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 <type_traits>
11
12 namespace sknonstd {
13 template <typename T> struct is_bitmask_enum : std::false_type {};
14
15 template <typename E>
Any(E e)16 std::enable_if_t<sknonstd::is_bitmask_enum<E>::value, bool> constexpr Any(E e) {
17 return static_cast<std::underlying_type_t<E>>(e) != 0;
18 }
19 } // namespace sknonstd
20
21 template <typename E>
22 std::enable_if_t<sknonstd::is_bitmask_enum<E>::value, E> constexpr operator|(E l, E r) {
23 using U = std::underlying_type_t<E>;
24 return static_cast<E>(static_cast<U>(l) | static_cast<U>(r));
25 }
26
27 template <typename E>
28 std::enable_if_t<sknonstd::is_bitmask_enum<E>::value, E&> constexpr operator|=(E& l, E r) {
29 return l = l | r;
30 }
31
32 template <typename E>
33 std::enable_if_t<sknonstd::is_bitmask_enum<E>::value, E> constexpr operator&(E l, E r) {
34 using U = std::underlying_type_t<E>;
35 return static_cast<E>(static_cast<U>(l) & static_cast<U>(r));
36 }
37
38 template <typename E>
39 std::enable_if_t<sknonstd::is_bitmask_enum<E>::value, E&> constexpr operator&=(E& l, E r) {
40 return l = l & r;
41 }
42
43 template <typename E>
44 std::enable_if_t<sknonstd::is_bitmask_enum<E>::value, E> constexpr operator^(E l, E r) {
45 using U = std::underlying_type_t<E>;
46 return static_cast<E>(static_cast<U>(l) ^ static_cast<U>(r));
47 }
48
49 template <typename E>
50 std::enable_if_t<sknonstd::is_bitmask_enum<E>::value, E&> constexpr operator^=(E& l, E r) {
51 return l = l ^ r;
52 }
53
54 template <typename E>
55 std::enable_if_t<sknonstd::is_bitmask_enum<E>::value, E> constexpr operator~(E e) {
56 return static_cast<E>(~static_cast<std::underlying_type_t<E>>(e));
57 }
58
59 #endif // SkEnumOperators_DEFINED
60