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39
40#include <QtCore/qglobal.h>
41
42#ifndef QFLAGS_H
43#define QFLAGS_H
44
45#include <initializer_list>
46
47QT_BEGIN_NAMESPACE
48
49class QDataStream;
50
51class QFlag
52{
53 int i;
54public:
55 Q_DECL_CONSTEXPR inline QFlag(int value) noexcept : i(value) {}
56 Q_DECL_CONSTEXPR inline operator int() const noexcept { return i; }
57
58#if !defined(Q_CC_MSVC)
59 // Microsoft Visual Studio has buggy behavior when it comes to
60 // unsigned enums: even if the enum is unsigned, the enum tags are
61 // always signed
62# if !defined(__LP64__) && !defined(Q_CLANG_QDOC)
63 Q_DECL_CONSTEXPR inline QFlag(long value) noexcept : i(int(value)) {}
64 Q_DECL_CONSTEXPR inline QFlag(ulong value) noexcept : i(int(long(value))) {}
65# endif
66 Q_DECL_CONSTEXPR inline QFlag(uint value) noexcept : i(int(value)) {}
67 Q_DECL_CONSTEXPR inline QFlag(short value) noexcept : i(int(value)) {}
68 Q_DECL_CONSTEXPR inline QFlag(ushort value) noexcept : i(int(uint(value))) {}
69 Q_DECL_CONSTEXPR inline operator uint() const noexcept { return uint(i); }
70#endif
71};
72Q_DECLARE_TYPEINFO(QFlag, Q_PRIMITIVE_TYPE);
73
74class QIncompatibleFlag
75{
76 int i;
77public:
78 Q_DECL_CONSTEXPR inline explicit QIncompatibleFlag(int i) noexcept;
79 Q_DECL_CONSTEXPR inline operator int() const noexcept { return i; }
80};
81Q_DECLARE_TYPEINFO(QIncompatibleFlag, Q_PRIMITIVE_TYPE);
82
83Q_DECL_CONSTEXPR inline QIncompatibleFlag::QIncompatibleFlag(int value) noexcept : i(value) {}
84
85
86#ifndef Q_NO_TYPESAFE_FLAGS
87
88template<typename Enum>
89class QFlags
90{
91 Q_STATIC_ASSERT_X((sizeof(Enum) <= sizeof(int)),
92 "QFlags uses an int as storage, so an enum with underlying "
93 "long long will overflow.");
94 Q_STATIC_ASSERT_X((std::is_enum<Enum>::value), "QFlags is only usable on enumeration types.");
95
96#if QT_DEPRECATED_SINCE(5,15)
97 struct Private;
98 typedef int (Private::*Zero);
99#endif
100 template <typename E> friend QDataStream &operator>>(QDataStream &, QFlags<E> &);
101 template <typename E> friend QDataStream &operator<<(QDataStream &, QFlags<E>);
102public:
103#if defined(Q_CC_MSVC) || defined(Q_CLANG_QDOC)
104 // see above for MSVC
105 // the definition below is too complex for qdoc
106 typedef int Int;
107#else
108 typedef typename std::conditional<
109 std::is_unsigned<typename std::underlying_type<Enum>::type>::value,
110 unsigned int,
111 signed int
112 >::type Int;
113#endif
114 typedef Enum enum_type;
115 // compiler-generated copy/move ctor/assignment operators are fine!
