Import Geant4 11.0.0.beta source tree

2021-06-25 16:12:29 +02:00
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+//
+// ********************************************************************
+// * License and Disclaimer                                           *
+// *                                                                  *
+// * The  Geant4 software  is  copyright of the Copyright Holders  of *
+// * the Geant4 Collaboration.  It is provided  under  the terms  and *
+// * conditions of the Geant4 Software License,  included in the file *
+// * LICENSE and available at  http://cern.ch/geant4/license .  These *
+// * include a list of copyright holders.                             *
+// *                                                                  *
+// * Neither the authors of this software system, nor their employing *
+// * institutes,nor the agencies providing financial support for this *
+// * work  make  any representation or  warranty, express or implied, *
+// * regarding  this  software system or assume any liability for its *
+// * use.  Please see the license in the file  LICENSE  and URL above *
+// * for the full disclaimer and the limitation of liability.         *
+// *                                                                  *
+// * This  code  implementation is the result of  the  scientific and *
+// * technical work of the GEANT4 collaboration.                      *
+// * By using,  copying,  modifying or  distributing the software (or *
+// * any work based  on the software)  you  agree  to acknowledge its *
+// * use  in  resulting  scientific  publications,  and indicate your *
+// * acceptance of all terms of the Geant4 Software license.          *
+// ********************************************************************
+#ifndef G4FILESYSTEM_HH
+#define G4FILESYSTEM_HH
+/**
+ * @namespace G4fs
+ * Namespace adapter for `filesystem` in `std::` or `std::experimental::`
+ *
+ * Developers should use this namespace to scope into the C++ filesystem
+ * library, e.g.
+ *
+ * ```cpp
+ * // Don't use std:: directly...
+ * auto p = std::filesystem::path{ argv[0] };
+ *
+ * // ... use the alias
+ * auto p = G4fs::path{ argv[0] };
+ * ```
+ *
+ * This allows compatibility with C++ standard libraries that only provide
+ * `filesystem` in the `std::experimental` namespace
+ *
+ */
+#if __has_include(<filesystem>)
+#  include <filesystem>
+namespace G4fs = std::filesystem;
+#elif __has_include(<experimental/filesystem>)
+#  include <experimental/filesystem>
+namespace G4fs = std::experimental::filesystem;
+#endif
+
+#endif /* G4FILESYSTEM_HH */