[493c477] | 1 | /* emacs edit mode for this file is -*- C++ -*- */ |
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[2dd068] | 2 | |
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[16f511] | 3 | #ifdef HAVE_CONFIG_H |
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[e4fe2b] | 4 | #include "config.h" |
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[16f511] | 5 | #endif /* HAVE_CONFIG_H */ |
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[ab4548f] | 6 | |
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[650f2d8] | 7 | #include "cf_assert.h" |
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[ab4548f] | 8 | |
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[2dd068] | 9 | #include "cf_defs.h" |
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| 10 | #include "cf_generator.h" |
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| 11 | #include "imm.h" |
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| 12 | #include "gfops.h" |
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| 13 | #include "ffops.h" |
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| 14 | |
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| 15 | bool FFGenerator::hasItems() const |
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| 16 | { |
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| 17 | return current < ff_prime; |
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| 18 | } |
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| 19 | |
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| 20 | CanonicalForm FFGenerator::item() const |
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| 21 | { |
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| 22 | ASSERT( current < ff_prime, "no more items" ); |
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| 23 | return CanonicalForm( int2imm_p( current ) ); |
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| 24 | } |
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| 25 | |
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| 26 | void FFGenerator::next() |
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| 27 | { |
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| 28 | ASSERT( current < ff_prime, "no more items" ); |
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| 29 | current++; |
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| 30 | } |
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| 31 | |
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[99ffd8] | 32 | CFGenerator * FFGenerator::clone () const |
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| 33 | { |
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| 34 | return new FFGenerator(); |
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| 35 | } |
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[2dd068] | 36 | |
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| 37 | GFGenerator::GFGenerator() |
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| 38 | { |
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| 39 | current = gf_zero(); |
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| 40 | } |
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| 41 | |
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| 42 | bool GFGenerator::hasItems() const |
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| 43 | { |
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| 44 | return ( current != gf_q + 1 ); |
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| 45 | } |
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| 46 | |
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| 47 | void GFGenerator::reset() |
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| 48 | { |
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| 49 | current = gf_zero(); |
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| 50 | } |
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| 51 | |
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| 52 | CanonicalForm GFGenerator::item() const |
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| 53 | { |
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| 54 | ASSERT( current != gf_q + 1, "no more items" ); |
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| 55 | return CanonicalForm( int2imm_gf( current ) ); |
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| 56 | } |
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| 57 | |
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| 58 | void GFGenerator::next() |
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| 59 | { |
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| 60 | ASSERT( current != gf_q + 1, "no more items" ); |
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| 61 | if ( gf_iszero( current ) ) |
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[806c18] | 62 | current = 0; |
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[2dd068] | 63 | else if ( current == gf_q1 - 1 ) |
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[806c18] | 64 | current = gf_q + 1; |
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[2dd068] | 65 | else |
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[806c18] | 66 | current++; |
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[2dd068] | 67 | } |
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| 68 | |
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[99ffd8] | 69 | CFGenerator * GFGenerator::clone () const |
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| 70 | { |
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| 71 | return new GFGenerator(); |
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| 72 | } |
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| 73 | |
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[2dd068] | 74 | AlgExtGenerator::AlgExtGenerator() |
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| 75 | { |
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| 76 | ASSERT( 0, "not a valid generator" ); |
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| 77 | } |
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| 78 | |
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| 79 | AlgExtGenerator::AlgExtGenerator( const AlgExtGenerator & ) |
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| 80 | { |
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| 81 | ASSERT( 0, "not a valid generator" ); |
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[ab4548f] | 82 | } |
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[2dd068] | 83 | |
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| 84 | AlgExtGenerator& AlgExtGenerator::operator= ( const AlgExtGenerator & ) |
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| 85 | { |
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| 86 | ASSERT( 0, "not a valid generator" ); |
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| 87 | return *this; |
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| 88 | } |
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| 89 | |
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| 90 | AlgExtGenerator::AlgExtGenerator( const Variable & a ) |
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| 91 | { |
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| 92 | ASSERT( a.level() < 0, "not an algebraic extension" ); |
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| 93 | ASSERT( getCharacteristic() > 0, "not a finite field" ); |
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| 94 | algext = a; |
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| 95 | n = degree( getMipo( a ) ); |
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[b96e07] | 96 | if ( getGFDegree() > 1 ) |
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| 97 | { |
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| 98 | gensg = new GFGenerator * [n]; |
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| 99 | for ( int i = 0; i < n; i++ ) |
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| 100 | gensg[i] = new GFGenerator(); |
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| 101 | } |
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| 102 | else |
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| 103 | { |
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| 104 | gensf = new FFGenerator * [n]; |
