1 | /* emacs edit mode for this file is -*- C++ -*- */ |
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2 | /* $Id: cf_generator.h,v 1.3 2004-12-10 10:14:46 Singular Exp $ */ |
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3 | |
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4 | #ifndef INCL_CF_GENERATOR_H |
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5 | #define INCL_CF_GENERATOR_H |
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6 | |
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7 | #include <config.h> |
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8 | |
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9 | #include "canonicalform.h" |
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10 | |
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11 | /*BEGINPUBLIC*/ |
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12 | |
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13 | class CFGenerator |
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14 | { |
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15 | public: |
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16 | CFGenerator() {} |
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17 | virtual ~CFGenerator() {} |
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18 | virtual bool hasItems() const { return false; } |
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19 | virtual void reset() {}; |
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20 | virtual CanonicalForm item() const { return 0; } |
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21 | virtual void next() {}; |
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22 | }; |
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23 | |
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24 | class FFGenerator : public CFGenerator |
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25 | { |
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26 | private: |
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27 | int current; |
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28 | public: |
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29 | FFGenerator() : current(0) {} |
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30 | ~FFGenerator() {} |
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31 | bool hasItems() const; |
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32 | void reset() { current = 0; } |
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33 | CanonicalForm item() const; |
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34 | void next(); |
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35 | void operator++ () { next(); } |
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36 | void operator++ ( int ) { next(); } |
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37 | }; |
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38 | |
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39 | class GFGenerator : public CFGenerator |
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40 | { |
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41 | private: |
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42 | int current; |
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43 | public: |
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44 | GFGenerator(); |
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45 | ~GFGenerator() {} |
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46 | bool hasItems() const; |
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47 | void reset(); |
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48 | CanonicalForm item() const; |
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49 | void next(); |
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50 | void operator++ () { next(); } |
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51 | void operator++ ( int ) { next(); } |
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52 | }; |
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53 | |
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54 | class AlgExtGenerator //??? : public CFGenerator |
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55 | { |
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56 | private: |
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57 | Variable algext; |
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58 | FFGenerator **gensf; |
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59 | GFGenerator **gensg; |
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60 | int n; |
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61 | bool nomoreitems; |
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62 | AlgExtGenerator(); |
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63 | AlgExtGenerator( const AlgExtGenerator & ); |
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64 | AlgExtGenerator& operator= ( const AlgExtGenerator & ); |
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65 | public: |
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66 | AlgExtGenerator( const Variable & a ); |
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67 | ~AlgExtGenerator(); |
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68 | |
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69 | bool hasItems() const { return ! nomoreitems; } |
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70 | void reset(); |
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71 | CanonicalForm item() const; |
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72 | void next(); |
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73 | void operator++ () { next(); } |
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74 | void operator++ ( int ) { next(); } |
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75 | }; |
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76 | |
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77 | class CFGenFactory |
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78 | { |
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79 | public: |
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80 | static CFGenerator* generate(); |
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81 | }; |
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82 | |
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83 | /*ENDPUBLIC*/ |
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84 | |
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85 | #endif /* ! INCL_CF_GENERATOR_H */ |
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