration_count` into various structs (for v1.7.0) breaks the C API, so it has been moved to the end of those structs
+
+

src/lp_data/HighsCallbackStruct.h

@@ -25,7 +25,6 @@ typedef struct {
   double running_time;
   HighsInt simplex_iteration_count;
   HighsInt ipm_iteration_count;
-  HighsInt pdlp_iteration_count;
   double objective_function_value;
   int64_t mip_node_count;
   double mip_primal_bound;
@@ -40,6 +39,7 @@ typedef struct {
   double* cutpool_value;
   double* cutpool_lower;
   double* cutpool_upper;
+  HighsInt pdlp_iteration_count;
 } HighsCallbackDataOut;
 
 typedef struct {