116#ifdef Q_CLANG_QDOC
117 Q_DECL_CONSTEXPR inline QFlags(const QFlags &other);
118 Q_DECL_CONSTEXPR inline QFlags &operator=(const QFlags &other);
119#endif
120 Q_DECL_CONSTEXPR inline QFlags() noexcept : i(0) {}
121 Q_DECL_CONSTEXPR inline QFlags(Enum flags) noexcept : i(Int(flags)) {}
122#if QT_DEPRECATED_SINCE(5,15)
123 QT_DEPRECATED_X("Use default constructor instead") Q_DECL_CONSTEXPR inline QFlags(Zero) noexcept : i(0) {}
124#endif
125 Q_DECL_CONSTEXPR inline QFlags(QFlag flag) noexcept : i(flag) {}
126
127 Q_DECL_CONSTEXPR inline QFlags(std::initializer_list<Enum> flags) noexcept
128 : i(initializer_list_helper(flags.begin(), flags.end())) {}
129
130 Q_DECL_RELAXED_CONSTEXPR inline QFlags &operator&=(int mask) noexcept { i &= mask; return *this; }
131 Q_DECL_RELAXED_CONSTEXPR inline QFlags &operator&=(uint mask) noexcept { i &= mask; return *this; }
132 Q_DECL_RELAXED_CONSTEXPR inline QFlags &operator&=(Enum mask) noexcept { i &= Int(mask); return *this; }
133 Q_DECL_RELAXED_CONSTEXPR inline QFlags &operator|=(QFlags other) noexcept { i |= other.i; return *this; }
134 Q_DECL_RELAXED_CONSTEXPR inline QFlags &operator|=(Enum other) noexcept { i |= Int(other); return *this; }
135 Q_DECL_RELAXED_CONSTEXPR inline QFlags &operator^=(QFlags other) noexcept { i ^= other.i; return *this; }
136 Q_DECL_RELAXED_CONSTEXPR inline QFlags &operator^=(Enum other) noexcept { i ^= Int(other); return *this; }
137
138 Q_DECL_CONSTEXPR inline operator Int() const noexcept { return i; }
139
140 Q_DECL_CONSTEXPR inline QFlags operator|(QFlags other) const noexcept { return QFlags(QFlag(i | other.i)); }
141 Q_DECL_CONSTEXPR inline QFlags operator|(Enum other) const noexcept { return QFlags(QFlag(i | Int(other))); }
142 Q_DECL_CONSTEXPR inline QFlags operator^(QFlags other) const noexcept { return QFlags(QFlag(i ^ other.i)); }
143 Q_DECL_CONSTEXPR inline QFlags operator^(Enum other) const noexcept { return QFlags(QFlag(i ^ Int(other))); }
144 Q_DECL_CONSTEXPR inline QFlags operator&(int mask) const noexcept { return QFlags(QFlag(i & mask)); }
145 Q_DECL_CONSTEXPR inline QFlags operator&(uint mask) const noexcept { return QFlags(QFlag(i & mask)); }
146 Q_DECL_CONSTEXPR inline QFlags operator&(Enum other) const noexcept { return QFlags(QFlag(i & Int(other))); }
147 Q_DECL_CONSTEXPR inline QFlags operator~() const noexcept { return QFlags(QFlag(~i)); }
148
149 Q_DECL_CONSTEXPR inline bool operator!() const noexcept { return !i; }
150
151 Q_DECL_CONSTEXPR inline bool testFlag(Enum flag) const noexcept { return (i & Int(flag)) == Int(flag) && (Int(flag) != 0 || i == Int(flag) ); }
152 Q_DECL_RELAXED_CONSTEXPR inline QFlags &setFlag(Enum flag, bool on = true) noexcept
153 {
154 return on ? (*this |= flag) : (*this &= ~Int(flag));
155 }
156
157private:
158 Q_DECL_CONSTEXPR static inline Int initializer_list_helper(typename std::initializer_list<Enum>::const_iterator it,
159 typename std::initializer_list<Enum>::const_iterator end)
160 noexcept
161 {
162 return (it == end ? Int(0) : (Int(*it) | initializer_list_helper(it + 1, end)));
163 }
164
165 Int i;
166};
167
168#ifndef Q_MOC_RUN
169#define Q_DECLARE_FLAGS(Flags, Enum)\
170typedef QFlags<Enum> Flags;
171#endif
172
173#define Q_DECLARE_INCOMPATIBLE_FLAGS(Flags) \
174Q_DECL_CONSTEXPR inline QIncompatibleFlag operator|(Flags::enum_type f1, int f2) noexcept \
175{ return QIncompatibleFlag(int(f1) | f2); }
176
177#define Q_DECLARE_OPERATORS_FOR_FLAGS(Flags) \
178Q_DECL_CONSTEXPR inline QFlags<Flags::enum_type> operator|(Flags::enum_type f1, Flags::enum_type f2) noexcept \
179{ return QFlags<Flags::enum_type>(f1) | f2; } \
180Q_DECL_CONSTEXPR inline QFlags<Flags::enum_type> operator|(Flags::enum_type f1, QFlags<Flags::enum_type> f2) noexcept \
181{ return f2 | f1; } Q_DECLARE_INCOMPATIBLE_FLAGS(Flags)
182
183
184#else /* Q_NO_TYPESAFE_FLAGS */
185
186#ifndef Q_MOC_RUN
187#define Q_DECLARE_FLAGS(Flags, Enum)\
188typedef uint Flags;
189#endif
190
191#define Q_DECLARE_OPERATORS_FOR_FLAGS(Flags)
192
193#endif /* Q_NO_TYPESAFE_FLAGS */
194
195QT_END_NAMESPACE
196
197#endif // QFLAGS_H
198

source code of qtbase/src/corelib/global/qflags.h