include/wx/flags.h

   1 /////////////////////////////////////////////////////////////////////////////
   2 // Name:        wx/flags.h
   3 // Purpose:     a bitset suited for replacing the current style flags
   4 // Author:      Stefan Csomor
   5 // Modified by:
   6 // Created:     27/07/03
   7 // RCS-ID:      $Id$
   8 // Copyright:   (c) 2003 Stefan Csomor
   9 // Licence:     wxWindows licence
  10 /////////////////////////////////////////////////////////////////////////////
  11
  12 #ifndef _WX_SETH__
  13 #define _WX_SETH__
  14
  15 #if defined(__GNUG__) && !defined(NO_GCC_PRAGMA)
  16 #pragma interface "flags.h"
  17 #endif
  18
  19 // wxBitset should be applied to an enum, then this can be used like
  20 // bitwise operators but keeps the type safety and information, the
  21 // enums must be in a sequence , their value determines the bit position
  22 // that they represent
  23 // The api is made as close as possible to <bitset>
  24
  25 template <class T> class wxBitset
  26 {
  27         friend class wxEnumData ;
  28 public:
  29     // creates a wxBitset<> object with all flags initialized to 0
  30     wxBitset() { m_data = 0; }
  31
  32     // created a wxBitset<> object initialized according to the bits of the
  33     // integral value val
  34     wxBitset(unsigned long val) { m_data = val ; }
  35
  36     // copies the content in the new wxBitset<> object from another one
  37     wxBitset(const wxBitset &src) { m_data = src.m_data; }
  38
  39     // creates a wxBitset<> object that has the specific flag set
  40     wxBitset(const T el) { m_data |= 1 << el; }
  41
  42     // returns the integral value that the bits of this object represent
  43     unsigned long to_ulong() const { return m_data ; }
  44
  45     // assignment
  46     wxBitset &operator =(const wxBitset &rhs)
  47     {
  48                 m_data = rhs.m_data;
  49                 return *this;
  50     }
  51
  52     // bitwise or operator, sets all bits that are in rhs and leaves
  53     // the rest unchanged
  54     wxBitset &operator |=(const wxBitset &rhs)
  55     {
  56                 m_data |= rhs.m_data;
  57                 return *this;
  58     }
  59
  60     // bitwsie exclusive-or operator, toggles the value of all bits
  61     // that are set in bits and leaves all others unchanged
  62     wxBitset &operator ^=(const wxBitset &rhs) // difference
  63     {
  64                 m_data ^= rhs.m_data;
  65                 return *this;
  66     }
  67
  68     // bitwise and operator, resets all bits that are not in rhs and leaves
  69     // all others unchanged
  70     wxBitset &operator &=(const wxBitset &rhs) // intersection
  71     {
  72                 m_data &= rhs.m_data;
  73                 return *this;
  74     }
  75
  76     // bitwise or operator, returns a new bitset that has all bits set that set are in
  77     // bitset2 or in this bitset
  78    wxBitset operator |(const wxBitset &bitset2) const // union
  79     {
  80                 wxBitset<T> s;
  81                 s.m_data = m_data | bitset2.m_data;
  82                 return s;
  83     }
  84
  85     // bitwise exclusive-or operator, returns a new bitset that has all bits set that are set either in
  86     // bitset2 or in this bitset but not in both
  87     wxBitset operator ^(const wxBitset &bitset2) const // difference
  88     {
  89                 wxBitset<T> s;
  90                 s.m_data = m_data ^ bitset2.m_data;
  91                 return s;
  92     }
  93
  94     // bitwise and operator, returns a new bitset that has all bits set that are set both in
  95     // bitset2 and in this bitset
  96     wxBitset operator &(const wxBitset &bitset2) const // intersection
  97     {
  98                 wxBitset<T> s;
  99                 s.m_data = m_data & bitset2.m_data;
 100                 return s;
 101     }
 102
 103     // sets appropriate the bit to true
 104     wxBitset& set(const T el) //Add element
 105     {
 106                 m_data |= 1 << el;
 107                 return *this;
 108     }
 109
 110     // clears the appropriate flag to false
 111     wxBitset& reset(const T el) //remove element
 112     {
 113                 m_data &= ~(1 << el);
 114                 return *this;
 115     }
 116
 117     // clear all flags
 118     wxBitset& reset()
 119     {
 120                 m_data = 0;
 121                 return *this;
 122     }
 123
 124     // true if this flag is set
 125     bool test(const T el) const
 126     {
 127                 return (m_data & (1 << el)) ? true : false;
 128     }
 129
 130     // true if no flag is set
 131     bool none() const
 132     {
 133                 return m_data == 0;
 134     }
 135
 136     // true if any flag is set
 137     bool any() const
 138     {
 139                 return m_data != 0;
 140     }
 141
 142     // true if both have the same flags
 143     bool operator ==(const wxBitset &rhs) const
 144     {
 145                 return m_data == rhs.m_data;
 146     }
 147
 148     // true if both differ in their flags set
 149     bool operator !=(const wxBitset &rhs) const
 150     {
 151                 return !operator==(rhs);
 152     }
 153
 154     bool operator[] (const T el) const { return test(el) ; }
 155
 156 private :
 157         unsigned long m_data;
 158 };
 159
 160 #define WX_DEFINE_FLAGS( flags ) \
 161     struct WXDLLEXPORT flags \
 162     {\
 163     flags(long data=0) :m_data(data) {} \
 164         long m_data ;\
 165     } ;
 166
 167 #endif