From 91576eb2c5953b829cc863f15fa6af2ea05a9b1a Mon Sep 17 00:00:00 2001
From: ralfulrich <ralf.ulrich@kit.edu>
Date: Tue, 10 Nov 2020 10:10:19 +0100
Subject: [PATCH] added missing file
---
Environment/IEmpty.hpp | 45 ++++++++++++++++++++++++++++++++++++++++++
1 file changed, 45 insertions(+)
create mode 100644 Environment/IEmpty.hpp
diff --git a/Environment/IEmpty.hpp b/Environment/IEmpty.hpp
new file mode 100644
index 000000000..e4e65da2c
--- /dev/null
+++ b/Environment/IEmpty.hpp
@@ -0,0 +1,45 @@
+/*
+ * (c) Copyright 2020 CORSIKA Project, corsika-project@lists.kit.edu
+ *
+ * This software is distributed under the terms of the GNU General Public
+ * Licence version 3 (GPL Version 3). See file LICENSE for a full version of
+ * the license.
+ */
+
+#pragma once
+
+#include <corsika/units/PhysicalUnits.h>
+#include <corsika/geometry/Trajectory.h>
+
+namespace corsika::environment {
+
+ /**
+ * \class IEmpty
+ *
+ * intended for usage as default template argument for environments
+ * with no properties. For now, the ArclengthFromGrammage is
+ * mandatory, since it is used even in the most simple Cascade code.
+ *
+ * - IEmpty is the interface definition.
+ * - Empty<IEmpty> is a possible model implementation
+ *
+ **/
+
+ class IEmpty {
+ public:
+ virtual corsika::units::si::LengthType ArclengthFromGrammage(
+ corsika::geometry::LineTrajectory const&,
+ corsika::units::si::GrammageType) const = 0;
+ };
+
+ template <typename TModel = IEmpty>
+ class Empty : public TModel {
+ public:
+ corsika::units::si::LengthType ArclengthFromGrammage(
+ corsika::geometry::LineTrajectory const&,
+ corsika::units::si::GrammageType) const {
+ return 0. * corsika::units::si::meter;
+ }
+ };
+
+} // namespace corsika::environment
--
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