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1 | #ifndef STOPOS_KEY_H |
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2 | #define STOPOS_KEY_H |
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3 | #include <string> |
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4 | #include <iostream> |
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5 | |
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6 | class stopos_key |
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7 | { |
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8 | protected: |
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9 | std::string value; |
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10 | static const char firstchar = 'a'; |
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11 | static const char lastchar = 'z'; |
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12 | static const unsigned int base = lastchar - firstchar + 1; |
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13 | template <typename T> void tostring1(std::string &v,const T n) |
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14 | { |
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15 | if (n == 0) |
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16 | return; |
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17 | unsigned int c = n + firstchar - base*(n/base); |
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18 | tostring1(v,n/base); |
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19 | v.push_back(c); |
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20 | } |
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21 | template <typename T> void tostring(std::string &v,const T n) |
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22 | { |
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23 | if (n == 0) |
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24 | v = firstchar; |
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25 | else |
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26 | tostring1(v,n); |
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27 | } |
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28 | public: |
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29 | stopos_key(); |
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30 | stopos_key(const std::string &s); |
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31 | void increment(void); |
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32 | std::string str(void) const; |
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33 | void impossible(); |
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34 | bool operator==(const stopos_key &k) const; |
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35 | bool operator!=(const stopos_key &k) const; |
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36 | |
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37 | // to assign an unsigned integer value to a key |
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38 | template <typename T> void set(const T k) |
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39 | { |
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40 | this->value = ""; |
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41 | this->tostring(this->value,k); |
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42 | return; |
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43 | } |
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44 | |
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45 | // to get the unsigned integer value from a key |
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46 | template <typename T> T get() const |
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47 | { |
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48 | T r = 0; |
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49 | |
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50 | for (unsigned int i=0; i<this->value.size(); i++) |
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51 | r = this->base*r + this->value[i]-this->firstchar; |
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52 | |
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53 | return r; |
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54 | } |
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55 | }; |
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56 | #endif |
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