/usr/include/ThePEG/Utilities/HoldFlag.h is in libthepeg-dev 1.8.0-3build1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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//
// HoldFlag.h is a part of ThePEG - Toolkit for HEP Event Generation
// Copyright (C) 1999-2011 Leif Lonnblad
//
// ThePEG is licenced under version 2 of the GPL, see COPYING for details.
// Please respect the MCnet academic guidelines, see GUIDELINES for details.
//
#ifndef ThePEG_HoldFlag_H
#define ThePEG_HoldFlag_H
// This is the declaration of the HoldFlag class.
namespace ThePEG {
template <typename T = bool>
/**
* <code>HoldFlag</code> objects are used to temporarily change the value
* of an object, restoring the original value when the
* <code>HoldFlag</code> object is destructed.
*
* @see Level
*/
class HoldFlag {
public:
/**
* Constructor setting a temporary value for the given object.
* @param newFlag the object which value is temporarily changed.
* @param holdFlag the temporary value for the newFlag object.
*/
HoldFlag(T & newFlag, const T & holdFlag)
: theFlag(newFlag), oldFlag(holdFlag) { std::swap(theFlag, oldFlag); }
/**
* Constructor setting the a temporary value for the given object.
* @param newFlag the object which value is temporarily changed.
* @param holdFlag the temporary value for the newFlag object.
* @param finalFlag the newFlag object will be given the value
* finalFlag when the HoldFlag object is destroyed.
*/
HoldFlag(T & newFlag, const T & holdFlag, const T & finalFlag)
: theFlag(newFlag), oldFlag(holdFlag)
{
std::swap(theFlag, oldFlag);
oldFlag = finalFlag;
}
/**
* Destructor. Restores the corresponding object to its original
* value.
*/
~HoldFlag() { std::swap(theFlag, oldFlag); }
private:
/**
* The object to be changed.
*/
T & theFlag;
/**
* The value which will be restored when this is destroyed.
*/
T oldFlag;
/**
* Default constructor is private and not implemented.
*/
HoldFlag();
/**
* Copy constructor is private and not implemented.
*/
HoldFlag(const HoldFlag &);
/**
* Assignment is private and not implemented.
*/
HoldFlag & operator=(const HoldFlag &);
};
/**
* Specialization of HoldFlag for boolean variables.
*/
template <>
class HoldFlag<bool> {
public:
/**
* Constructor setting the a temporary value for the bool variable.
* @param newFlag the boolean variable which value is temporarily changed.
* @param holdFlag the temporary value for the newFlag variable.
*/
HoldFlag(bool & newFlag, bool holdFlag = true)
: theFlag(newFlag), oldFlag(newFlag) { theFlag = holdFlag; }
/**
* Constructor setting the a temporary value for the bool variable.
* @param newFlag the boolean variable which value is temporarily changed.
* @param holdFlag the temporary value for the newFlag variable.
* @param finalFlag the newFlag variable will be given the value
* finalFlag when the HoldFlag object is destroyed.
*/
HoldFlag(bool & newFlag, bool holdFlag, bool finalFlag)
: theFlag(newFlag), oldFlag(finalFlag) { theFlag = holdFlag; }
/**
* Destructor. Restores the corresponding variable to its original
* value.
*/
~HoldFlag() { theFlag = oldFlag; }
private:
/**
* The variable to be changed.
*/
bool & theFlag;
/**
* The value which will be restored when this is destroyed.
*/
bool oldFlag;
/**
* Default constructor is private and not implemented.
*/
HoldFlag();
/**
* Copy constructor is private and not implemented.
*/
HoldFlag(const HoldFlag &);
/**
* Assignment is private and not implemented.
*/
HoldFlag & operator=(const HoldFlag &);
};
}
#endif /* ThePEG_HoldFlag_H */
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