SkBitmaskEnum.h 1.0 KB

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  1. /*
  2. * Copyright 2016 Google Inc.
  3. *
  4. * Use of this source code is governed by a BSD-style license that can be
  5. * found in the LICENSE file.
  6. */
  7. #ifndef SkEnumOperators_DEFINED
  8. #define SkEnumOperators_DEFINED
  9. #include "include/private/SkTLogic.h"
  10. namespace skstd {
  11. template <typename T> struct is_bitmask_enum : std::false_type {};
  12. }
  13. template <typename E> SK_WHEN(skstd::is_bitmask_enum<E>::value, E) operator|(E l, E r) {
  14. using U = typename std::underlying_type<E>::type;
  15. return static_cast<E>(static_cast<U>(l) | static_cast<U>(r));
  16. }
  17. template <typename E> SK_WHEN(skstd::is_bitmask_enum<E>::value, E&) operator|=(E& l, E r) {
  18. return l = l | r;
  19. }
  20. template <typename E> SK_WHEN(skstd::is_bitmask_enum<E>::value, E) operator&(E l, E r) {
  21. using U = typename std::underlying_type<E>::type;
  22. return static_cast<E>(static_cast<U>(l) & static_cast<U>(r));
  23. }
  24. template <typename E> SK_WHEN(skstd::is_bitmask_enum<E>::value, E&) operator&=(E& l, E r) {
  25. return l = l & r;
  26. }
  27. #endif // SkEnumOperators_DEFINED