[493c477] | 1 | /* emacs edit mode for this file is -*- C++ -*- */ |
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[2dd068] | 2 | |
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[e4fe2b] | 3 | #include "config.h" |
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[ab4548f] | 4 | |
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[650f2d8] | 5 | #include "cf_assert.h" |
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[ab4548f] | 6 | |
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[2dd068] | 7 | #include "cf_defs.h" |
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| 8 | #include "cf_generator.h" |
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| 9 | #include "imm.h" |
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| 10 | #include "gfops.h" |
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| 11 | #include "ffops.h" |
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| 12 | |
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| 13 | bool FFGenerator::hasItems() const |
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| 14 | { |
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| 15 | return current < ff_prime; |
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| 16 | } |
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| 17 | |
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| 18 | CanonicalForm FFGenerator::item() const |
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| 19 | { |
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| 20 | ASSERT( current < ff_prime, "no more items" ); |
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| 21 | return CanonicalForm( int2imm_p( current ) ); |
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| 22 | } |
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| 23 | |
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| 24 | void FFGenerator::next() |
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| 25 | { |
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| 26 | ASSERT( current < ff_prime, "no more items" ); |
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| 27 | current++; |
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| 28 | } |
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| 29 | |
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[99ffd8] | 30 | CFGenerator * FFGenerator::clone () const |
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| 31 | { |
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| 32 | return new FFGenerator(); |
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| 33 | } |
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[2dd068] | 34 | |
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| 35 | GFGenerator::GFGenerator() |
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| 36 | { |
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| 37 | current = gf_zero(); |
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| 38 | } |
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| 39 | |
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| 40 | bool GFGenerator::hasItems() const |
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| 41 | { |
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| 42 | return ( current != gf_q + 1 ); |
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| 43 | } |
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| 44 | |
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| 45 | void GFGenerator::reset() |
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| 46 | { |
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| 47 | current = gf_zero(); |
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| 48 | } |
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| 49 | |
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| 50 | CanonicalForm GFGenerator::item() const |
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| 51 | { |
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| 52 | ASSERT( current != gf_q + 1, "no more items" ); |
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| 53 | return CanonicalForm( int2imm_gf( current ) ); |
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| 54 | } |
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| 55 | |
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| 56 | void GFGenerator::next() |
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| 57 | { |
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| 58 | ASSERT( current != gf_q + 1, "no more items" ); |
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| 59 | if ( gf_iszero( current ) ) |
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[806c18] | 60 | current = 0; |
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[2dd068] | 61 | else if ( current == gf_q1 - 1 ) |
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[806c18] | 62 | current = gf_q + 1; |
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[2dd068] | 63 | else |
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[806c18] | 64 | current++; |
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[2dd068] | 65 | } |
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| 66 | |
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[99ffd8] | 67 | CFGenerator * GFGenerator::clone () const |
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| 68 | { |
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| 69 | return new GFGenerator(); |
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| 70 | } |
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| 71 | |
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[2dd068] | 72 | AlgExtGenerator::AlgExtGenerator() |
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| 73 | { |
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| 74 | ASSERT( 0, "not a valid generator" ); |
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| 75 | } |
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| 76 | |
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| 77 | AlgExtGenerator::AlgExtGenerator( const AlgExtGenerator & ) |
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| 78 | { |
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| 79 | ASSERT( 0, "not a valid generator" ); |
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[ab4548f] | 80 | } |
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[2dd068] | 81 | |
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| 82 | AlgExtGenerator& AlgExtGenerator::operator= ( const AlgExtGenerator & ) |
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| 83 | { |
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| 84 | ASSERT( 0, "not a valid generator" ); |
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| 85 | return *this; |
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| 86 | } |
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| 87 | |
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| 88 | AlgExtGenerator::AlgExtGenerator( const Variable & a ) |
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| 89 | { |
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| 90 | ASSERT( a.level() < 0, "not an algebraic extension" ); |
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| 91 | ASSERT( getCharacteristic() > 0, "not a finite field" ); |
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| 92 | algext = a; |
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| 93 | n = degree( getMipo( a ) ); |
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[b96e07] | 94 | if ( getGFDegree() > 1 ) |
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| 95 | { |
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| 96 | gensg = new GFGenerator * [n]; |
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| 97 | for ( int i = 0; i < n; i++ ) |
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| 98 | gensg[i] = new GFGenerator(); |
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| 99 | } |
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| 100 | else |
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| 101 | { |
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| 102 | gensf = new FFGenerator * [n]; |
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| 103 | for ( int i = 0; i < n; i++ ) |
