First graph class implementation and test

programs/Hadrons/Environment.hpp

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+/*
+ * Environment.hpp, part of Grid
+ *
+ * Copyright (C) 2015 Antonin Portelli
+ *
+ * Grid is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * Grid is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with Grid.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#ifndef Hadrons_Environment_hpp_
+#define Hadrons_Environment_hpp_
+
+#include <Hadrons/Global.hpp>
+#include <Hadrons/Graph.hpp>
+
+BEGIN_HADRONS_NAMESPACE
+
+/******************************************************************************
+ *                         Global environment                                 *
+ ******************************************************************************/
+// TODO: make it a singleton
+class Environment
+{
+public:
+    // constructor
+    Environment(void);
+    // destructor
+    virtual ~Environment(void) = default;
+};
+
+END_HADRONS_NAMESPACE
+
+#endif // Hadrons_Environment_hpp_