diff --git a/examples/math_vector/main.cpp b/examples/math_vector/main.cpp
new file mode 100644
index 0000000..0cdd0e1
--- /dev/null
+++ b/examples/math_vector/main.cpp
@@ -0,0 +1,97 @@
+/* Copyright 2020-2022, Michele Santullo
+ * This file is part of wrenpp.
+ *
+ * Wrenpp 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.
+ *
+ * Wrenpp 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.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with wrenpp.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include "wrenpp/def_configuration.hpp"
+#include "wrenpp/vm_fun.hpp"
+#include "wrenpp/callback_manager.hpp"
+#include "wrenpp/class_manager.hpp"
+#include <string_view>
+#include <algorithm>
+#include <ctime>
+#include <memory>
+#include <vector>
+#include <cstring>
+#include <iostream>
+
+namespace {
+	constexpr std::string_view g_math_vector_src{
+"foreign class MathVector {" R"script(
+	construct new(value) {}
+	construct new(x, y, z) {}
+
+	foreign x
+	foreign y
+	foreign z
+}
+)script"};
+
+	constexpr const char g_test_script[] =
+R"script(import "math_vector" for MathVector
+var vec1 = MathVector.new(1.0)
+var vec2 = MathVector.new(10.0, 20.0, 30.0)
+System.print("vec1: <%(vec1.x), %(vec1.y), %(vec1.z)>")
+System.print("vec2: <%(vec2.x), %(vec2.y), %(vec2.z)>")
+)script";
+
+	class MathVector {
+	public:
+		MathVector() = default;
+		explicit MathVector (double value) :
+			m_x(value), m_y(value), m_z(value)
+		{}
+		MathVector (double x, double y, double z) :
+			m_x(x), m_y(y), m_z(z)
+		{}
+		~MathVector() noexcept = default;
+
+		double x() const { return m_x; }
+		double y() const { return m_y; }
+		double z() const { return m_z; }
+
+	private:
+		double m_x, m_y, m_z;
+	};
+
+	class MyConf : public wren::DefConfiguration {
+	public:
+		char* load_module_fn(wren::VM* vm, std::string_view module_name) {
+			if (module_name == "math_vector") {
+				constexpr const std::size_t buff_sz = g_math_vector_src.size();
+				char* const buff = static_cast<char*>(MyConf::reallocate_fn(nullptr, buff_sz));
+				std::copy(g_math_vector_src.cbegin(), g_math_vector_src.cend(), buff);
+				return buff;
+			}
+			return nullptr;
+		}
+	};
+} //unnamed namespace
+
+int main() {
+	using wren::make_method_bindable;
+
+	MyConf conf;
+	wren::VM vm(&conf, nullptr);
+	vm.callback_manager()
+		.add_callback(false, "math_vector", "MathVector", "x", make_method_bindable<&MathVector::x>())
+		.add_callback(false, "math_vector", "MathVector", "y", make_method_bindable<&MathVector::y>())
+		.add_callback(false, "math_vector", "MathVector", "z", make_method_bindable<&MathVector::z>());
+	vm.class_manager().add_class_maker("math_vector", "MathVector", &wren::make_overloaded_foreign_class<MathVector, double, std::tuple<double, double, double>>);
+
+	vm.interpret("main", g_test_script);
+
+	return 0;
+}
diff --git a/examples/math_vector/meson.build b/examples/math_vector/meson.build
new file mode 100644
index 0000000..a7e05b8
--- /dev/null
+++ b/examples/math_vector/meson.build
@@ -0,0 +1,6 @@
+executable('math_vector',
+  'main.cpp',
+  dependencies: wrenpp_dep,
+  install: false,
+)
+
diff --git a/examples/meson.build b/examples/meson.build
index 46175a9..25b06ea 100644
--- a/examples/meson.build
+++ b/examples/meson.build
@@ -1,3 +1,4 @@
 subdir('dieroll')
 subdir('greet')
 subdir('calendar')
+subdir('math_vector')
diff --git a/include/wrenpp/detail/construct_foreign_class.hpp b/include/wrenpp/detail/construct_foreign_class.hpp
index cffc504..3c547eb 100644
--- a/include/wrenpp/detail/construct_foreign_class.hpp
+++ b/include/wrenpp/detail/construct_foreign_class.hpp
@@ -25,7 +25,7 @@
 
 namespace wren {
 	namespace detail {
-		template <typename T, int... Indices, typename... Args>
+		template <typename T, typename... Args, int... Indices>
 		inline void construct_single (
 			std::integer_sequence<int, Indices...>,
 			VM& vm,
@@ -47,7 +47,7 @@ namespace wren {
 				//number of types we invoke construct_single() with those types.
 				constexpr int pack_size = static_cast<int>(sizeof...(PackArgs));
 				if (pack_size == cardinality) {
-					construct_single<T>(make_integer_sequence<int, pack_size>{}, vm, memory);
+					construct_single<T, PackArgs...>(make_integer_sequence<int, pack_size>{}, vm, memory);
 					return true;
 				}
 				else {
@@ -62,7 +62,7 @@ namespace wren {
 				using std::make_integer_sequence;
 
 				if (1 == cardinality) {
-					construct_single<T>(make_integer_sequence<int, 1>{}, vm, memory);
+					construct_single<T, LoneArg>(make_integer_sequence<int, 1>{}, vm, memory);
 					return true;
 				}
 				else {
diff --git a/include/wrenpp/meson.build b/include/wrenpp/meson.build
index d4b441d..5e2e6e3 100644
--- a/include/wrenpp/meson.build
+++ b/include/wrenpp/meson.build
@@ -1,16 +1,20 @@
 include_files = [
+  'callback_manager.hpp',
+  'class_manager.hpp',
   'configuration.hpp',
   'def_configuration.hpp',
-  'error_type.hpp',
-  'guess_class_name.hpp',
   'handle.hpp',
-  'has_method.hpp',
-  'meson.build',
-  'string_bt.hpp',
-  'StringCRC32.hpp',
   'vm_fun.hpp',
   'vm.hpp',
-  'wren_types.hpp',
+  'detail/construct_foreign_class.hpp',
+  'detail/error_type.hpp',
+  'detail/guess_class_name.hpp',
+  'detail/has_method.hpp',
+  'detail/seters_getters.hpp',
+  'detail/string_bt.hpp',
+  'detail/StringCRC32.hpp',
+  'detail/strings_in_vector.hpp',
+  'detail/wren_types.hpp',
 ]
 
 if not meson.is_subproject()