ShBitSet.hpp

// Sh: A GPU metaprogramming language.
//
// Copyright 2003-2005 Serious Hack Inc.
// 
// This software is provided 'as-is', without any express or implied
// warranty. In no event will the authors be held liable for any damages
// arising from the use of this software.
// 
// Permission is granted to anyone to use this software for any purpose,
// including commercial applications, and to alter it and redistribute it
// freely, subject to the following restrictions:
// 
// 1. The origin of this software must not be misrepresented; you must
// not claim that you wrote the original software. If you use this
// software in a product, an acknowledgment in the product documentation
// would be appreciated but is not required.
// 
// 2. Altered source versions must be plainly marked as such, and must
// not be misrepresented as being the original software.
// 
// 3. This notice may not be removed or altered from any source
// distribution.
#ifndef SHBITSET_HPP
#define SHBITSET_HPP

#include <cstddef>
#include <iosfwd>
#include "ShDllExport.hpp"

namespace SH {

/* A reference to a single bit in a set.
 * @see ShBitSet
 */
class
SH_DLLEXPORT ShBitRef {
public:
  operator bool() const;
  ShBitRef& operator=(bool b);

private:
  friend class ShBitSet;
  
  ShBitRef(unsigned int* byte, unsigned int mask);

  unsigned int* m_byte;
  unsigned int m_mask;

  ShBitRef(const ShBitRef& other);
  ShBitRef& operator=(const ShBitRef& other);
};

class
SH_DLLEXPORT ShBitSet {
public:
  ShBitSet();
  explicit ShBitSet(std::size_t size);
  ShBitSet(const ShBitSet& other);
  
  ~ShBitSet();

  ShBitSet& operator=(const ShBitSet& other);
  ShBitSet& operator&=(const ShBitSet& other);
  ShBitSet& operator|=(const ShBitSet& other);
  ShBitSet& operator^=(const ShBitSet& other);

  ShBitSet operator&(const ShBitSet& other) const;
  ShBitSet operator|(const ShBitSet& other) const;
  ShBitSet operator^(const ShBitSet& other) const;
  
  ShBitSet operator~() const;

  bool operator==(const ShBitSet& other) const;
  bool operator!=(const ShBitSet& other) const;

  // Return true iff all entries are 1
  bool full() const;
  // Return true iff all entries are 0
  bool empty() const;
  
  std::size_t size() const;

  bool operator[](std::size_t i) const;
  ShBitRef operator[](std::size_t i);

private:
  std::size_t m_size;
  unsigned int* m_data;
};

SH_DLLEXPORT
std::ostream& operator<<(std::ostream& out, const ShBitSet& bitset);

}

#endif

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