57 lines
1.7 KiB
C++
57 lines
1.7 KiB
C++
/*
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* Copyright (C) 2008-2009 Patrick Ohly <patrick.ohly@gmx.de>
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) version 3.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
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* 02110-1301 USA
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*/
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#ifndef INCL_EVOLUTION_SAFE_OSTREAM
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# define INCL_EVOLUTION_SAFE_OSTREAM
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#include <fstream>
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#include <string>
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#include <syncevo/declarations.h>
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SE_BEGIN_CXX
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/**
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* Writes into temporary file (.# prefix) first, then renames to real
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* file only when no error encountered at the time of deleting the
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* instance. Once instantiated, the only way to safe the content of the
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* real file is to set the "fail" bit. In that sense it is similar to
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* instantiating a normal ofstream, which would directly overwrite
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* the file at creation time.
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*/
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class SafeOstream : public std::ofstream
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{
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std::string m_filename;
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std::string m_tmpFilename;
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public:
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/**
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* @param filename real filename, without the .# prefix
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*/
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SafeOstream(const std::string filename);
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/**
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* on success, rename file
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*/
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~SafeOstream();
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};
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SE_END_CXX
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#endif // INCL_EVOLUTION_SAFE_OSTREAM
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