Forgot to add this file

include/helpers.hpp

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+/*
+ * DISTRHO Cardinal Plugin
+ * Copyright (C) 2021 Filipe Coelho <falktx@falktx.com>
+ *
+ * This program 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 any later version.
+ *
+ * This program 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.
+ *
+ * For a full copy of the GNU General Public License see the LICENSE file.
+ */
+
+/**
+ * This file is an edited version of VCVRack's helpers.hpp
+ * Copyright (C) 2016-2021 VCV.
+ *
+ * This program 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.
+ */
+
+#pragma once
+
+#include <app/ModuleWidget.hpp>
+#include <engine/Module.hpp>
+
+#include <unordered_map>
+
+namespace rack {
+
+struct CardinalPluginModelHelper {
+    virtual ~CardinalPluginModelHelper() {}
+    virtual void createCachedModuleWidget(rack::engine::Module* m) = 0;
+    virtual void clearCachedModuleWidget(rack::engine::Module* m) = 0;
+};
+
+template <class TModule, class TModuleWidget>
+struct CardinalPluginModel : plugin::Model, CardinalPluginModelHelper
+{
+    std::unordered_map<rack::engine::Module*, app::ModuleWidget*> widgets;
+
+    rack::engine::Module* createModule() override
+    {
+        engine::Module* const m = new TModule;
+        m->model = this;
+        return m;
+    }
+
+    app::ModuleWidget* createModuleWidget(rack::engine::Module* const m) override
+    {
+        TModule* tm = NULL;
+        if (m) {
+            assert(m->model == this);
+            if (widgets.find(m) != widgets.end())
+                return widgets[m];
+            tm = dynamic_cast<TModule*>(m);
+        }
+        app::ModuleWidget* mw = new TModuleWidget(tm);
+        mw->setModel(this);
+        return mw;
+    }
+
+    void createCachedModuleWidget(rack::engine::Module* const m) override
+    {
+        assert(m != nullptr); if (m == nullptr) return;
+        assert(m->model == this); if (m->model != this) return;
+        TModule* const tm = dynamic_cast<TModule*>(m);
+        TModuleWidget* const mw = new TModuleWidget(tm);
+        mw->setModel(this);
+        widgets[m] = mw;
+    }
+
+    void clearCachedModuleWidget(rack::engine::Module* const m) override
+    {
+        assert(m != nullptr); if (m == nullptr) return;
+        assert(m->model == this); if (m->model != this) return;
+        widgets.erase(m);
+    }
+};
+
+template <class TModule, class TModuleWidget>
+CardinalPluginModel<TModule, TModuleWidget>* createModel(std::string slug)
+{
+	CardinalPluginModel<TModule, TModuleWidget>* const o = new CardinalPluginModel<TModule, TModuleWidget>();
+	o->slug = slug;
+	return o;
+}
+
+}
+
+#define createModel createModelOldVCV
+#include_next "helpers.hpp"