// Garbage Collector Definitions
//
// File:        gc.h
// Author:      {your name} <{your e-mail address}>
// Assignment:	9

// This is the ONLY .h file you modify.  You make
// additions to it in assignment 9.

// This code is used only by modules that define new
// types of LISP object.

#ifndef GC_H
#define GC_H

#include "object.h"

class garbage_collector
{

public:

    // This class has only static members and friends
    // and no instances.

    // Garbage collect, no matter what.
    //
    friend void gc();

    // Gc's occur every gc_limit allocations.  You can
    // get and set gc_limit with these functions.
    //
    friend unsigned long int set_gc_limit
	(unsigned long lim);
    friend unsigned long int gc_limit ();

    // Replace these two lines with your own friends
    // and static functions.

private:

    static unsigned long limit;	// gc_limit value.

    // Replace these two lines with any static
    // data you desire.

}; 

// Inline implementations of above.  See above for
// documentation.

inline unsigned long int set_gc_limit
	(unsigned long lim)
    { return garbage_collector::limit = lim; }
inline unsigned long int gc_limit ()
    { return garbage_collector::limit; }

// Replace these two lines with any inline function
// implementations you desire.

#endif // GC_H