root/ggpa/VariableAssignmentIterator.h

/*
 * VariableAssignmentIterator
 * Helper class to iterate through the different assignments of variables
 */

#ifndef VARIABLEASSIGNMENTITERATOR_H
#define VARIABLEASSIGNMENTITERATOR_H

#include <map>
#include <vector>
#include <iostream>

using namespace std;

class VariableAssignmentIterator {

 private:
    //vector storing the possible values for each variable 
    //vector<vector<string> > possibleValues;

    //map storing the current indices representing the values for each variable
    map<string, unsigned int> indexValues;

    // mapping from variable names to their possible values
    map<string, vector<string> > possibleValues;

    // a list of the variable names
    vector<string> variables;

    // a boolean indicating that the iterator has traversed all possiblities.
    bool done;

 public:
    
    /**
     * Constructor
     * Parameters:  variableMap - a map from variable names to their set
     *                            of possible values
     * Initializes the VariableAssignmentIterator
     */ 
    VariableAssignmentIterator(const map<string, vector<string> >& variableMap);
   
    /**
     * next
     * No parameters or return type.
     * Move to the next value mapping
     */
    void next();

    /**
     * getCurrent
     * No parameters.
     * Return type: map from strings to strings
     * Returns the current mapping from variable name to variable value
     */
    map<string, string> getCurrent();

    /**
     * atEnd
     * Parameters: none
     * Return type: bool
     * Returns true if there are no more mappings of variables, and false
     * otherwise.
     */
    bool atEnd() const;

};

#endif