Try to silence Visual Studio warning

Author: tautschnig

src/pointer-analysis/value_set_analysis.cpp

@@ -19,7 +19,8 @@ Author: Daniel Kroening, [email protected]
 #include <langapi/language_util.h>
 
 void value_sets_to_xml(
-  std::function<const value_sett &(goto_programt::const_targett)> get_value_set,
+  const std::function<const value_sett &(goto_programt::const_targett)>
+    &get_value_set,
   const goto_programt &goto_program,
   const irep_idt &identifier,
   xmlt &dest)

src/pointer-analysis/value_set_analysis.h

@@ -21,7 +21,8 @@ Author: Daniel Kroening, [email protected]
 class xmlt;
 
 void value_sets_to_xml(
-  std::function<const value_sett &(goto_programt::const_targett)> get_value_set,
+  const std::function<const value_sett &(goto_programt::const_targett)>
+    &get_value_set,
   const goto_programt &goto_program,
   const irep_idt &identifier,
   xmlt &dest);