Extract group state and create WGState to manage well & group state

opm/simulators/wells/WGState.hpp

@@ -0,0 +1,43 @@
+/*
+  Copyright 2021 Equinor ASA
+
+  This file is part of the Open Porous Media project (OPM).
+
+  OPM 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.
+
+  OPM 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 OPM.  If not, see <http://www.gnu.org/licenses/>.
+*/
+
+#ifndef OPM_WGSTATE_HEADER_INCLUDED
+#define OPM_WGSTATE_HEADER_INCLUDED
+
+#include <opm/simulators/wells/WellStateFullyImplicitBlackoil.hpp>
+#include <opm/simulators/wells/GroupState.hpp>
+
+namespace Opm {
+
+/*
+  Microscopic class to handle a pair of well and group state.
+*/
+
+class PhaseUsage;
+
+struct WGState {
+    WGState(const PhaseUsage& pu);
+
+    WellStateFullyImplicitBlackoil well_state;
+    GroupState group_state;
+};
+
+}
+
+#endif