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| 105 | for ( int i = 0; i < n; i++ ) |
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| 106 | gensf[i] = new FFGenerator(); |
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| 107 | } |
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[2dd068] | 108 | nomoreitems = false; |
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| 109 | } |
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| 110 | |
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| 111 | AlgExtGenerator::~AlgExtGenerator() |
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| 112 | { |
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[b96e07] | 113 | if ( getGFDegree() > 1 ) |
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| 114 | { |
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| 115 | for ( int i = 0; i < n; i++ ) |
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| 116 | delete gensg[i]; |
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| 117 | delete [] gensg; |
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| 118 | } |
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| 119 | else |
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| 120 | { |
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| 121 | for ( int i = 0; i < n; i++ ) |
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| 122 | delete gensf[i]; |
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| 123 | delete [] gensf; |
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| 124 | } |
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[2dd068] | 125 | } |
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| 126 | |
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| 127 | void AlgExtGenerator::reset() |
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| 128 | { |
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[b96e07] | 129 | if ( getGFDegree() > 1 ) |
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| 130 | { |
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| 131 | for ( int i = 0; i < n; i++ ) |
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| 132 | gensg[i]->reset(); |
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| 133 | } |
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| 134 | else |
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| 135 | { |
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| 136 | for ( int i = 0; i < n; i++ ) |
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| 137 | gensf[i]->reset(); |
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| 138 | } |
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[2dd068] | 139 | nomoreitems = false; |
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| 140 | } |
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| 141 | |
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| 142 | CanonicalForm AlgExtGenerator::item() const |
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| 143 | { |
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| 144 | ASSERT( ! nomoreitems, "no more items" ); |
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| 145 | CanonicalForm result = 0; |
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[b96e07] | 146 | if ( getGFDegree() > 1 ) |
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| 147 | { |
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| 148 | for ( int i = 0; i < n; i++ ) |
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[806c18] | 149 | result += power( algext, i ) * gensg[i]->item(); |
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[b96e07] | 150 | } |
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| 151 | else |
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| 152 | { |
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| 153 | for ( int i = 0; i < n; i++ ) |
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[806c18] | 154 | result += power( algext, i ) * gensf[i]->item(); |
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[b96e07] | 155 | } |
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[2dd068] | 156 | return result; |
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| 157 | } |
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| 158 | |
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| 159 | void AlgExtGenerator::next() |
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| 160 | { |
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| 161 | ASSERT( ! nomoreitems, "no more items" ); |
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| 162 | int i = 0; |
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| 163 | bool stop = false; |
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[b96e07] | 164 | if ( getGFDegree() > 1 ) |
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| 165 | { |
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| 166 | while ( ! stop && i < n ) |
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| 167 | { |
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[806c18] | 168 | gensg[i]->next(); |
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| 169 | if ( ! gensg[i]->hasItems() ) |
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[b96e07] | 170 | { |
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[806c18] | 171 | gensg[i]->reset(); |
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| 172 | i++; |
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| 173 | } |
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| 174 | else |
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| 175 | stop = true; |
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[b96e07] | 176 | } |
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| 177 | } |
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| 178 | else |
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| 179 | { |
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| 180 | while ( ! stop && i < n ) |
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| 181 | { |
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[806c18] | 182 | gensf[i]->next(); |
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| 183 | if ( ! gensf[i]->hasItems() ) |
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[b96e07] | 184 | { |
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[806c18] | 185 | gensf[i]->reset(); |
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| 186 | i++; |
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| 187 | } |
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| 188 | else |
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| 189 | stop = true; |
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[b96e07] | 190 | } |
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[2dd068] | 191 | } |
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| 192 | if ( ! stop ) |
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[806c18] | 193 | nomoreitems = true; |
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[2dd068] | 194 | } |
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| 195 | |
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[99ffd8] | 196 | CFGenerator * AlgExtGenerator::clone () const |
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| 197 | { |
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| 198 | return new AlgExtGenerator(algext); |
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| 199 | } |
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| 200 | |
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[2dd068] | 201 | CFGenerator * CFGenFactory::generate() |
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| 202 | { |
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| 203 | ASSERT( getCharacteristic() > 0, "not a finite field" ); |
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| 204 | if ( getGFDegree() > 1 ) |
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[806c18] | 205 | return new GFGenerator(); |
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[2dd068] | 206 | else |
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[806c18] | 207 | return new FFGenerator(); |
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[2dd068] | 208 | } |
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