From f0c5ac3c8222d4d89b8e2d2a726427a7ec64e538 Mon Sep 17 00:00:00 2001
From: Felix Morgner <felix.morgner@ost.ch>
Date: Wed, 10 Dec 2025 17:20:14 +0100
Subject: kstd: extract bitwise enum operations

---
 libs/kstd/CMakeLists.txt                 |  2 +
 libs/kstd/include/kstd/ext/bitfield_enum | 64 ++++++++++++++++++++++++++++++++
 2 files changed, 66 insertions(+)
 create mode 100644 libs/kstd/include/kstd/ext/bitfield_enum

(limited to 'libs')

diff --git a/libs/kstd/CMakeLists.txt b/libs/kstd/CMakeLists.txt
index e0c551c..d83e704 100644
--- a/libs/kstd/CMakeLists.txt
+++ b/libs/kstd/CMakeLists.txt
@@ -22,6 +22,8 @@ target_sources("kstd" PUBLIC
     "include/kstd/bits/shared_ptr.hpp"
     "include/kstd/bits/unique_ptr.hpp"
 
+    "include/kstd/ext/bitfield_enum"
+
     "include/kstd/asm_ptr"
     "include/kstd/memory"
     "include/kstd/mutex"
diff --git a/libs/kstd/include/kstd/ext/bitfield_enum b/libs/kstd/include/kstd/ext/bitfield_enum
new file mode 100644
index 0000000..327af45
--- /dev/null
+++ b/libs/kstd/include/kstd/ext/bitfield_enum
@@ -0,0 +1,64 @@
+#ifndef KSTD_EXT_BITFIELD_ENUM_HPP
+#define KSTD_EXT_BITFIELD_ENUM_HPP
+
+#include <bit>
+#include <type_traits>
+#include <utility>
+
+namespace kstd::ext
+{
+
+  template<typename EnumType>
+    requires std::is_enum_v<EnumType>
+  struct is_bitfield_enum : std::false_type
+  {
+  };
+
+  template<typename EnumType>
+  concept bitfield_enum = is_bitfield_enum<EnumType>::value;
+
+};  // namespace kstd::ext
+
+template<kstd::ext::bitfield_enum EnumType>
+constexpr auto operator|(EnumType lhs, EnumType rhs) -> EnumType
+{
+  return std::bit_cast<EnumType>(std::to_underlying(lhs) | std::to_underlying(rhs));
+}
+
+template<kstd::ext::bitfield_enum EnumType>
+constexpr auto operator|=(EnumType & lhs, EnumType rhs) -> EnumType &
+{
+  return lhs = lhs | rhs;
+}
+
+template<kstd::ext::bitfield_enum EnumType>
+constexpr auto operator&(EnumType lhs, EnumType rhs) -> EnumType
+{
+  return std::bit_cast<EnumType>(std::to_underlying(lhs) & std::to_underlying(rhs));
+}
+
+template<kstd::ext::bitfield_enum EnumType>
+constexpr auto operator&=(EnumType & lhs, EnumType rhs) -> EnumType &
+{
+  return lhs = lhs & rhs;
+}
+
+template<kstd::ext::bitfield_enum EnumType>
+constexpr auto operator^(EnumType lhs, EnumType rhs) -> EnumType
+{
+  return std::bit_cast<EnumType>(std::to_underlying(lhs) ^ std::to_underlying(rhs));
+}
+
+template<kstd::ext::bitfield_enum EnumType>
+constexpr auto operator^=(EnumType & lhs, EnumType rhs) -> EnumType &
+{
+  return lhs = lhs ^ rhs;
+}
+
+template<kstd::ext::bitfield_enum EnumType>
+constexpr auto operator~(EnumType lhs) -> EnumType
+{
+  return std::bit_cast<EnumType>(~std::to_underlying(lhs));
+}
+
+#endif
\ No newline at end of file
-- 
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