From 3be2ae868746f2fc09f69e667e18b838cef82be9 Mon Sep 17 00:00:00 2001
From: Claudius Holeksa <mail@keldu.de>
Date: Fri, 19 May 2023 02:34:39 +0200
Subject: Initial commit with copying the unit lib

---
 src/kelunit/unit_print.h | 55 ++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 55 insertions(+)
 create mode 100644 src/kelunit/unit_print.h

(limited to 'src/kelunit/unit_print.h')

diff --git a/src/kelunit/unit_print.h b/src/kelunit/unit_print.h
new file mode 100644
index 0000000..0f3cb72
--- /dev/null
+++ b/src/kelunit/unit_print.h
@@ -0,0 +1,55 @@
+#include "./unit.h"
+
+#include <iostream>
+
+
+namespace std {
+template<typename UnitT, int64_t UnitE>
+inline ostream& operator<<(ostream& o, const kelun::unit_base<UnitT,UnitE>& ele){
+	o<<UnitT::short_name;
+	if constexpr ( UnitE != 1 ){
+		o<<'^'<<'('<<UnitE<<')';
+	}
+	return o;
+}
+}
+
+namespace kelun {
+template<typename... T>
+struct unit_print_impl {
+	static_assert(is_always_false<T...>, "Template type not supported");
+};
+
+template<typename UnitT, int64_t UnitE, typename... UnitTL, int64_t... UnitEL>
+struct unit_print_impl<unit_base<UnitT,UnitE>,unit_base<UnitTL,UnitEL>...> {
+	static std::ostream& print(std::ostream& o){
+		
+		unit_base<UnitT,UnitE> element;
+
+		std::ostream& o_ret = o << element;
+
+		if constexpr (sizeof...(UnitTL) > 0){
+			std::ostream& o_ret_next = o_ret << ' ' << '*' << ' ';
+			return unit_print_impl<unit_base<UnitTL,UnitEL>...>::print(o_ret_next);
+		}
+
+		return o_ret<<']';
+	}
+};
+}
+
+namespace std {
+
+template<typename StorageT, typename... T>
+inline ostream& operator<<(ostream& o, const kelun::unit<StorageT,T...>& unit);
+
+template<typename StorageT, typename... UnitT, int64_t... UnitE>
+inline ostream& operator<<(ostream& o, const kelun::unit<StorageT,kelun::unit_base<UnitT,UnitE>...>& unit){
+	o << unit.data();
+	if constexpr (sizeof...(UnitT) > 0) {
+		auto& o_ret = o << ' '<<'[';
+		return kelun::unit_print_impl<kelun::unit_base<UnitT,UnitE>...>::print(o_ret);
+	}
+	return o;
+}
+}
-- 
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