Level.h
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Level.h
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	// -- C++ --
	//
	// Level.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_Level_H
	#define ThePEG_Level_H
	// This is the declaration of the Level class.

	#include "ThePEG/Config/ThePEG.h"

	namespace ThePEG {

	/**
	* Level is used to increment temporarily a given integer
	* variable. Everytime a Level object is created with a given integer
	* variable as argument, the variable will be incremented. When the
	* corresponding Level object is destroyed, the associated integer
	* variable is decremented again.
	*
	* @see HoldFlag
	*/
	template <typename T = int>
	class Level {

	public:

	/** Constructor taking an integer variable which is incremented. A
	* reference to the variable will be stored. */
	Level(T & newLevel) : theLevel(++newLevel) {}

	/** Destructor decrementing the associated integer variable. */
	~Level() { --theLevel; }

	private:

	/** A reference to the integer variable to be decremmmented when
	* this object is destroyed. */
	T & theLevel;

	/**
	* Default constructor is private and not implemented.
	*/
	Level();

	/**
	* Copy constructor is private and not implemented.
	*/
	Level(const Level &);

	/**
	* Assignment is private and not implemented.
	*/
	Level & operator=(const Level &);

	};

	}

	#endif /* ThePEG_Level_H */