From b6d33b8c299b47d877c89af675b15b318e33eb9f Mon Sep 17 00:00:00 2001
From: Andrey Astafyev <dev@246060.ru>
Date: Sat, 4 Apr 2020 01:20:48 +0300
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---
 src/myx/base/CMakeLists.txt              |  1 +
 src/myx/base/enum_bitmask_operations.hpp | 58 ++++++++++++++++++++++++
 2 files changed, 59 insertions(+)
 create mode 100644 src/myx/base/enum_bitmask_operations.hpp

diff --git a/src/myx/base/CMakeLists.txt b/src/myx/base/CMakeLists.txt
index 7e857f8..2fa7acd 100644
--- a/src/myx/base/CMakeLists.txt
+++ b/src/myx/base/CMakeLists.txt
@@ -9,6 +9,7 @@ set(current_target_sources
 set(current_target_headers
   ${CMAKE_CURRENT_SOURCE_DIR}/config.hpp
   ${CMAKE_CURRENT_SOURCE_DIR}/limits.hpp
+  ${CMAKE_CURRENT_SOURCE_DIR}/enum_bitmask_operations.hpp
 )
 
 add_common_library(TARGET ${current_target} OUTPUT_NAME myx-${current_target}
diff --git a/src/myx/base/enum_bitmask_operations.hpp b/src/myx/base/enum_bitmask_operations.hpp
new file mode 100644
index 0000000..a93094d
--- /dev/null
+++ b/src/myx/base/enum_bitmask_operations.hpp
@@ -0,0 +1,58 @@
+#ifndef MYX_BASE_ENUM_BITWISE_OPERATIONS_HPP_
+#define MYX_BASE_ENUM_BITWISE_OPERATIONS_HPP_
+
+
+#pragma once
+
+#include <type_traits>
+
+namespace myx {
+
+namespace base {
+
+template< typename Enum >
+struct EnableBitMaskOperators
+{
+	static const bool enable = false;
+};
+
+template< typename Enum >
+typename std::enable_if< EnableBitMaskOperators< Enum >::enable, Enum >::type
+operator |( Enum lhs, Enum rhs )
+{
+	using underlying = typename std::underlying_type< Enum >::type;
+	return( static_cast< Enum >(
+			static_cast< underlying >( lhs ) |
+			static_cast< underlying >( rhs )
+			) );
+}
+
+} // namespace base
+
+} // namespace myx
+
+/**
+ * @brief Макрос, предоставляющий возможность выполнять битовые операции в enum class
+ *
+ *  Источник: http://blog.bitwigglers.org/using-enum-classes-as-type-safe-bitmasks/
+ *  Пример использования:
+ *
+ *  namespace ns {
+ *  enum class Permissions
+ *  {
+ *     Readable   = 0x4,
+ *     Writeable  = 0x2,
+ *     Executable = 0x1
+ *  };
+ *  }
+ *  ENABLE_BITMASK_OPERATORS(ns::Permissions)
+ */
+
+#define ENABLE_BITMASK_OPERATORS( x ) \
+	template<> \
+	struct myx::base::EnableBitMaskOperators< x > \
+	{ \
+		static const bool enable = true; \
+	};
+
+#endif // ifndef MYX_BASE_ENUM_BITWISE_OPERATIONS_HPP_