1 | #ifndef RESOLVEXPR_COST_H |
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2 | #define RESOLVEXPR_COST_H |
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3 | |
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4 | #include <iostream> |
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5 | |
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6 | namespace ResolvExpr { |
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7 | class Cost { |
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8 | public: |
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9 | Cost(); |
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10 | Cost( int unsafe, int poly, int safe ); |
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11 | |
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12 | void incUnsafe( int inc = 1 ); |
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13 | void incPoly( int inc = 1 ); |
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14 | void incSafe( int inc = 1 ); |
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15 | |
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16 | Cost operator+( const Cost &other ) const; |
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17 | Cost operator-( const Cost &other ) const; |
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18 | Cost &operator+=( const Cost &other ); |
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19 | bool operator<( const Cost &other ) const; |
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20 | bool operator==( const Cost &other ) const; |
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21 | bool operator!=( const Cost &other ) const; |
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22 | friend std::ostream &operator<<( std::ostream &os, const Cost &cost ); |
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23 | |
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24 | static const Cost zero; |
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25 | static const Cost infinity; |
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26 | private: |
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27 | int compare( const Cost &other ) const; |
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28 | |
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29 | int unsafe; |
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30 | int poly; |
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31 | int safe; |
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32 | }; |
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33 | |
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34 | inline Cost::Cost() : unsafe( 0 ), poly( 0 ), safe( 0 ) {} |
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35 | |
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36 | inline Cost::Cost( int unsafe, int poly, int safe ) : unsafe( unsafe ), poly( poly ), safe( safe ) {} |
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37 | |
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38 | inline void |
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39 | Cost::incUnsafe( int inc ) { |
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40 | unsafe += inc; |
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41 | } |
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42 | |
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43 | inline void |
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44 | Cost::incPoly( int inc ) { |
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45 | unsafe += inc; |
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46 | } |
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47 | |
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48 | inline void |
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49 | Cost::incSafe( int inc ) { |
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50 | unsafe += inc; |
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51 | } |
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52 | |
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53 | inline Cost Cost::operator+( const Cost &other ) const { |
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54 | return Cost( unsafe + other.unsafe, poly + other.poly, safe + other.safe ); |
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55 | } |
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56 | |
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57 | inline Cost Cost::operator-( const Cost &other ) const { |
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58 | return Cost( unsafe - other.unsafe, poly - other.poly, safe - other.safe ); |
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59 | } |
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60 | |
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61 | inline Cost &Cost::operator+=( const Cost &other ) { |
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62 | unsafe += other.unsafe; |
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63 | poly += other.poly; |
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64 | safe += other.safe; |
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65 | return *this; |
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66 | } |
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67 | |
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68 | inline bool Cost::operator<( const Cost &other ) const { |
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69 | if ( *this == infinity ) return false; |
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70 | if ( other == infinity ) return true; |
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71 | if ( unsafe > other.unsafe ) { |
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72 | return false; |
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73 | } else if ( unsafe < other.unsafe ) { |
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74 | return true; |
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75 | } else if ( poly > other.poly ) { |
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76 | return false; |
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77 | } else if ( poly < other.poly ) { |
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78 | return true; |
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79 | } else if ( safe > other.safe ) { |
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80 | return false; |
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81 | } else if ( safe < other.safe ) { |
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82 | return true; |
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83 | } else { |
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84 | return false; |
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85 | } |
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86 | } |
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87 | |
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88 | inline bool Cost::operator==( const Cost &other ) const { |
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89 | return unsafe == other.unsafe |
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90 | && poly == other.poly |
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91 | && safe == other.safe; |
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92 | } |
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93 | |
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94 | inline bool Cost::operator!=( const Cost &other ) const { |
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95 | return !( *this == other ); |
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96 | } |
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97 | |
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98 | inline std::ostream &operator<<( std::ostream &os, const Cost &cost ) { |
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99 | os << "( " << cost.unsafe << ", " << cost.poly << ", " << cost.safe << " )"; |
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100 | return os; |
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101 | } |
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102 | } // namespace ResolvExpr |
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103 | |
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104 | #endif // RESOLVEXPR_COST_H |
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