query.h

#ifndef _QUERY_H
#define _QUERY_H

#include <ostream>
using std::ostream;

#include <memory>
using std::shared_ptr;

#include <string>
using std::string;

#include "query_base.h"
#include "queryresult.h"
#include "wordquery.h"


class TextQuery;

class Query
{
	friend Query operator~(const Query&);
	friend Query operator|(const Query&, const Query&);
	friend Query operator&(const Query&, const Query&);
public:
	Query(const string&);
	//call QueryResult's default copy constructor.
	QueryResult eval(const TextQuery &t) const { return q->eval(t); }
	string rep() const { return q->rep(); }
private:
	Query(shared_ptr<Query_base> query) :q(query){ }
	shared_ptr<Query_base> q;
};

ostream & operator<<(ostream &os, const Query &query);

inline Query::Query(const string &s) :q(new WordQuery(s)){ }

#endif