Rel.h

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#ifndef ZYPP_REL_H
#define ZYPP_REL_H

#include <iosfwd>
#include <string>

namespace zypp
{ 

  //
  //    CLASS NAME : Rel
  //
  struct Rel
  {
    static const Rel EQ;
    static const Rel NE;
    static const Rel LT;
    static const Rel LE;
    static const Rel GT;
    static const Rel GE;
    static const Rel ANY;
    static const Rel NONE;

    enum for_use_in_switch {
      NONE_e = 0U,
      GT_e   = 1U,
      EQ_e   = 2U,
      LT_e   = 4U,
      GE_e   = GT_e|EQ_e,
      LE_e   = LT_e|EQ_e,
      NE_e   = GT_e|LT_e,
      ANY_e  = GT_e|EQ_e|LT_e,
    };

    Rel()
    : _op( ANY_e )
    {}

    explicit
    Rel( const std::string & strval_r );

    Rel( const std::string & strval_r, const Rel & default_r );

    bool parseFrom( const std::string & strval_r );

    explicit
    Rel( unsigned bits_r )
    : _op( for_use_in_switch(bits_r & ANY_e) )
    {}

    static bool isRel( unsigned bits_r )
    { return (bits_r & ANY_e) == bits_r; }

    const std::string & asString() const;
    const char * c_str() const
    { return asString().c_str(); }

    for_use_in_switch inSwitch() const
    { return _op; }

    unsigned bits() const
    { return _op; }

  private:
    Rel( for_use_in_switch op_r )
    : _op( op_r )
    {}
    for_use_in_switch _op;
  };

  inline std::ostream & operator<<( std::ostream & str, const Rel & obj )
  { return str << obj.asString(); }


  inline bool operator==( const Rel & lhs, const Rel & rhs )
  { return lhs.inSwitch() == rhs.inSwitch(); }

  inline bool operator!=( const Rel & lhs, const Rel & rhs )
  { return ! ( lhs == rhs ); }

} // namespace zypp
#endif // ZYPP_REL_H