Add an example class and some demo code to the project.

demo/example.gd

@@ -0,0 +1,6 @@
+extends Node
+
+
+func _ready() -> void:
+	var example := ExampleClass.new()
+	example.print_type(example)

demo/example.tscn

@@ -0,0 +1,6 @@
+[gd_scene load_steps=2 format=3 uid="uid://dh0oj81pufivs"]
+
+[ext_resource type="Script" path="res://example.gd" id="1_jdh55"]
+
+[node name="Node" type="Node"]
+script = ExtResource("1_jdh55")

doc_classes/ExampleClass.xml

@@ -0,0 +1,20 @@
+<?xml version="1.0" encoding="UTF-8" ?>
+<class name="ExampleClass" inherits="RefCounted" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:noNamespaceSchemaLocation="https://raw.githubusercontent.com/godotengine/godot/master/doc/class.xsd">
+	<brief_description>
+		Example class.
+	</brief_description>
+	<description>
+		An example class.
+	</description>
+	<tutorials>
+	</tutorials>
+	<methods>
+		<method name="print_type" qualifiers="const">
+			<return type="void" />
+			<param index="0" name="variant" type="Variant" />
+			<description>
+				Print the type of the variant.
+			</description>
+		</method>
+	</methods>
+</class>

src/example_class.cpp

@@ -0,0 +1,9 @@
+#include "example_class.h"
+
+void ExampleClass::_bind_methods() {
+	godot::ClassDB::bind_method(D_METHOD("print_type", "variant"), &ExampleClass::print_type);
+}
+
+void ExampleClass::print_type(const Variant &p_variant) const {
+	print_line(vformat("Type: %d", p_variant.get_type()));
+}

src/example_class.h

@@ -0,0 +1,20 @@
+#pragma once
+
+#include "godot_cpp/classes/ref_counted.hpp"
+#include "godot_cpp/classes/wrapped.hpp"
+#include "godot_cpp/variant/variant.hpp"
+
+using namespace godot;
+
+class ExampleClass : public RefCounted {
+	GDCLASS(ExampleClass, RefCounted)
+
+protected:
+	static void _bind_methods();
+
+public:
+	ExampleClass() = default;
+	~ExampleClass() override = default;
+
+	void print_type(const Variant &p_variant) const;
+};

src/register_types.cpp

@@ -1,9 +1,12 @@
 #include "register_types.h"
+
 #include <gdextension_interface.h>
 #include <godot_cpp/core/class_db.hpp>
 #include <godot_cpp/core/defs.hpp>
 #include <godot_cpp/godot.hpp>
 
+#include "example_class.h"
+
 using namespace godot;
 
 void initialize_gdextension_types(ModuleInitializationLevel p_level)
@@ -11,7 +14,7 @@ void initialize_gdextension_types(ModuleInitializationLevel p_level)
 	if (p_level != MODULE_INITIALIZATION_LEVEL_SCENE) {
 		return;
 	}
-	//GDREGISTER_CLASS(YourClass);
+	GDREGISTER_CLASS(ExampleClass);
 }
 
 void uninitialize_gdextension_types(ModuleInitializationLevel p_level) {