# | Line 122 | Line 122 | class BitSet { | |
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122 | BitSet& operator&= (const BitSet &bs) { andOperator (bs); return *this; } | |
123 | BitSet& operator|= (const BitSet &bs) { orOperator (bs); return *this; } | |
124 | BitSet& operator^= (const BitSet &bs) { xorOperator (bs); return *this; } | |
125 | + | BitSet& operator-= (const BitSet &bs) { |
126 | + | BitSet tmp = *this ^ bs; |
127 | + | *this &= tmp; |
128 | + | return *this; |
129 | + | } |
130 | + | |
131 | bool operator[] (int bitIndex) const { return bitset_[bitIndex]; } | |
132 | friend BitSet operator| (const BitSet& bs1, const BitSet& bs2); | |
133 | friend BitSet operator& (const BitSet& bs1, const BitSet& bs2); | |
134 | friend BitSet operator^ (const BitSet& bs1, const BitSet& bs2); | |
135 | + | friend BitSet operator- (const BitSet& bs1, const BitSet& bs2); |
136 | + | |
137 | friend bool operator== (const BitSet & bs1, const BitSet &bs2); | |
138 | ||
139 | friend std::istream& operator>> ( std::istream&, const BitSet& bs); |
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