Program Listing for File tree_registry.h

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/********************************************************************************
 *                                                                              *
 * This file is part of IfcOpenShell.                                           *
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 * IfcOpenShell is free software: you can redistribute it and/or modify         *
 * it under the terms of the Lesser GNU General Public License as published by  *
 * the Free Software Foundation, either version 3.0 of the License, or          *
 * (at your option) any later version.                                          *
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 * IfcOpenShell 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                 *
 * Lesser GNU General Public License for more details.                          *
 *                                                                              *
 * You should have received a copy of the Lesser GNU General Public License     *
 * along with this program. If not, see <http://www.gnu.org/licenses/>.         *
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#ifndef IFCOPENSHELL_TREE_REGISTRY_H
#define IFCOPENSHELL_TREE_REGISTRY_H

#include "tree.h"
#include "../plugin/plugin.h"

#include <functional>
#include <map>
#include <memory>
#include <string>

namespace ifcopenshell {
    class file;

    namespace geom {
        class settings;

        namespace trees {

            struct IFC_GEOM_API tree_info {
                std::string backend_id;
            };

            class IFC_GEOM_API tree_registry {
            public:
                typedef std::function<tree*()> create_fn;

                void bind(const tree_info& info, create_fn create, const ifcopenshell::plugin::module& module = ifcopenshell::plugin::module());
                bool has(const std::string& backend_id) const;
                std::unique_ptr<tree> create(const std::string& backend_id) const;

            private:
                struct entry {
                    ifcopenshell::plugin::module module_;
                    tree_info info_;
                    create_fn create_;
                };

                std::map<std::string, entry> entries_;
            };

            IFC_GEOM_API tree_registry& tree_registry_instance();
            IFC_GEOM_API std::unique_ptr<tree> construct(const std::string& backend_id);

        }
    }
}

#endif