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src/util/enum_operators.h

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+/*
+ * Copyright © 2020 Red Hat Inc.
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a
+ * copy of this software and associated documentation files (the "Software"),
+ * to deal in the Software without restriction, including without limitation
+ * the rights to use, copy, modify, merge, publish, distribute, sublicense,
+ * and/or sell copies of the Software, and to permit persons to whom the
+ * Software is furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice (including the next
+ * paragraph) shall be included in all copies or substantial portions of the
+ * Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
+ * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+ * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
+ * IN THE SOFTWARE.
+ */
+
+#if defined(__cplusplus) && !defined(__OPENCL_VERSION__)
+
+#include "macros.h"
+#include <type_traits>
+
+// some enum helpers
+#define MESA_DEFINE_CPP_ENUM_BINARY_OPERATOR(Enum, op) \
+extern "C++" {                                         \
+UNUSED static constexpr                                \
+Enum operator op (Enum a, Enum b)                      \
+{                                                      \
+   using IntType = std::underlying_type_t<Enum>;       \
+   IntType ua = static_cast<IntType>(a);               \
+   IntType ub = static_cast<IntType>(b);               \
+   return static_cast<Enum>(ua op ub);                 \
+}                                                      \
+                                                       \
+UNUSED static constexpr                                \
+Enum& operator op##= (Enum &a, Enum b)                 \
+{                                                      \
+   using IntType = std::underlying_type_t<Enum>;       \
+   IntType ua = static_cast<IntType>(a);               \
+   IntType ub = static_cast<IntType>(b);               \
+   ua op##= ub;                                        \
+   a = static_cast<Enum>(ua);                          \
+   return a;                                           \
+}                                                      \
+}
+
+#define MESA_DEFINE_CPP_ENUM_UNARY_OPERATOR(Enum, op) \
+extern "C++" {                                        \
+UNUSED static constexpr                               \
+Enum operator op (Enum a)                             \
+{                                                     \
+   using IntType = std::underlying_type_t<Enum>;      \
+   IntType ua = static_cast<IntType>(a);              \
+   return static_cast<Enum>(op ua);                   \
+}                                                     \
+}
+
+#define MESA_DEFINE_CPP_ENUM_BITFIELD_OPERATORS(Enum) \
+MESA_DEFINE_CPP_ENUM_BINARY_OPERATOR(Enum, |)         \
+MESA_DEFINE_CPP_ENUM_BINARY_OPERATOR(Enum, &)         \
+MESA_DEFINE_CPP_ENUM_BINARY_OPERATOR(Enum, ^)         \
+MESA_DEFINE_CPP_ENUM_UNARY_OPERATOR(Enum, ~)
+
+#else
+
+#define MESA_DEFINE_CPP_ENUM_BITFIELD_OPERATORS(Enum)
+
+#endif