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| 104 | gensf[i] = new FFGenerator(); |
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| 105 | } |
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[2dd068] | 106 | nomoreitems = false; |
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| 107 | } |
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| 108 | |
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| 109 | AlgExtGenerator::~AlgExtGenerator() |
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| 110 | { |
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[b96e07] | 111 | if ( getGFDegree() > 1 ) |
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| 112 | { |
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| 113 | for ( int i = 0; i < n; i++ ) |
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| 114 | delete gensg[i]; |
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| 115 | delete [] gensg; |
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| 116 | } |
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| 117 | else |
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| 118 | { |
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| 119 | for ( int i = 0; i < n; i++ ) |
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| 120 | delete gensf[i]; |
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| 121 | delete [] gensf; |
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| 122 | } |
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[2dd068] | 123 | } |
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| 124 | |
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| 125 | void AlgExtGenerator::reset() |
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| 126 | { |
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[b96e07] | 127 | if ( getGFDegree() > 1 ) |
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| 128 | { |
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| 129 | for ( int i = 0; i < n; i++ ) |
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| 130 | gensg[i]->reset(); |
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| 131 | } |
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| 132 | else |
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| 133 | { |
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| 134 | for ( int i = 0; i < n; i++ ) |
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| 135 | gensf[i]->reset(); |
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| 136 | } |
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[2dd068] | 137 | nomoreitems = false; |
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| 138 | } |
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| 139 | |
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| 140 | CanonicalForm AlgExtGenerator::item() const |
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| 141 | { |
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| 142 | ASSERT( ! nomoreitems, "no more items" ); |
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| 143 | CanonicalForm result = 0; |
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[b96e07] | 144 | if ( getGFDegree() > 1 ) |
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| 145 | { |
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| 146 | for ( int i = 0; i < n; i++ ) |
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[806c18] | 147 | result += power( algext, i ) * gensg[i]->item(); |
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[b96e07] | 148 | } |
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| 149 | else |
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| 150 | { |
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| 151 | for ( int i = 0; i < n; i++ ) |
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[806c18] | 152 | result += power( algext, i ) * gensf[i]->item(); |
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[b96e07] | 153 | } |
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[2dd068] | 154 | return result; |
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| 155 | } |
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| 156 | |
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| 157 | void AlgExtGenerator::next() |
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| 158 | { |
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| 159 | ASSERT( ! nomoreitems, "no more items" ); |
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| 160 | int i = 0; |
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| 161 | bool stop = false; |
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[b96e07] | 162 | if ( getGFDegree() > 1 ) |
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| 163 | { |
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| 164 | while ( ! stop && i < n ) |
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| 165 | { |
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[806c18] | 166 | gensg[i]->next(); |
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| 167 | if ( ! gensg[i]->hasItems() ) |
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[b96e07] | 168 | { |
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[806c18] | 169 | gensg[i]->reset(); |
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| 170 | i++; |
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| 171 | } |
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| 172 | else |
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| 173 | stop = true; |
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[b96e07] | 174 | } |
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| 175 | } |
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| 176 | else |
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| 177 | { |
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| 178 | while ( ! stop && i < n ) |
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| 179 | { |
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[806c18] | 180 | gensf[i]->next(); |
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| 181 | if ( ! gensf[i]->hasItems() ) |
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[b96e07] | 182 | { |
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[806c18] | 183 | gensf[i]->reset(); |
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| 184 | i++; |
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| 185 | } |
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| 186 | else |
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| 187 | stop = true; |
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[b96e07] | 188 | } |
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[2dd068] | 189 | } |
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| 190 | if ( ! stop ) |
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[806c18] | 191 | nomoreitems = true; |
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[2dd068] | 192 | } |
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| 193 | |
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[99ffd8] | 194 | CFGenerator * AlgExtGenerator::clone () const |
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| 195 | { |
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| 196 | return new AlgExtGenerator(algext); |
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| 197 | } |
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| 198 | |
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[2dd068] | 199 | CFGenerator * CFGenFactory::generate() |
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| 200 | { |
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| 201 | ASSERT( getCharacteristic() > 0, "not a finite field" ); |
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| 202 | if ( getGFDegree() > 1 ) |
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[806c18] | 203 | return new GFGenerator(); |
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[2dd068] | 204 | else |
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[806c18] | 205 | return new FFGenerator(); |
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[2dd068] | 206 | } |
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