From 6d0a8cec55069fc1561caab38cd540bd6403f1a5 Mon Sep 17 00:00:00 2001
From: lisyarus <lisyarus@gmail.com>
Date: Mon, 13 Jun 2022 01:01:13 +0300
Subject: [PATCH] Add macro helper for generating structs

---
 libs/util/include/psemek/util/struct.hpp | 45 ++++++++++++++++++++++++
 1 file changed, 45 insertions(+)
 create mode 100644 libs/util/include/psemek/util/struct.hpp

diff --git a/libs/util/include/psemek/util/struct.hpp b/libs/util/include/psemek/util/struct.hpp
new file mode 100644
index 00000000..e2de7c62
--- /dev/null
+++ b/libs/util/include/psemek/util/struct.hpp
@@ -0,0 +1,45 @@
+#pragma once
+
+#include <boost/preprocessor/seq/for_each.hpp>
+#include <boost/preprocessor/seq/for_each_i.hpp>
+#include <boost/preprocessor/tuple/elem.hpp>
+#include <boost/preprocessor/seq/variadic_seq_to_seq.hpp>
+#include <boost/preprocessor/stringize.hpp>
+
+#define psemek_declare_struct_detail_field(r, data, value) BOOST_PP_TUPLE_ELEM(0, value) BOOST_PP_TUPLE_ELEM(1, value);
+
+#define psemek_declare_struct_detail_for_each(r, data, value) f(x.BOOST_PP_TUPLE_ELEM(1, value) );
+
+#define psemek_declare_struct_detail_print(r, data, index, value) \
+	if (index > 0) s << ", "; \
+	s << BOOST_PP_STRINGIZE(BOOST_PP_TUPLE_ELEM(1, value)) << " = " << x.BOOST_PP_TUPLE_ELEM(1, value);
+
+#define psemek_declare_struct_impl(name, values) \
+	struct name { \
+		BOOST_PP_SEQ_FOR_EACH(psemek_declare_struct_detail_field, _, values) \
+	}; \
+	template <typename F> \
+	void for_each(name & x, F && f) { \
+		BOOST_PP_SEQ_FOR_EACH(psemek_declare_struct_detail_for_each, _, values) \
+	} \
+	template <typename F> \
+	void for_each(name const & x, F && f) { \
+		BOOST_PP_SEQ_FOR_EACH(psemek_declare_struct_detail_for_each, _, values) \
+	} \
+	template <typename Stream> \
+	Stream & operator << (Stream & s, name const & x) { \
+		s << '{'; \
+		BOOST_PP_SEQ_FOR_EACH_I(psemek_declare_struct_detail_print, _, values) \
+		s << '}'; \
+		return s; \
+	} \
+	template <typename Stream> \
+	void write(Stream & s, name const & x) { \
+		for_each(x, [&](auto const & v){ write(s, v); }); \
+	} \
+	template <typename Stream> \
+	void read(Stream & s, name & x) { \
+		for_each(x, [&](auto & v){ read(s, v); }); \
+	}
+
+#define psemek_declare_struct(name, values) psemek_declare_struct_impl(name, BOOST_PP_VARIADIC_SEQ_TO_SEQ(values))