From 0d32f9b2c73690fa188d0f5920dfa9cbe3005200 Mon Sep 17 00:00:00 2001
From: "Claudius \"keldu\" Holeksa" <mail@keldu.de>
Date: Sun, 20 Apr 2025 17:12:55 +0200
Subject: Added Unit printing

---
 modules/codec-unit/c++/unit_print.hpp   | 54 +++++++++++++++++++++++++++++++++
 modules/codec-unit/tests/codec-unit.cpp |  6 ++++
 2 files changed, 60 insertions(+)
 create mode 100644 modules/codec-unit/c++/unit_print.hpp

diff --git a/modules/codec-unit/c++/unit_print.hpp b/modules/codec-unit/c++/unit_print.hpp
new file mode 100644
index 0000000..724e9d6
--- /dev/null
+++ b/modules/codec-unit/c++/unit_print.hpp
@@ -0,0 +1,54 @@
+#pragma once
+
+#include <iostream>
+
+namespace std {
+template<typename UT, int64_t UE>
+inline ostream& operator<<(ostream& o, const saw::schema::UnitElement<UT,UE>&){
+	o<<UT::short_name;
+	if constexpr (UE != 1){
+		o<<'^'<<'('<<UE<<')';
+	}
+	return o;
+}
+}
+
+namespace saw {
+namespace impl {
+template<typename... T>
+struct unit_print {
+	static_assert(always_false<T...>, "Template type not supported");
+};
+
+template<typename UT, int64_t UE, typename... UTL, int64_t... UEL>
+struct unit_print<schema::UnitElement<UT,UE>, schema::UnitElement<UTL,UEL>...> {
+	static std::ostream& print(std::ostream& o){
+		schema::UnitElement<UT,UE> element;
+
+		std::ostream& o_ret = o << element;
+
+		if constexpr (sizeof...(UTL) > 0) {
+			std::ostream& o_ret_next = o_ret << ' ' << '*' << ' ';
+			return unit_print<schema::UnitElement<UTL,UEL>...>::print(o_ret_next);
+		}
+
+		return o_ret<<']';
+	}
+};
+}
+}
+
+namespace std {
+template<typename Store, typename Encode, typename... T>
+inline ostream& operator<<(ostream& o, const saw::data<saw::schema::Unit<Store,T...>, Encode>& unit);
+
+template<typename StorageT, typename Encode, typename... UnitT, int64_t... UnitE>
+inline ostream& operator<<(ostream& o, const saw::data<saw::schema::Unit<StorageT,saw::schema::UnitElement<UnitT,UnitE>...>, Encode>& unit){
+	o << unit.handle().get();
+	if constexpr (sizeof...(UnitT) > 0) {
+		auto& o_ret = o << ' '<<'[';
+		return saw::impl::unit_print<saw::schema::UnitElement<UnitT,UnitE>...>::print(o_ret);
+	}
+	return o;
+}
+}
diff --git a/modules/codec-unit/tests/codec-unit.cpp b/modules/codec-unit/tests/codec-unit.cpp
index 99645bd..6ffc4fc 100644
--- a/modules/codec-unit/tests/codec-unit.cpp
+++ b/modules/codec-unit/tests/codec-unit.cpp
@@ -3,6 +3,7 @@
 #include <forstio/codec/schema.hpp>
 
 #include "../c++/unit.hpp"
+#include "../c++/unit_print.hpp"
 
 namespace {
 namespace sch {
@@ -60,4 +61,9 @@ SAW_TEST("Codec Unit/Division"){
 
 	SAW_EXPECT(c == data<sch::Scalar<sch::Int64>>{5u}, "Expected result 5");
 }
+
+SAW_TEST("Codec Unit/Print"){
+	using namespace saw;
+	// TODO
+}
 }
-- 
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