/*
 * attributes and attribute sets
 */

#ifndef ATTR_H
#define ATTR_H 

#include <string>
#include <map>

#include "lsys.h"
#include "util.h"
#include "matrix.h"

using namespace std;

struct attribute_set : public shared<module_map> {
	const module *operator ()(const string &attr) const t_no
	  { const_iterator i; return (i = obj->find (attr)) == end () ? 0 : &i->second; }
	string operator ()(const string &attr, const string &def) const t_no
	  { const_iterator i; return (i = obj->find (attr)) == end () ? def : i->second.first ().str; }
	double operator ()(const string &attr, double def) const t_err
	  { const_iterator i; return (i = obj->find (attr)) == end () ? def : eval_expr (i->second); }
	vec operator ()(const string &attr, const vec &def) const t_err;
	
	const_iterator find (const string &s) const t_no { return obj->find (s); };
	
	const module &operator [](const string &s) const t_no {             return (*obj)[s]; };
	      module &operator [](const string &s)       t_no { unshare (); return (*obj)[s]; };
};

#endif