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[9] | 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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