Replace boost::filesystem with std::filesystem in Herwig interface

Replace boost::filesystem with std::filesystem in Herwig interface

Generators/Herwig7_i/src/Herwig7.cxx

@@ -28,7 +28,7 @@
 #include "PathResolver/PathResolver.h"
 
 #include "boost/thread/thread.hpp"
-#include "boost/filesystem.hpp"
+#include <filesystem>
 #include "boost/algorithm/string.hpp"
 
 void   convert_to_HepMC(const ThePEG::Event & m_event, HepMC::GenEvent & evt, bool nocopies,ThePEG::Energy eunit, ThePEG::Length lunit);
@@ -261,16 +261,16 @@ StatusCode Herwig7::genFinalize() {
   ThePEG::Repository::cleanup();
 
   // possibly tidy up working directory
-  if (m_cleanup_herwig_scratch && (boost::filesystem::is_directory("Herwig-scratch") || boost::filesystem::is_directory("Herwig-cache"))){
+  if (m_cleanup_herwig_scratch && (std::filesystem::is_directory("Herwig-scratch") || std::filesystem::is_directory("Herwig-cache"))){
 
-    ATH_MSG_INFO("removing Herwig-scratch/Herwig-cache folder from "+boost::filesystem::current_path().string());
+    ATH_MSG_INFO("removing Herwig-scratch/Herwig-cache folder from "+std::filesystem::current_path().string());
 
     // sleep for some time to allow all access to terminate
     boost::this_thread::sleep(boost::posix_time::seconds(5)); /// \todo Think of other way to wait for all access to terminate
 
     // in case the folder can't be deleted continue with warning
     try {
-      (boost::filesystem::remove_all("Herwig-scratch") || boost::filesystem::remove_all("Herwig-cache"));
+      (std::filesystem::remove_all("Herwig-scratch") || std::filesystem::remove_all("Herwig-cache"));
     } 
     catch (const std::exception& e) {
       ATH_MSG_WARNING("Failed to delete the folder 'Herwig-scratch': "+std::string(e.what()));