diff -r 2bdc3ac5e77c -r 55a55a9ec2c2 src/model.h
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/src/model.h	Sun Sep 22 11:51:41 2019 +0300
@@ -0,0 +1,40 @@
+#pragma once
+#include <memory>
+#include "main.h"
+#include "header.h"
+#include "objecttypes/modelobject.h"
+
+class Model : public QObject
+{
+	Q_OBJECT
+public:
+	class EditContext;
+	Model();
+	Model(const Model &) = delete;
+	int size() const;
+	EditContext edit();
+private:
+	template<typename T, typename... Args>
+	T* append(Args&&... args);
+	template<typename T, typename... Args>
+	T* insert(int position, Args&&... args);
+	bool modified = false;
+	QString path;
+	using ModelObjectPointer = std::unique_ptr<modelobjects::BaseObject>;
+	LDHeader header;
+	std::vector<ModelObjectPointer> body;
+};
+
+template<typename T, typename... Args>
+T* Model::append(Args&&... args)
+{
+	this->body.push_back(std::make_unique<T>(args...));
+	return static_cast<T*>(this->body.back().get());
+}
+
+template<typename T, typename... Args>
+T* Model::insert(int position, Args&&... args)
+{
+	this->body.insert(position, std::make_unique<T>(args...));
+	return this->body[position];
+}