Flags.h

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#ifndef ZYPP_BASE_FLAGS_H
#define ZYPP_BASE_FLAGS_H

#include "zypp/base/String.h"

namespace zypp
{ 
  namespace base
  { 

    //
    //  CLASS NAME : Flags<Enum>
    //
    template<typename _Enum>
    class Flags
    {
      public:
        typedef _Enum Enum;     
        typedef typename std::underlying_type<Enum>::type Integral;     

      public:
        constexpr Flags()                               : _val( 0 ) {}
        constexpr Flags( Enum flag_r )                  : _val( flag_r ) {}
        explicit constexpr Flags( Integral flag_r )     : _val( flag_r ) {}

        Flags & operator&=( Flags rhs )       { _val &= rhs._val; return *this; }
        Flags & operator&=( Enum rhs )        { _val &= rhs;      return *this; }

        Flags & operator|=( Flags rhs )       { _val |= rhs._val; return *this; }
        Flags & operator|=( Enum rhs )        { _val |= rhs;      return *this; }

        Flags & operator^=( Flags rhs )       { _val ^= rhs._val; return *this; }
        Flags & operator^=( Enum rhs )        { _val ^= rhs;      return *this; }

      public:
        constexpr operator Integral() const             { return _val; }

        constexpr Flags operator&( Flags rhs ) const    { return Flags( _val & rhs._val ); }
        constexpr Flags operator&( Enum rhs ) const     { return Flags( _val & rhs ); }

        constexpr Flags operator|( Flags rhs ) const    { return Flags( _val | rhs._val ); }
        constexpr Flags operator|( Enum rhs ) const     { return Flags( _val | rhs ); }

        constexpr Flags operator^( Flags rhs ) const    { return Flags( _val ^ rhs._val ); }
        constexpr Flags operator^( Enum rhs ) const     { return Flags( _val ^ rhs ); }

        constexpr Flags operator~() const               { return Flags( ~_val ); }

      public:
        Flags & setFlag( Flags flag_r, bool newval_r ) { return( newval_r ? setFlag(flag_r) : unsetFlag(flag_r) ); }
        Flags & setFlag( Enum flag_r, bool newval_r )  { return( newval_r ? setFlag(flag_r) : unsetFlag(flag_r) ); }

        Flags & setFlag( Flags flag_r )       { _val |= flag_r; return *this; }
        Flags & setFlag( Enum flag_r )        { _val |= flag_r; return *this; }

        Flags & unsetFlag( Flags flag_r )     { _val &= ~flag_r; return *this; }
        Flags & unsetFlag( Enum flag_r )      { _val &= ~flag_r; return *this; }

        bool testFlag( Flags flag_r ) const   { return ( _val & flag_r ) == flag_r; }
        bool testFlag( Enum flag_r ) const    { return ( _val & flag_r ) == flag_r; }

      private:
        Integral _val;
    };

    template<typename Enum>
    inline std::ostream & operator<<( std::ostream & str, const Flags<Enum> & obj )
    { return str << str::hexstring(obj); }

#define ZYPP_DECLARE_FLAGS(Name,Enum) typedef zypp::base::Flags<Enum> Name

#define ZYPP_DECLARE_OPERATORS_FOR_FLAGS(Name) \
inline constexpr Name operator&( Name::Enum lhs, Name::Enum rhs )       { return Name( lhs ) & rhs; }   \
inline constexpr Name operator&( Name::Enum lhs, Name rhs )             { return rhs & lhs; }           \
inline constexpr Name operator|( Name::Enum lhs, Name::Enum rhs )       { return Name( lhs ) | rhs; }   \
inline constexpr Name operator|( Name::Enum lhs, Name rhs )             { return rhs | lhs; }           \
inline constexpr Name operator^( Name::Enum lhs, Name::Enum rhs )       { return Name( lhs ) ^ rhs; }   \
inline constexpr Name operator^( Name::Enum lhs, Name rhs )             { return rhs ^ lhs; }           \
inline constexpr Name operator~( Name::Enum lhs )                       { return ~Name( lhs ); }

#define ZYPP_DECLARE_FLAGS_AND_OPERATORS(Name,Enum) \
    ZYPP_DECLARE_FLAGS(Name,Enum); \
    ZYPP_DECLARE_OPERATORS_FOR_FLAGS(Name)

  } // namespace base
} // namespace zypp
#endif // ZYPP_BASE_FLAGS_H