specific utility file

corsika/framework/utility/HasMethodSignature.hpp

+#pragma once
+
+/*
+ * (c) Copyright 2018 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.
+ */
+
+/**
+ * @file HasMethodSignature.hpp
+ */
+
+#include <type_traits>
+
+namespace corsika {
+
+  namespace detail {
+
+    /**
+       Helper traits class (partial) for static compile time checking.
+
+       Note, this is a poor replacement for C++20 concepts... they are
+       eagerly awaited!
+
+       It defines the default body of a generic test function returning
+       std::false_type.
+
+       In addition it defines the pattern for class-method matching with a
+       return type TReturn and function arguments TArgs... . Right now
+       both method signatures, "const" and "not const", are matched.
+    */
+    template <typename TReturn, typename... TArgs>
+    struct has_method_signature {
+
+      // the non-const version
+      template <class T>
+      static std::true_type testSignature(TReturn (T::*)(TArgs...));
+
+      // the const version
+      template <class T>
+      static std::true_type testSignature(TReturn (T::*)(TArgs...) const);
+    };
+
+  } // namespace detail
+} // namespace corsika