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 "include/private/SkTLogic.h"
11
12 namespace skstd {
13 template <typename T> struct is_bitmask_enum : std::false_type {};
14
SK_WHEN(skstd::is_bitmask_enum<E>::value,bool)15 template <typename E> SK_WHEN(skstd::is_bitmask_enum<E>::value, bool) constexpr Any(E e) {
16 return static_cast<typename std::underlying_type<E>::type>(e) != 0;
17 }
18 }
19
20 template <typename E> SK_WHEN(skstd::is_bitmask_enum<E>::value, E) constexpr 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
25 template <typename E> SK_WHEN(skstd::is_bitmask_enum<E>::value, E&) constexpr operator|=(E& l, E r) {
26 return l = l | r;
27 }
28
SK_WHEN(skstd::is_bitmask_enum<E>::value,E)29 template <typename E> SK_WHEN(skstd::is_bitmask_enum<E>::value, E) constexpr operator&(E l, E r) {
30 using U = typename std::underlying_type<E>::type;
31 return static_cast<E>(static_cast<U>(l) & static_cast<U>(r));
32 }
33
SK_WHEN(skstd::is_bitmask_enum<E>::value,E &)34 template <typename E> SK_WHEN(skstd::is_bitmask_enum<E>::value, E&) constexpr operator&=(E& l, E r) {
35 return l = l & r;
36 }
37
38 template <typename E> SK_WHEN(skstd::is_bitmask_enum<E>::value, E) constexpr operator~(E e) {
39 return static_cast<E>(~static_cast<typename std::underlying_type<E>::type>(e));
40 }
41
42 #endif // SkEnumOperators_DEFINED
43