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
10 #include "SkTLogic.h"
11
12 namespace skstd {
13 template <typename T> struct is_bitmask_enum : std::false_type {};
14 }
15
16 template <typename E> SK_WHEN(skstd::is_bitmask_enum<E>::value, E) operator|(E l, E r) {
17 using U = skstd::underlying_type_t<E>;
18 return static_cast<E>(static_cast<U>(l) | static_cast<U>(r));
19 }
20
21 template <typename E> SK_WHEN(skstd::is_bitmask_enum<E>::value, E&) operator|=(E& l, E r) {
22 return l = l | r;
23 }
24
SK_WHEN(skstd::is_bitmask_enum<E>::value,E)25 template <typename E> SK_WHEN(skstd::is_bitmask_enum<E>::value, E) operator&(E l, E r) {
26 using U = skstd::underlying_type_t<E>;
27 return static_cast<E>(static_cast<U>(l) & static_cast<U>(r));
28 }
29
SK_WHEN(skstd::is_bitmask_enum<E>::value,E &)30 template <typename E> SK_WHEN(skstd::is_bitmask_enum<E>::value, E&) operator&=(E& l, E r) {
31 return l = l & r;
32 }
33
34 #endif // SkEnumOperators_DEFINED
35