IstreamBufIterator.hpp

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00001 /*******************************************************************************
00002 * Copyright (C) 2004 Vintela, Inc. All rights reserved.
00003 * Copyright (C) 2005 Novell, Inc. All rights reserved.
00004 *
00005 * Redistribution and use in source and binary forms, with or without
00006 * modification, are permitted provided that the following conditions are met:
00007 *
00008 *  - Redistributions of source code must retain the above copyright notice,
00009 *    this list of conditions and the following disclaimer.
00010 *
00011 *  - Redistributions in binary form must reproduce the above copyright notice,
00012 *    this list of conditions and the following disclaimer in the documentation
00013 *    and/or other materials provided with the distribution.
00014 *
00015 *  - Neither the name of Vintela, Inc., Novell, Inc., nor the names of its
00016 *    contributors may be used to endorse or promote products derived from this
00017 *    software without specific prior written permission.
00018 *
00019 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS ``AS IS''
00020 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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00022 * ARE DISCLAIMED. IN NO EVENT SHALL Vintela, Inc., Novell, Inc., OR THE 
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00031 
00032 
00037 #ifndef BLOCXX_ISTREAMBUFITERATOR_HPP_INCLUDE_GUARD_
00038 #define BLOCXX_ISTREAMBUFITERATOR_HPP_INCLUDE_GUARD_
00039 #include "blocxx/BLOCXX_config.h"
00040 #if defined(BLOCXX_HAVE_ISTREAM)
00041 #include <istream>
00042 #else
00043 #include <iostream>
00044 #endif
00045 
00046 
00047 namespace BLOCXX_NAMESPACE
00048 {
00049 
00055 class IstreamBufIterator
00056 {
00057 public:
00058    class proxy
00059    {
00060       friend class IstreamBufIterator;
00061    public:
00062       char operator*() {  return m_keep; }
00063    private:
00064       proxy(char c) : m_keep(c) {}
00065       char m_keep;
00066    };
00067    IstreamBufIterator() : m_sbuf(0) {}
00068    IstreamBufIterator(std::istream& s) : m_sbuf(s.rdbuf()) {}
00069    IstreamBufIterator(std::streambuf* b) : m_sbuf(b) {}
00070    char operator*() const
00071    {
00072       if (m_sbuf)
00073       {
00074          return (m_sbuf->sgetc());
00075       }
00076       else
00077       {
00078          return 0;
00079       }
00080    }
00081    IstreamBufIterator& operator++()
00082    {
00083       m_sbuf->sbumpc();
00084       if (m_sbuf->sgetc() == EOF)
00085       {
00086          m_sbuf = 0;
00087       }
00088       return *this;
00089    }
00090    proxy operator++(int)
00091    {
00092       proxy temp(m_sbuf->sgetc());
00093       m_sbuf->sbumpc();
00094       if (m_sbuf->sgetc() == EOF)
00095       {
00096          m_sbuf = 0;
00097       }
00098       return temp;
00099    }
00100    
00101    bool equal(const IstreamBufIterator& b) const
00102    {
00103       return (m_sbuf == 0) ^ (b.m_sbuf != 0);   // do a little manual strength reduction
00104 //         if (((m_sbuf == 0) && (b.m_sbuf == 0)) || ((m_sbuf != 0) && (b.m_sbuf != 0)))
00105 //         {
00106 //             return true;
00107 //         }
00108 //         else
00109 //         {
00110 //             return false;
00111 //         }
00112    }
00113 private:
00114    std::streambuf* m_sbuf;
00115 };
00116 inline bool operator==(const IstreamBufIterator& lhs, const IstreamBufIterator& rhs)
00117 {
00118    return lhs.equal(rhs);
00119 }
00120 inline bool operator!=(const IstreamBufIterator& lhs, const IstreamBufIterator& rhs)
00121 {
00122    return !lhs.equal(rhs);
00123 }
00124 
00125 } // end namespace BLOCXX_NAMESPACE
00126 
00127 #endif

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