Merge pull request #1556 from diffblue/revert-1554-janmroczkowski/more-static-member-functions-in-unified_difft

Revert "Make more member function static in unified_difft"

Author: Daniel Kroening

src/goto-diff/unified_diff.cpp

@@ -54,7 +54,7 @@ unified_difft::get_diff(const irep_idt &function) const
 unified_difft::goto_program_difft unified_difft::get_diff(
   const goto_programt &old_goto_program,
   const goto_programt &new_goto_program,
-  const differencest &differences)
+  const differencest &differences) const
 {
   goto_programt::instructionst::const_iterator old_it =
     old_goto_program.instructions.begin();
@@ -148,7 +148,7 @@ void unified_difft::lcss(
   const irep_idt &identifier,
   const goto_programt &old_goto_program,
   const goto_programt &new_goto_program,
-  differencest &differences)
+  differencest &differences) const
 {
   std::size_t old_count = old_goto_program.instructions.size();
   std::size_t new_count = new_goto_program.instructions.size();

src/goto-diff/unified_diff.h

@@ -61,16 +61,16 @@ class unified_difft
     const goto_programt &old_goto_program,
     const goto_programt &new_goto_program);
 
-  static void lcss(
+  void lcss(
     const irep_idt &identifier,
     const goto_programt &old_goto_program,
     const goto_programt &new_goto_program,
-    differencest &differences);
+    differencest &differences) const;
 
-  static goto_program_difft get_diff(
+  goto_program_difft get_diff(
     const goto_programt &old_goto_program,
     const goto_programt &new_goto_program,
-    const differencest &differences);
+    const differencest &differences) const;
 
   void output_diff(
     const irep_idt &identifier,