tail_output_stream.hh

00001 /* vim: set sw=4 sts=4 et foldmethod=syntax : */
00002 
00003 /*
00004  * Copyright (c) 2008 Ciaran McCreesh
00005  *
00006  * This file is part of the Paludis package manager. Paludis is free software;
00007  * you can redistribute it and/or modify it under the terms of the GNU General
00008  * Public License version 2, as published by the Free Software Foundation.
00009  *
00010  * Paludis is distributed in the hope that it will be useful, but WITHOUT ANY
00011  * WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
00012  * FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more
00013  * details.
00014  *
00015  * You should have received a copy of the GNU General Public License along with
00016  * this program; if not, write to the Free Software Foundation, Inc., 59 Temple
00017  * Place, Suite 330, Boston, MA  02111-1307  USA
00018  */
00019 
00020 #ifndef PALUDIS_GUARD_PALUDIS_UTIL_TAIL_OUTPUT_STREAM_HH
00021 #define PALUDIS_GUARD_PALUDIS_UTIL_TAIL_OUTPUT_STREAM_HH 1
00022 
00023 #include <paludis/util/tail_output_stream-fwd.hh>
00024 #include <paludis/util/attributes.hh>
00025 #include <paludis/util/private_implementation_pattern.hh>
00026 #include <paludis/util/sequence.hh>
00027 #include <tr1/memory>
00028 #include <ostream>
00029 
00030 namespace paludis
00031 {
00032     class PALUDIS_VISIBLE TailOutputStreamBuf :
00033         public std::streambuf,
00034         private PrivateImplementationPattern<TailOutputStreamBuf>
00035     {
00036         private:
00037             void _append(const std::string &);
00038 
00039         protected:
00040             virtual int_type
00041             overflow(int_type c);
00042 
00043             virtual std::streamsize
00044             xsputn(const char * s, std::streamsize num);
00045 
00046         public:
00047             TailOutputStreamBuf(const unsigned n);
00048             ~TailOutputStreamBuf();
00049 
00050             const std::tr1::shared_ptr<const Sequence<std::string> > tail(const bool clear);
00051     };
00052 
00053     class PALUDIS_VISIBLE TailOutputStreamBase
00054     {
00055         protected:
00056             TailOutputStreamBuf buf;
00057 
00058         public:
00059             TailOutputStreamBase(const unsigned n) :
00060                 buf(n)
00061             {
00062             }
00063     };
00064 
00065     class PALUDIS_VISIBLE TailOutputStream :
00066         protected TailOutputStreamBase,
00067         public std::ostream
00068     {
00069         public:
00070             ///\name Basic operations
00071             ///\{
00072 
00073             TailOutputStream(const unsigned n) :
00074                 TailOutputStreamBase(n),
00075                 std::ostream(&buf)
00076             {
00077             }
00078 
00079             const std::tr1::shared_ptr<const Sequence<std::string> > tail(const bool clear_after)
00080             {
00081                 return buf.tail(clear_after);
00082             }
00083 
00084             ///\}
00085     };
00086 
00087 #ifdef PALUDIS_HAVE_EXTERN_TEMPLATE
00088     extern template class PrivateImplementationPattern<TailOutputStreamBuf>;
00089 #endif
00090 }
00091 
00092 #endif

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