88 lines
2.8 KiB
C++
88 lines
2.8 KiB
C++
/*=========================================================================
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Program: CMake - Cross-Platform Makefile Generator
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Module: $RCSfile$
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Language: C++
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Date: $Date$
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Version: $Revision$
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Copyright (c) 2002 Kitware, Inc., Insight Consortium. All rights reserved.
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See Copyright.txt or http://www.cmake.org/HTML/Copyright.html for details.
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This software is distributed WITHOUT ANY WARRANTY; without even
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the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR
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PURPOSE. See the above copyright notices for more information.
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=========================================================================*/
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#ifndef cmGeneratedFileStream_h
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#define cmGeneratedFileStream_h
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#include "cmStandardIncludes.h"
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// This is the first base class of cmGeneratedFileStream. It will be
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// created before and destroyed after the ofstream portion and can
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// therefore be used to manage the temporary file.
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class cmGeneratedFileStreamBase
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{
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protected:
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// The constructor prepares the temporary output file.
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cmGeneratedFileStreamBase(const char* name);
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// The destructor renames the temporary output file to the real name.
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~cmGeneratedFileStreamBase();
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// Internal file replacement implementation.
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int RenameFile(const char* oldname, const char* newname);
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// The name of the final destination file for the output.
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std::string m_Name;
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// The name of the temporary file.
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std::string m_TempName;
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// Whether to do a copy-if-different.
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bool m_CopyIfDifferent;
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// Whether the destination file should be replaced.
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bool m_Okay;
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};
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/** \class cmGeneratedFileStream
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* \brief Output stream for generated files.
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*
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* File generation should be atomic so that if CMake is killed then a
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* generated file is either the original version or the complete new
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* version. This stream is used to make sure file generation is
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* atomic. Optionally the output file is only replaced if its
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* contents have changed to prevent the file modification time from
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* being updated.
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*/
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class cmGeneratedFileStream: private cmGeneratedFileStreamBase,
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public std::ofstream
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{
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public:
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typedef std::ofstream Stream;
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/**
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* The constructor takes the name of the file to be generated. It
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* automatically generates a name for the temporary file. If the
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* file cannot be opened an error message is produced unless the
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* second argument is set to true.
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*/
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cmGeneratedFileStream(const char* name, bool quiet=false);
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/**
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* The destructor checks the stream status to be sure the temporary
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* file was successfully written before allowing the original to be
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* replaced.
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*/
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~cmGeneratedFileStream();
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/**
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* Set whether copy-if-different is done.
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*/
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void SetCopyIfDifferent(bool copy_if_different);
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};
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#endif
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