src/base/flags.hh

   1 /*
   2  * Copyright (c) 2008 The Hewlett-Packard Development Company
   3  * All rights reserved.
   4  *
   5  * Redistribution and use in source and binary forms, with or without
   6  * modification, are permitted provided that the following conditions are
   7  * met: redistributions of source code must retain the above copyright
   8  * notice, this list of conditions and the following disclaimer;
   9  * redistributions in binary form must reproduce the above copyright
  10  * notice, this list of conditions and the following disclaimer in the
  11  * documentation and/or other materials provided with the distribution;
  12  * neither the name of the copyright holders nor the names of its
  13  * contributors may be used to endorse or promote products derived from
  14  * this software without specific prior written permission.
  15  *
  16  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  17  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
  18  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
  19  * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
  20  * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
  21  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
  22  * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  23  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  24  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  25  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
  26  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  27  */
  28
  29 #ifndef __BASE_FLAGS_HH__
  30 #define __BASE_FLAGS_HH__
  31
  32 template <typename T>
  33 class Flags
  34 {
  35   private:
  36     T _flags;
  37
  38   public:
  39     typedef T Type;
  40     Flags() : _flags(0) {}
  41     Flags(Type flags) : _flags(flags) {}
  42
  43     operator const Type() const { return _flags; }
  44
  45     template <typename U>
  46     const Flags<T> &
  47     operator=(const Flags<U> &flags)
  48     {
  49         _flags = flags._flags;
  50         return *this;
  51     }
  52
  53     const Flags<T> &
  54     operator=(T flags)
  55     {
  56         _flags = flags;
  57         return *this;
  58     }
  59
  60     bool isSet() const { return _flags; }
  61     bool isSet(Type flags) const { return (_flags & flags); }
  62     bool allSet() const { return !(~_flags); }
  63     bool allSet(Type flags) const { return (_flags & flags) == flags; }
  64     bool noneSet() const { return _flags == 0; }
  65     bool noneSet(Type flags) const { return (_flags & flags) == 0; }
  66     void clear() { _flags = 0; }
  67     void clear(Type flags) { _flags &= ~flags; }
  68     void set(Type flags) { _flags |= flags; }
  69     void set(Type f, bool val) { _flags = (_flags & ~f) | (val ? f : 0); }
  70     void
  71     update(Type flags, Type mask)
  72     {
  73         _flags = (_flags & ~mask) | (flags & mask);
  74     }
  75 };
  76
  77 #endif // __BASE_FLAGS_HH__