src/util/enum_operators.h

   1 /*
   2  * Copyright © 2020 Red Hat Inc.
   3  *
   4  * Permission is hereby granted, free of charge, to any person obtaining a
   5  * copy of this software and associated documentation files (the "Software"),
   6  * to deal in the Software without restriction, including without limitation
   7  * the rights to use, copy, modify, merge, publish, distribute, sublicense,
   8  * and/or sell copies of the Software, and to permit persons to whom the
   9  * Software is furnished to do so, subject to the following conditions:
  10  *
  11  * The above copyright notice and this permission notice (including the next
  12  * paragraph) shall be included in all copies or substantial portions of the
  13  * Software.
  14  *
  15  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  16  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  17  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
  18  * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  19  * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
  20  * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
  21  * IN THE SOFTWARE.
  22  */
  23
  24 #ifdef __cplusplus
  25
  26 // some enum helpers
  27 #define MESA_DEFINE_CPP_ENUM_BINARY_OPERATOR(Enum, op) \
  28 extern "C++" {                                         \
  29 static inline                                          \
  30 Enum operator op (Enum a, Enum b)                      \
  31 {                                                      \
  32    uint64_t ua = a, ub = b;                            \
  33    return static_cast<Enum>(ua op ub);                 \
  34 }                                                      \
  35                                                        \
  36 static inline                                          \
  37 Enum& operator op##= (Enum &a, Enum b)                 \
  38 {                                                      \
  39    uint64_t ua = a, ub = b;                            \
  40    ua op##= ub;                                        \
  41    a = static_cast<Enum>(ua);                          \
  42    return a;                                           \
  43 }                                                      \
  44 }
  45
  46 #define MESA_DEFINE_CPP_ENUM_UNARY_OPERATOR(Enum, op) \
  47 extern "C++" {                                        \
  48 static inline                                         \
  49 Enum operator op (Enum a)                             \
  50 {                                                     \
  51    uint64_t ua = a;                                   \
  52    return static_cast<Enum>(op ua);                   \
  53 }                                                     \
  54 }
  55
  56 #define MESA_DEFINE_CPP_ENUM_BITFIELD_OPERATORS(Enum) \
  57 MESA_DEFINE_CPP_ENUM_BINARY_OPERATOR(Enum, |)         \
  58 MESA_DEFINE_CPP_ENUM_BINARY_OPERATOR(Enum, &)         \
  59 MESA_DEFINE_CPP_ENUM_BINARY_OPERATOR(Enum, ^)         \
  60 MESA_DEFINE_CPP_ENUM_UNARY_OPERATOR(Enum, ~)
  61
  62 #else
  63
  64 #define MESA_DEFINE_CPP_ENUM_BITFIELD_OPERATORS(Enum)
  65
  66 #endif