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