debug.h

这是一款很好用的工具包

/*
 * Debug.h --
 *	General object debugging facility
 *
 * Debug is a Mix-in class that provides some simple, but consistent
 * debugging output handling.
 *
 * Copyright (c) 1995, SRI International.  All Rights Reserved.
 *
 * @(#)$Header: /home/srilm/devel/misc/src/RCS/Debug.h,v 1.4 2006/01/05 19:32:42 stolcke Exp $
 *
 */

#ifndef _Debug_h_
#define _Debug_h_

#include <iostream>
using namespace std;

#include <Boolean.h>

/*
 * Here is the typical usage for this mixin class.
 * First, include it in the parents of some class FOO
 *
 * class FOO: public OTHER_PARENT, public FOO { ... }
 *
 * Inside FOO's methods use code such as
 *
 *	if (debug(3)) {
 *	   dout() << "I'm feeling sick today\n";
 *	}
 *
 * Finally, use that code, after setting the debugging level
 * of the object and/or redirecting the debugging output.
 *
 *      FOO foo;
 *	foo.debugme(4); foo.dout(cout);
 *
 * Debugging can also be set globally (to affect all objects of
 * all classes.
 *
 *	foo.debugall(1);
 *
 */
class Debug
{
public:
    Debug(unsigned level = 0)
      : debugLevel(level), debugStream(&cerr), nodebug(false) {};

    Boolean debug(unsigned level)   /* true if debugging */
	{ return (!nodebug && (debugAll >= level || debugLevel >= level)); };
    virtual void debugme(unsigned level) { debugLevel = level; };
				    /* set object's debugging level */
    void debugall(unsigned level) { debugAll = level; };
				    /* set global debugging level */
    unsigned debuglevel() { return debugLevel; };

    virtual ostream &dout() { return *debugStream; };
				    /* output stream for use with << */
    virtual ostream &dout(ostream &stream)  /* redirect debugging output */
	{ debugStream = &stream; return stream; };

    Boolean nodebug;		    /* temporarily disable debugging */
private:
    static unsigned debugAll;	    /* global debugging level */
    unsigned debugLevel;	    /* level of output -- the higher the more*/
    ostream *debugStream;	    /* current debug output stream */
};

#endif /* _Debug_h_ */