dictionary.h

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#ifndef __DICTIONARY_H__
#define __DICTIONARY_H__
 
#include <iostream>
#include <set>
#include <vector>
#include <string>
 
using namespace std;
 
class Dictionary {
private:
    set <string> words;
public:
    Dictionary();
 
    Dictionary(const Dictionary& othr);
 
    Dictionary  (const string & file_name);
 
 
    bool exists(const string &s) const;
 
    bool insert(const string &s);
 
    bool erase(const string &s);
 
    void clear();
 
    bool empty() const;
 
    unsigned int size() const;
 
    vector<string> wordsOfLength(int length) const;
 
    int getOcurrences(char c) const;
 
    void anade(const Dictionary &dic);
 
    friend istream& operator>>(istream &is, Dictionary &dic);
 
    friend ostream& operator<<(ostream &os, const Dictionary& dic);
 
    class iterator{
        private:
            set<string>::iterator it;
        public:
            iterator & operator++(){++it;return *this;}
            iterator & operator--(){--it;return *this;}
            bool operator==(const iterator &i) const{return it==i.it;}
            bool operator!=(const iterator &i) const{return it!=i.it;}
            const string& operator* (){return *it;}
            friend class Dictionary;
    };
 
    iterator begin() const {
        iterator i;
        i.it = words.begin();
        return i;
    }
 
    iterator end() const {
        iterator i;
        i.it = words.end();
        return i;
    }
 
private:
 
    void LoadDictionary(const string &file_name);
};
 
 
int count_ocurrences(char c, const string& word, size_t pos = 0);
 
#endif