start the feature [skpi ci]

Author: BDonnot

src/light_env/light_env.h

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+// Copyright (c) 2025, RTE (https://www.rte-france.com)
+// See AUTHORS.txt
+// This Source Code Form is subject to the terms of the Mozilla Public License, version 2.0.
+// If a copy of the Mozilla Public License, version 2.0 was not distributed with this file,
+// you can obtain one at http://mozilla.org/MPL/2.0/.
+// SPDX-License-Identifier: MPL-2.0
+// This file is part of LightSim2grid, LightSim2grid implements a c++ backend targeting the Grid2Op platform.
+
+#ifndef LIGHT_ENV_H
+#define LIGHT_ENV_H
+
+
+#endif // LIGHT_ENV_H

src/light_env/topo_action.h

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+// Copyright (c) 2025, RTE (https://www.rte-france.com)
+// See AUTHORS.txt
+// This Source Code Form is subject to the terms of the Mozilla Public License, version 2.0.
+// If a copy of the Mozilla Public License, version 2.0 was not distributed with this file,
+// you can obtain one at http://mozilla.org/MPL/2.0/.
+// SPDX-License-Identifier: MPL-2.0
+// This file is part of LightSim2grid, LightSim2grid implements a c++ backend targeting the Grid2Op platform.
+
+#ifndef TOPO_ACTION_H
+#define TOPO_ACTION_H
+
+#include <vector>
+#include "GridModel.h"
+
+class TopoAction
+{
+
+    public:
+        // TODO
+        TopoAction() {}
+
+        // TODO
+        void apply_to_gridmodel(GridModel & grid) const {
+
+        }
+
+        // TODO check compliance (correct sub, correct bus)
+        void check_validity(const GridModel & grid) const {
+
+        }
+        
+    protected:
+        int sub_id;
+
+        // bus id should be global (lightsim2grid / gridmodel) bus and
+        // not local bus id
+        std::vector<std::pair<int, int> > loads_bus;
+        std::vector<std::pair<int, int> > gens_bus;
+        std::vector<std::pair<int, int> > static_gens_bus;
+        std::vector<std::pair<int, int> > shunts_bus;
+        std::vector<std::pair<int, int> > lines_or_bus;
+        std::vector<std::pair<int, int> > lines_ex_bus;
+        std::vector<std::pair<int, int> > trafo_hv_bus;
+        std::vector<std::pair<int, int> > trafo_lv_bus;
+        std::vector<std::pair<int, int> > dc_lines_or_bus;
+        std::vector<std::pair<int, int> > dc_lines_ex_bus;
+        
+};
+
+#endif // TOPO_ACTION_H