From b5cea86b468c3b62e0ff1b4e74b4976a10b40088 Mon Sep 17 00:00:00 2001
From: lisyarus <lisyarus@gmail.com>
Date: Mon, 29 May 2023 13:04:43 +0300
Subject: [PATCH] Add cyclic & dihedral group serialization

---
 libs/group/include/psemek/group/cyclic.hpp   | 19 +++++++++++++++++++
 libs/group/include/psemek/group/dihedral.hpp | 19 +++++++++++++++++++
 2 files changed, 38 insertions(+)

diff --git a/libs/group/include/psemek/group/cyclic.hpp b/libs/group/include/psemek/group/cyclic.hpp
index 29b2bce8..aad2a145 100644
--- a/libs/group/include/psemek/group/cyclic.hpp
+++ b/libs/group/include/psemek/group/cyclic.hpp
@@ -33,6 +33,11 @@ namespace psemek::group
 			return cyclic{value % static_cast<Repr>(N)};
 		}
 
+		static cyclic from_repr(Repr const & value)
+		{
+			return rotation(value);
+		}
+
 		template <typename T, typename = std::enable_if_t<std::is_integral_v<T>>>
 		static cyclic rotation(T const & value)
 		{
@@ -126,4 +131,18 @@ namespace psemek::group
 		return os;
 	}
 
+	template <typename OStream, std::size_t N, typename Repr>
+	void write(OStream & out, cyclic<N, Repr> const & g)
+	{
+		write(out, g.value());
+	}
+
+	template <typename IStream, std::size_t N, typename Repr>
+	void read(IStream & in, cyclic<N, Repr> & g)
+	{
+		Repr value;
+		read(in, value);
+		g = cyclic<N, Repr>::from_repr(value);
+	}
+
 }
diff --git a/libs/group/include/psemek/group/dihedral.hpp b/libs/group/include/psemek/group/dihedral.hpp
index 95e2e382..a1a5e364 100644
--- a/libs/group/include/psemek/group/dihedral.hpp
+++ b/libs/group/include/psemek/group/dihedral.hpp
@@ -67,6 +67,11 @@ namespace psemek::group
 			}
 		}
 
+		static dihedral from_repr(Repr const & repr)
+		{
+			return dihedral{repr % static_cast<Repr>(2 * N)};
+		}
+
 		Repr value() const
 		{
 			return repr_;
@@ -179,4 +184,18 @@ namespace psemek::group
 		return os;
 	}
 
+	template <typename OStream, std::size_t N, typename Repr>
+	void write(OStream & out, dihedral<N, Repr> const & g)
+	{
+		write(out, g.value());
+	}
+
+	template <typename IStream, std::size_t N, typename Repr>
+	void read(IStream & in, dihedral<N, Repr> & g)
+	{
+		Repr value;
+		read(in, value);
+		g = dihedral<N, Repr>::from_repr(value);
+	}
+
 }