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25 // 25 //
26 // G4Pow class implemenation << 26 // $Id$
27 // 27 //
28 // Author: Vladimir Ivanchenko, 23.05.2009 << 28 // -------------------------------------------------------------------
29 // Revisions: << 29 //
30 // - 23.03.2018, M.Novak: increased accuracy o << 30 // GEANT4 Class file
31 // [1/4,4] interval by << 31 //
32 // ------------------------------------------- << 32 //
>> 33 // File name: G4Pow
>> 34 //
>> 35 // Author: Vladimir Ivanchenko
>> 36 //
>> 37 // Creation date: 23.05.2009
>> 38 //
>> 39 // Modifications:
>> 40 // 08.01.2011 V.Ivanchenko extended maxZ from 256 to 512
>> 41 //
>> 42 // -------------------------------------------------------------------
33 43
34 #include "G4Pow.hh" 44 #include "G4Pow.hh"
35 #include "G4Threading.hh" <<
36 45
37 G4Pow* G4Pow::fpInstance = nullptr; << 46 G4Pow* G4Pow::fInstance = 0;
38 47
39 // ------------------------------------------- 48 // -------------------------------------------------------------------
40 49
41 G4Pow* G4Pow::GetInstance() 50 G4Pow* G4Pow::GetInstance()
42 { 51 {
43 if(fpInstance == nullptr) << 52 if (fInstance == 0)
44 { 53 {
45 static G4Pow geant4pow; << 54 static G4Pow manager;
46 fpInstance = &geant4pow; << 55 fInstance = &manager;
47 } 56 }
48 return fpInstance; << 57 return fInstance;
49 } 58 }
50 59
51 // ------------------------------------------- 60 // -------------------------------------------------------------------
52 61
53 G4Pow::G4Pow() 62 G4Pow::G4Pow()
54 { 63 {
55 #ifdef G4MULTITHREADED << 64 const G4int maxZ = 512;
56 if(G4Threading::IsWorkerThread()) << 65 const G4int maxZfact = 170;
57 { <<
58 G4Exception("G4Pow::G4Pow()", "InvalidSetu <<
59 "Attempt to instantiate G4Pow <<
60 } <<
61 #endif <<
62 const G4int maxZ = 512; <<
63 const G4int maxZfact = 170; <<
64 const G4int numLowA = 17; <<
65 <<
66 maxA = -0.6 + maxZ; <<
67 maxLowA = 4.0; <<
68 maxA2 = 1.25 + max2 * 0.2; <<
69 maxAexp = -0.76 + maxZfact * 0.5; <<
70 <<
71 ener.resize(max2 + 1, 1.0); <<
72 logen.resize(max2 + 1, 0.0); <<
73 lz2.resize(max2 + 1, 0.0); <<
74 pz13.resize(maxZ, 0.0); <<
75 lowa13.resize(numLowA, 0.0); <<
76 lz.resize(maxZ, 0.0); <<
77 fexp.resize(maxZfact, 0.0); <<
78 fact.resize(maxZfact, 0.0); <<
79 logfact.resize(maxZ, 0.0); <<
80 66
81 G4double f = 1.0; << 67 pz13.resize(maxZ,0.0);
82 G4double logf = 0.0; << 68 lz.resize(maxZ,0.0);
83 fact[0] = 1.0; << 69 fact.resize(maxZfact,0.0);
84 fexp[0] = 1.0; << 70 logfact.resize(maxZ,0.0);
85 71
86 for(G4int i = 1; i <= max2; ++i) << 72 onethird = 1.0/3.0;
87 { << 73 G4double f = 1.0;
88 ener[i] = powN(500., i); << 74 G4double logf = 0.0;
89 logen[i] = G4Log(ener[i]); << 75 fact[0] = 1.0;
90 lz2[i] = G4Log(1.0 + i * 0.2); <<
91 } <<
92 76
93 for(G4int i = 1; i < maxZ; ++i) << 77 for(G4int i=1; i<maxZ; ++i)
94 { 78 {
