comparison: src/generics/enums.h
src/generics/enums.h
- changeset 1319
- 39d7a9642eea
- child 1326
- 69a90bd2dba2
equal
deleted
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| 1318:568fcfc6da71 | 1319:39d7a9642eea |
|---|---|
| 1 #pragma once | |
| 2 #include <type_traits> | |
| 3 | |
| 4 template<typename T> | |
| 5 struct EnumLimits {}; | |
| 6 | |
| 7 // | |
| 8 // Iterates an enum | |
| 9 // | |
| 10 template<typename Enum> | |
| 11 struct EnumIterShell | |
| 12 { | |
| 13 struct Iterator | |
| 14 { | |
| 15 Iterator(typename std::underlying_type<Enum>::type i) : | |
| 16 i(i) {} | |
| 17 | |
| 18 Iterator& operator++() { ++i; return *this; } | |
| 19 bool operator==(Iterator other) { return i == other.i; } | |
| 20 bool operator!=(Iterator other) { return i != other.i; } | |
| 21 Enum operator*() const { return Enum(i); } | |
| 22 | |
| 23 typename std::underlying_type<Enum>::type i; | |
| 24 }; | |
| 25 | |
| 26 Iterator begin() | |
| 27 { | |
| 28 return Iterator(EnumLimits<Enum>::First); | |
| 29 }; | |
| 30 | |
| 31 Iterator end() | |
| 32 { | |
| 33 return Iterator(EnumLimits<Enum>::Last + 1); | |
| 34 } | |
| 35 }; | |
| 36 | |
| 37 template<typename Enum> | |
| 38 EnumIterShell<Enum> iterateEnum() | |
| 39 { | |
| 40 return EnumIterShell<Enum>(); | |
| 41 } | |
| 42 | |
| 43 /* | |
| 44 * Casts an enum into its underlying type. | |
| 45 */ | |
| 46 template<typename T> | |
| 47 typename std::underlying_type<T>::type& enum_cast(T& enu) | |
| 48 { | |
| 49 return *reinterpret_cast<typename std::underlying_type<T>::type*>(&enu); | |
| 50 } | |
| 51 | |
| 52 /* | |
| 53 * Returns whether an enum value is within proper bounds. | |
| 54 */ | |
| 55 template<typename Enum> | |
| 56 bool valueInEnum(Enum enumerator) | |
| 57 { | |
| 58 auto index = enum_cast(enumerator); | |
| 59 return index >= EnumLimits<Enum>::First and index <= EnumLimits<Enum>::Last; | |
| 60 } | |
| 61 | |
| 62 #define MAKE_ITERABLE_ENUM(T) \ | |
| 63 template<> \ | |
| 64 struct EnumLimits<T> \ | |
| 65 {\ | |
| 66 enum { First = 0, Last = static_cast<int>(T::_End) - 1, Count = Last + 1 };\ | |
| 67 }; \ | |
| 68 inline T operator++ (T& a) { a = static_cast<T>(enum_cast(a) + 1); return a; } \ | |
| 69 inline T operator-- (T& a) { a = static_cast<T>(enum_cast(a) - 1); return a; } \ | |
| 70 inline T operator++ (T& a, int) { T result = a; a = static_cast<T>(enum_cast(a) + 1); return result; } \ | |
| 71 inline T operator-- (T& a, int) { T result = a; a = static_cast<T>(enum_cast(a) - 1); return result; } |
