cutoff.hpp
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00042 namespace Gecode { namespace Search {
00043
00044 forceinline
00045 Cutoff::Cutoff(void) {}
00046 forceinline
00047 Cutoff::~Cutoff(void) {}
00048
00049
00050 forceinline
00051 CutoffConstant::CutoffConstant(unsigned long int c0)
00052 : c(c0) {}
00053
00054
00055 forceinline
00056 CutoffLinear::CutoffLinear(unsigned long int s)
00057 : scale(s), n(0) {}
00058
00059
00060 forceinline
00061 CutoffLuby::CutoffLuby(unsigned long int scale0)
00062 : i(1U), scale(scale0) {}
00063 forceinline unsigned long int
00064 CutoffLuby::log(unsigned long int i) {
00065 if (i == 1U)
00066 return 0U;
00067 unsigned long int exp = 0U;
00068 while ( (i >> (++exp)) > 1U ) {}
00069 return exp;
00070 }
00071 forceinline unsigned long int
00072 CutoffLuby::luby(unsigned long int i) {
00073 while (true) {
00074 if (i <= n_start)
00075 return start[i-1];
00076 unsigned long int l = log(i);
00077 if (i == (1U<<(l+1))-1)
00078 return 1UL<<l;
00079 i=i-(1U<<l)+1;
00080 }
00081 GECODE_NEVER;
00082 return 0;
00083 }
00084
00085
00086 forceinline
00087 CutoffGeometric::CutoffGeometric(unsigned long int scale0, double base0)
00088 : n(1.0), scale(static_cast<double>(scale0)), base(base0) {}
00089
00090
00091 forceinline
00092 CutoffRandom::CutoffRandom(unsigned int seed,
00093 unsigned long int min0,
00094 unsigned long int max0,
00095 unsigned long int n0)
00096 : rnd(seed), min(min0), n(n0 == 0 ? (max0-min+1U) : n0),
00097 step(std::max(1UL,
00098 static_cast<unsigned long int>((max0-min0+1U)/n))) {
00099 cur = ++(*this);
00100 }
00101
00102
00103 forceinline
00104 CutoffAppend::CutoffAppend(Cutoff* d1, unsigned long int n0, Cutoff* d2)
00105 : c1(d1), c2(d2), n(n0) {}
00106 forceinline
00107 CutoffAppend::~CutoffAppend(void) {
00108 delete c1; delete c2;
00109 }
00110
00111
00112 forceinline
00113 CutoffMerge::CutoffMerge(Cutoff* d1, Cutoff* d2)
00114 : c1(d1), c2(d2) {}
00115 forceinline
00116 CutoffMerge::~CutoffMerge(void) {
00117 delete c1; delete c2;
00118 }
00119
00120
00121 forceinline
00122 CutoffRepeat::CutoffRepeat(Cutoff* c1, unsigned long int n0)
00123 : c(c1), i(0), n(n0) {
00124 cutoff = (*c)();
00125 }
00126 forceinline
00127 CutoffRepeat::~CutoffRepeat(void) {
00128 delete c;
00129 }
00130
00131 }}
00132
00133