95 auto x = G4double(i); << 79 G4double x = G4double(i);
96 pz13[i] = std::pow(x, onethird); << 80 pz13[i] = std::pow(x,onethird);
97 lz[i] = G4Log(x); << 81 lz[i] = std::log(x);
98 if(i < maxZfact) << 82 if(i < maxZfact) {
99 { << 83 f *= x;
100 f *= x; <<
101 fact[i] = f; 84 fact[i] = f;
102 fexp[i] = G4Exp(0.5 * i); <<
103 } 85 }
104 logf += lz[i]; 86 logf += lz[i];
105 logfact[i] = logf; 87 logfact[i] = logf;
106 } 88 }
107 <<
108 for(G4int i = 4; i < numLowA; ++i) <<
109 { <<
110 lowa13[i] = std::pow(0.25 * i, onethird); <<
111 } <<
112 } <<
113 <<
114 // ------------------------------------------- <<
115 <<
116 G4double G4Pow::A13(G4double A) const <<
117 { <<
118 G4double res = 0.; <<
119 if(A > 0.) <<
120 { <<
121 const bool invert = (A < 1.); <<
122 const G4double a = invert ? 1. / A : A; <<
123 res = (a < maxLowA) ? A13Low <<
124 } <<
125 return res; <<
126 } <<
127 <<
128 // ------------------------------------------- <<
129 <<
130 G4double G4Pow::A13High(const G4double a, cons <<
131 { <<
132 G4double res; <<
133 if(a < maxA) <<
134 { <<
135 const auto i = static_cast<G4int>(a + <<
136 const G4double x = (a / i - 1.) * onethird <<
137 res = pz13[i] * (1. + x - x * <<
138 } <<
139 else <<
140 { <<
141 res = G4Exp(G4Log(a) * onethird); <<
142 } <<
143 res = invert ? 1. / res : res; <<
144 return res; <<
145 } 89 }
146 90
147 // ------------------------------------------- 91 // -------------------------------------------------------------------
148 92
149 G4double G4Pow::A13Low(const G4double a, const << 93 G4Pow::~G4Pow()
150 { << 94 {}
151 G4double res; <<
152 const auto i = static_cast<G4int>(4. * ( <<
153 const G4double y = 0.25 * i; <<
154 const G4double x = (a / y - 1.) * onethird; <<
155 res = lowa13[i] * (1. + x - x * <<
156 res = invert ? 1. / res : res; <<
157 return res; <<
158 } <<
159 95
160 // ------------------------------------------- 96 // -------------------------------------------------------------------
161 97
162 G4double G4Pow::powN(G4double x, G4int n) cons << 98 G4double G4Pow::powN(G4double x, G4int n)
163 { 99 {
164 if(0.0 == x) << 100 if(std::abs(n) > 8) { return std::pow(x, G4double(n)); }
165 { <<
166 return 0.0; <<
167 } <<
168 if(std::abs(n) > 8) <<
169 { <<
170 return std::pow(x, G4double(n)); <<
171 } <<
172 G4double res = 1.0; 101 G4double res = 1.0;
173 if(n >= 0) << 102 if(n >= 0) { for(G4int i=0; i<n; ++i) { res *= x; } }
>> 103 else if((n < 0) && (x != 0.0))
174 { 104 {
175 for(G4int i = 0; i < n; ++i) << 105 G4double y = 1.0/x;
176 { << 106 G4int nn = -n;
177 res *= x; << 107 for(G4int i=0; i<nn; ++i) { res *= y; }
178 } <<
179 } <<
180 else if(n < 0) <<
181 { <<
182 G4double y = 1.0 / x; <<
183 G4int nn = -n; <<
184 for(G4int i = 0; i < nn; ++i) <<
185 { <<
186 res *= y; <<
187 } <<
188 } 108 }
189 return res; 109 return res;
190 } 110 }
191 111