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hamming.cpp
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37 
38 #include <gecode/driver.hh>
39 #include <gecode/int.hh>
40 #include <gecode/minimodel.hh>
41 #include <gecode/set.hh>
42 
43 using namespace Gecode;
44 
50 class HammingOptions : public Options {
51 private:
55  Driver::UnsignedIntOption _distance;
58 
59 public:
61  HammingOptions(const char* s, unsigned int bits0,
62  unsigned int distance0, unsigned int size0)
63  : Options(s),
64  _bits("-bits","word size in bits",bits0),
65  _distance("-distance","minimum distance",distance0),
66  _size("-size","number of symbols",size0) {
67  add(_bits); add(_distance); add(_size);
68  }
69 
71  unsigned int bits(void) const { return _bits.value(); }
73  unsigned int distance(void) const { return _distance.value(); }
75  unsigned int size(void) const { return _size.value(); }
76 
77 };
78 
90 class Hamming : public Script {
91 private:
93  SetVarArray x;
94 public:
97  x(*this,opt.size(),IntSet::empty,1,opt.bits()) {
98  SetVarArgs cx(x.size());
99  for (int i=x.size(); i--;)
100  cx[i] = expr(*this, -x[i]);
101 
102  for (int i=0; i<x.size(); i++)
103  for (int j=i+1; j<x.size(); j++)
104  rel(*this,
105  cardinality(x[j] & cx[i]) +
106  cardinality(x[i] & cx[j]) >= opt.distance());
107 
108  branch(*this, x, SET_VAR_NONE(), SET_VAL_MIN_INC());
109  }
110 
112  virtual void
113  print(std::ostream& os) const {
114  for (int i=0; i<x.size(); i++) {
115  os << "\t[" << i << "] = " << x[i] << std::endl;
116  }
117  }
118 
120  Hamming(bool share, Hamming& s) : Script(share,s) {
121  x.update(*this, share, s.x);
122  }
124  virtual Space*
125  copy(bool share) {
126  return new Hamming(share,*this);
127  }
128 
129 };
130 
134 int
135 main(int argc, char* argv[]) {
136  HammingOptions opt("Hamming",20,3,32);
137  opt.parse(argc,argv);
138  Script::run<Hamming,DFS,HammingOptions>(opt);
139  return 0;
140 }
141 
142 
143 // STATISTICS: example-any
144 
unsigned int size(void) const
Return number of symbols.
Definition: hamming.cpp:75
SetVarBranch SET_VAR_NONE(void)
Select first unassigned variable.
Definition: var.hpp:91
Options for Hamming problems
Definition: hamming.cpp:50
SetValBranch SET_VAL_MIN_INC(void)
Include smallest element.
Definition: val.hpp:59
Computation spaces.
Definition: core.hpp:1362
Parametric base-class for scripts.
Definition: driver.hh:622
void value(unsigned int v)
Set default value to v.
Definition: options.hpp:95
void update(Space &, bool share, VarArray< Var > &a)
Update array to be a clone of array a.
Definition: array.hpp:1072
Gecode::IntArgs i(4, 1, 2, 3, 4)
Options opt
The options.
Definition: test.cpp:101
unsigned int size(I &i)
Size of all ranges of range iterator i.
Unsigned integer option.
Definition: driver.hh:229
Integer sets.
Definition: int.hh:171
Hamming(const HammingOptions &opt)
Actual model.
Definition: hamming.cpp:96
LinIntExpr cardinality(const SetExpr &e)
Cardinality of set expression.
Definition: set-expr.cpp:815
void parse(int &argc, char *argv[])
Parse options from arguments argv (number is argc)
Definition: options.cpp:331
unsigned int distance(void) const
Return minimum distance.
Definition: hamming.cpp:73
Passing set variables.
Definition: set.hh:490
BoolVar expr(Home home, const BoolExpr &e, IntConLevel icl)
Post Boolean expression and return its value.
Definition: bool-expr.cpp:632
Node * x
Pointer to corresponding Boolean expression node.
Definition: bool-expr.cpp:253
virtual Space * copy(bool share)
Copy during cloning.
Definition: hamming.cpp:125
int main(int argc, char *argv[])
Main-function.
Definition: hamming.cpp:135
void rel(Home home, FloatVar x0, FloatRelType frt, FloatVal n)
Propagates .
Definition: rel.cpp:47
Set variable array
Definition: set.hh:571
Gecode toplevel namespace
BrancherHandle branch(Home home, const FloatVarArgs &x, FloatVarBranch vars, FloatValBranch vals, FloatBranchFilter bf, FloatVarValPrint vvp)
Branch over x with variable selection vars and value selection vals.
Definition: branch.cpp:43
unsigned int bits(void) const
Return number of bits.
Definition: hamming.cpp:71
int size(void) const
Return size of array (number of elements)
Definition: array.hpp:985
Options for scripts
Definition: driver.hh:326
Hamming(bool share, Hamming &s)
Constructor for copying s.
Definition: hamming.cpp:120
virtual void print(std::ostream &os) const
Print solution.
Definition: hamming.cpp:113
Example: Generating Hamming codes
Definition: hamming.cpp:90
HammingOptions(const char *s, unsigned int bits0, unsigned int distance0, unsigned int size0)
Initialize options for example with name s.
Definition: hamming.cpp:61