/usr/include/ThePEG/Utilities/Direction.h is in libthepeg-dev 1.8.0-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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//
// Direction.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_Direction_H
#define ThePEG_Direction_H
// This is the declaration of the Direction class.
#include "ThePEG/Config/ThePEG.h"
#include "Direction.xh"
namespace ThePEG {
template <int I>
/**
* A <code>Direction</code> object can be used to specify that some
* following operations should be assumed to be performed with the
* z-direction of the momenta reversed. As an example, if
* <code>Direction<0>::pos()</code> is true, the method
* <code>Lorentz5Momentum::dirPlus()</code> will return the positive,
* light-cone component, and <code>Lorentz5Momentum::dirMinus()</code>
* the negative, while if <code>Direction<0>::pos()</code> is false
* the behavior of the methods are reversed.
*
* <code>Direction</code> is templated with an integer template argument
* (default = 0), and only one object per class can be instatiated at
* the time. Attempts to instatiate a second object of a
* <code>Direction</code> class will result in an exception being
* thrown. To have several different directions classes with different
* template arguments must be instantiated. <code>Direction<0></code> is
* reserved for <code>Lorentz5Momentum</code>. Attempts to use the
* static methods of a <code>Direction</code> class when no object has
* been instatiated will result in an exception being thrown.
*
* @see Lorentz5Momentum
*/
class Direction {
public:
/** The enum defining the directions. */
enum Dir { Neg = -1, /**< Reversed direction. */
Negative = -1, /**< Reversed direction. */
Undefined = 0, /**< No direction has been defined. */
Pos = 1, /**< Standard (positive) direction. */
Positive = 1 /**< Standard (positive) direction. */
};
public:
/**
* Create an object with a given direction.
*/
Direction(Dir newDirection)
{
if ( theDirection != Undefined ) throw MultipleDirectionException(I);
if ( newDirection == Positive ) theDirection = Positive;
else if ( newDirection == Negative ) theDirection = Negative;
else throw UndefinedDirectionException(I);
}
/**
* Create an object with a positive direction if rnd > 0.5,
* otherwise set the negative direction.
*/
Direction(double rnd)
{
if ( theDirection != Undefined ) throw MultipleDirectionException(I);
theDirection = rnd > 0 ? Positive : Negative;
}
/**
* Create an object with a positive direction if p is true,
* otherwise set the negative direction.
*/
Direction(bool p)
{
if ( theDirection != Undefined ) throw MultipleDirectionException(I);
theDirection = p ? Positive : Negative;
}
/**
* Destructure makeing the static variable undefined.
*/
~Direction() { theDirection = Undefined; }
public:
/**
* Set the direction.
*/
static void set(Dir newDirection) {
if ( newDirection == Positive ) theDirection = Positive;
else if ( newDirection == Negative ) theDirection = Negative;
else throw UndefinedDirectionException(I);
}
/**
* Reverse the direction.
*/
static void reverse() {
theDirection = pos() ? Negative : Positive;
}
/**
* Return true if the direction is positive.
*/
static bool pos() {
return dir() == Positive;
}
/**
* Return true if the direction is negative (reversed).
*/
static bool neg() {
return dir() == Negative;
}
/**
* Return the direction.
*/
static Dir dir() {
if ( theDirection == Undefined ) throw UndefinedDirectionException(I);
return theDirection;
}
private:
/**
* The direction.
*/
static Dir theDirection;
private:
/**
* Default ctors and assignment is private and not implemented.
*/
Direction();
/**
* Default ctors and assignment is private and not implemented.
*/
Direction(const Direction &);
/**
* Default ctors and assignment is private and not implemented.
*/
Direction & operator=(const Direction &);
};
template<int I>
typename Direction<I>::Dir Direction<I>::theDirection = Direction<I>::Undefined;
}
#endif /* ThePEG_Direction_H */
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