OW_IstreamBufIterator.hpp

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#ifndef OW_ISTREAMBUFITERATOR_HPP_INCLUDE_GUARD_
#define OW_ISTREAMBUFITERATOR_HPP_INCLUDE_GUARD_
#include "OW_config.h"
#if defined(OW_HAVE_ISTREAM)
#include <istream>
#else
#include <iostream>
#endif


namespace OW_NAMESPACE
{

class IstreamBufIterator
{
public:
   class proxy
   {
      friend class IstreamBufIterator;
   public:
      char operator*() {  return m_keep; }
   private:
      proxy(char c) : m_keep(c) {}
      char m_keep;
   };
   IstreamBufIterator() : m_sbuf(0) {}
   IstreamBufIterator(std::istream& s) : m_sbuf(s.rdbuf()) {}
   IstreamBufIterator(std::streambuf* b) : m_sbuf(b) {}
   char operator*() const
   {
      if (m_sbuf)
      {
         return (m_sbuf->sgetc());
      }
      else
      {
         return 0;
      }
   }
   IstreamBufIterator& operator++()
   {
      m_sbuf->sbumpc();
      if (m_sbuf->sgetc() == EOF)
      {
         m_sbuf = 0;
      }
      return *this;
   }
   proxy operator++(int)
   {
      proxy temp(m_sbuf->sgetc());
      m_sbuf->sbumpc();
      if (m_sbuf->sgetc() == EOF)
      {
         m_sbuf = 0;
      }
      return temp;
   }
   
   bool equal(const IstreamBufIterator& b) const
   {
      return (m_sbuf == 0) ^ (b.m_sbuf != 0);   // do a little manual strength reduction
//         if (((m_sbuf == 0) && (b.m_sbuf == 0)) || ((m_sbuf != 0) && (b.m_sbuf != 0)))
//         {
//             return true;
//         }
//         else
//         {
//             return false;
//         }
   }
private:
   std::streambuf* m_sbuf;
};
inline bool operator==(const IstreamBufIterator& lhs, const IstreamBufIterator& rhs)
{
   return lhs.equal(rhs);
}
inline bool operator!=(const IstreamBufIterator& lhs, const IstreamBufIterator& rhs)
{
   return !lhs.equal(rhs);
}

} // end namespace OW_NAMESPACE

#endif

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