/****************************************************************************
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** Copyright (C) 2013 Digia Plc and/or its subsidiary(-ies).
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** This file is part of the QtCore module of the Qt Toolkit.
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** packaging of this file.  Please review the following information to
** ensure the GNU Lesser General Public License version 2.1 requirements
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** Alternatively, this file may be used under the terms of the GNU
** General Public License version 3.0 as published by the Free Software
** Foundation and appearing in the file LICENSE.GPL included in the
** packaging of this file.  Please review the following information to
** ensure the GNU General Public License version 3.0 requirements will be
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****************************************************************************/

#include <QtCore/qglobal.h>

#ifndef QFLAGS_H
#define QFLAGS_H

#include <QtCore/qtypeinfo.h>
#include <QtCore/qtypetraits.h>

QT_BEGIN_NAMESPACE

class QFlag
{
    int i;
public:
    Q_DECL_CONSTEXPR inline QFlag(int i);
    Q_DECL_CONSTEXPR inline operator int() const { return i; }
};
Q_DECLARE_TYPEINFO(QFlag, Q_PRIMITIVE_TYPE);

Q_DECL_CONSTEXPR inline QFlag::QFlag(int ai) : i(ai) {}

class QIncompatibleFlag
{
    int i;
public:
    Q_DECL_CONSTEXPR inline explicit QIncompatibleFlag(int i);
    Q_DECL_CONSTEXPR inline operator int() const { return i; }
};
Q_DECLARE_TYPEINFO(QIncompatibleFlag, Q_PRIMITIVE_TYPE);

Q_DECL_CONSTEXPR inline QIncompatibleFlag::QIncompatibleFlag(int ai) : i(ai) {}


#ifndef Q_NO_TYPESAFE_FLAGS

template<typename Enum>
class QFlags
{
    Q_STATIC_ASSERT_X((sizeof(Enum) <= sizeof(int)),
                      "QFlags uses an int as storage, so an enum with underlying "
                      "long long would overflow. Qt 5.1 will have support for 64bit enums.");
    struct Private;
    typedef int (Private::*Zero);
public:
#ifndef Q_QDOC
    typedef typename QtPrivate::if_<
            QtPrivate::is_unsigned<Enum>::value,
            unsigned int,
            signed int
        >::type Int;
#endif
    typedef Enum enum_type;
    // compiler-generated copy/move ctor/assignment operators are fine!
#ifdef Q_QDOC
    typedef int Int; // the real typedef above is too complex for qdoc
    inline QFlags(const QFlags &other);
    inline QFlags &operator=(const QFlags &other);
#endif
    Q_DECL_CONSTEXPR inline QFlags(Enum f) : i(f) {}
    Q_DECL_CONSTEXPR inline QFlags(Zero = 0) : i(0) {}
    Q_DECL_CONSTEXPR inline QFlags(QFlag f) : i(f) {}

    inline QFlags &operator&=(int mask) { i &= mask; return *this; }
    inline QFlags &operator&=(uint mask) { i &= mask; return *this; }
    inline QFlags &operator|=(QFlags f) { i |= f.i; return *this; }
    inline QFlags &operator|=(Enum f) { i |= f; return *this; }
    inline QFlags &operator^=(QFlags f) { i ^= f.i; return *this; }
    inline QFlags &operator^=(Enum f) { i ^= f; return *this; }

    Q_DECL_CONSTEXPR  inline operator Int() const { return i; }

    Q_DECL_CONSTEXPR inline QFlags operator|(QFlags f) const { return QFlags(Enum(i | f.i)); }
    Q_DECL_CONSTEXPR inline QFlags operator|(Enum f) const { return QFlags(Enum(i | f)); }
    Q_DECL_CONSTEXPR inline QFlags operator^(QFlags f) const { return QFlags(Enum(i ^ f.i)); }
    Q_DECL_CONSTEXPR inline QFlags operator^(Enum f) const { return QFlags(Enum(i ^ f)); }
    Q_DECL_CONSTEXPR inline QFlags operator&(int mask) const { return QFlags(Enum(i & mask)); }
    Q_DECL_CONSTEXPR inline QFlags operator&(uint mask) const { return QFlags(Enum(i & mask)); }
    Q_DECL_CONSTEXPR inline QFlags operator&(Enum f) const { return QFlags(Enum(i & f)); }
    Q_DECL_CONSTEXPR inline QFlags operator~() const { return QFlags(Enum(~i)); }

    Q_DECL_CONSTEXPR inline bool operator!() const { return !i; }

    Q_DECL_CONSTEXPR inline bool testFlag(Enum f) const { return (i & f) == f && (f != 0 || i == Int(f) ); }
private:
    Int i;
};

#define Q_DECLARE_FLAGS(Flags, Enum)\
typedef QFlags<Enum> Flags;

#define Q_DECLARE_INCOMPATIBLE_FLAGS(Flags) \
Q_DECL_CONSTEXPR inline QIncompatibleFlag operator|(Flags::enum_type f1, int f2) \
{ return QIncompatibleFlag(int(f1) | f2); }

#define Q_DECLARE_OPERATORS_FOR_FLAGS(Flags) \
Q_DECL_CONSTEXPR inline QFlags<Flags::enum_type> operator|(Flags::enum_type f1, Flags::enum_type f2) \
{ return QFlags<Flags::enum_type>(f1) | f2; } \
Q_DECL_CONSTEXPR inline QFlags<Flags::enum_type> operator|(Flags::enum_type f1, QFlags<Flags::enum_type> f2) \
{ return f2 | f1; } Q_DECLARE_INCOMPATIBLE_FLAGS(Flags)


#else /* Q_NO_TYPESAFE_FLAGS */

#define Q_DECLARE_FLAGS(Flags, Enum)\
typedef uint Flags;
#define Q_DECLARE_OPERATORS_FOR_FLAGS(Flags)

#endif /* Q_NO_TYPESAFE_FLAGS */

QT_END_NAMESPACE

#endif // QFLAGS_H