| Geant4 Cross Reference |
>> 1 // $Id:$
1 // -*- C++ -*- 2 // -*- C++ -*-
2 // 3 //
3 // ------------------------------------------- 4 // -----------------------------------------------------------------------
4 // HEP Random 5 // HEP Random
5 // --- MTwistEngine --- 6 // --- MTwistEngine ---
6 // class implementation f 7 // class implementation file
7 // ------------------------------------------- 8 // -----------------------------------------------------------------------
8 // A "fast, compact, huge-period generator" ba 9 // A "fast, compact, huge-period generator" based on M. Matsumoto and
9 // T. Nishimura, "Mersenne Twister: A 623-dime 10 // T. Nishimura, "Mersenne Twister: A 623-dimensionally equidistributed
10 // uniform pseudorandom number generator", to 11 // uniform pseudorandom number generator", to appear in ACM Trans. on
11 // Modeling and Computer Simulation. It is a 12 // Modeling and Computer Simulation. It is a twisted GFSR generator
12 // with a Mersenne-prime period of 2^19937-1, 13 // with a Mersenne-prime period of 2^19937-1, uniform on open interval (0,1)
13 // =========================================== 14 // =======================================================================
14 // Ken Smith - Started initial draft: 15 // Ken Smith - Started initial draft: 14th Jul 1998
15 // - Optimized to get std::pow( << 16 // - Optimized to get pow() out of flat() method
16 // - Added conversion operators 17 // - Added conversion operators: 6th Aug 1998
17 // J. Marraffino - Added some explicit casts 18 // J. Marraffino - Added some explicit casts to deal with
18 // machines where sizeof(int) 19 // machines where sizeof(int) != sizeof(long) 22 Aug 1998
19 // M. Fischler - Modified constructors such 20 // M. Fischler - Modified constructors such that no two
20 // seeds will match sequences, no singl 21 // seeds will match sequences, no single/double
21 // seeds will match, explicit seeds giv 22 // seeds will match, explicit seeds give
22 // determined results, and default will 23 // determined results, and default will not
23 // match any of the above or other defa 24 // match any of the above or other defaults.
24 // - Modified use of the variou 25 // - Modified use of the various exponents of 2
25 // to avoid per-instance spac 26 // to avoid per-instance space overhead and
26 // correct the rounding proce 27 // correct the rounding procedure 16 Sep 1998
27 // J. Marraffino - Remove dependence on hepSt << 28 // J. Marfaffino - Remove dependence on hepString class 13 May 1999
28 // M. Fischler - In restore, checkFile for 29 // M. Fischler - In restore, checkFile for file not found 03 Dec 2004
29 // M. Fischler - Methods for distrib. insta 30 // M. Fischler - Methods for distrib. instacne save/restore 12/8/04
30 // M. Fischler - split get() into tag valid 31 // M. Fischler - split get() into tag validation and
31 // getState() for anonymous r 32 // getState() for anonymous restores 12/27/04
32 // M. Fischler - put/get for vectors of ulo 33 // M. Fischler - put/get for vectors of ulongs 3/14/05
33 // M. Fischler - State-saving using only in 34 // M. Fischler - State-saving using only ints, for portability 4/12/05
34 // M. Fischler - Improved seeding in setSee 35 // M. Fischler - Improved seeding in setSeed (Savanah bug #17479) 11/15/06
35 // - (Possible optimization - now that th 36 // - (Possible optimization - now that the seeding is improved,
36 // is it still necessary for ctor to "w 37 // is it still necessary for ctor to "warm up" by discarding
37 // 2000 iterations?) 38 // 2000 iterations?)
38 // 39 //
39 // =========================================== 40 // =======================================================================
40 41
41 #include "CLHEP/Random/Random.h" 42 #include "CLHEP/Random/Random.h"
42 #include "CLHEP/Random/MTwistEngine.h" 43 #include "CLHEP/Random/MTwistEngine.h"
43 #include "CLHEP/Random/engineIDulong.h" 44 #include "CLHEP/Random/engineIDulong.h"
44 #include "CLHEP/Utility/atomic_int.h" << 45 #include <string.h> // for strcmp
45 << 46 #include <cstdlib> // for std::abs(int)
46 #include <atomic> <<
47 #include <cmath> <<
48 #include <iostream> <<
49 #include <string.h> // for strcmp <<
50 #include <vector> <<
51 47
52 namespace CLHEP { 48 namespace CLHEP {
53 49
54 namespace { <<
55 // Number of instances with automatic seed s <<
56 CLHEP_ATOMIC_INT_TYPE numberOfEngines(0); <<
57 <<
58 // Maximum index into the seed table <<
59 const int maxIndex = 215; <<
60 } <<
61 <<
62 static const int MarkerLen = 64; // Enough roo 50 static const int MarkerLen = 64; // Enough room to hold a begin or end marker.
63 51
64 std::string MTwistEngine::name() const {return 52 std::string MTwistEngine::name() const {return "MTwistEngine";}
65 53
>> 54 int MTwistEngine::numEngines = 0;
>> 55 int MTwistEngine::maxIndex = 215;
>> 56
66 MTwistEngine::MTwistEngine() 57 MTwistEngine::MTwistEngine()
67 : HepRandomEngine() 58 : HepRandomEngine()
68 { 59 {
69 int numEngines = numberOfEngines++; <<
70 int cycle = std::abs(int(numEngines/maxIndex 60 int cycle = std::abs(int(numEngines/maxIndex));
71 int curIndex = std::abs(int(numEngines%maxIn 61 int curIndex = std::abs(int(numEngines%maxIndex));
72 long mask = ((cycle & 0x007fffff) << 8); 62 long mask = ((cycle & 0x007fffff) << 8);
73 long seedlist[2]; 63 long seedlist[2];
74 HepRandom::getTheTableSeeds( seedlist, curIn 64 HepRandom::getTheTableSeeds( seedlist, curIndex );
75 seedlist[0] = (seedlist[0])^mask; 65 seedlist[0] = (seedlist[0])^mask;
76 seedlist[1] = 0; 66 seedlist[1] = 0;
77 setSeeds( seedlist, numEngines ); 67 setSeeds( seedlist, numEngines );
78 count624=0; 68 count624=0;
79 << 69 ++numEngines;
80 for( int i=0; i < 2000; ++i ) flat(); / 70 for( int i=0; i < 2000; ++i ) flat(); // Warm up just a bit
81 } 71 }
82 72
83 MTwistEngine::MTwistEngine(long seed) 73 MTwistEngine::MTwistEngine(long seed)
84 : HepRandomEngine() 74 : HepRandomEngine()
85 { 75 {
86 long seedlist[2]={seed,17587}; 76 long seedlist[2]={seed,17587};
87 setSeeds( seedlist, 0 ); 77 setSeeds( seedlist, 0 );
88 count624=0; 78 count624=0;
89 for( int i=0; i < 2000; ++i ) flat(); / 79 for( int i=0; i < 2000; ++i ) flat(); // Warm up just a bit
90 } 80 }
91 81
92 MTwistEngine::MTwistEngine(int rowIndex, int c 82 MTwistEngine::MTwistEngine(int rowIndex, int colIndex)
93 : HepRandomEngine() 83 : HepRandomEngine()
94 { 84 {
95 int cycle = std::abs(int(rowIndex/maxIndex)) 85 int cycle = std::abs(int(rowIndex/maxIndex));
96 int row = std::abs(int(rowIndex%maxIndex)); 86 int row = std::abs(int(rowIndex%maxIndex));
97 int col = std::abs(int(colIndex%2)); 87 int col = std::abs(int(colIndex%2));
98 long mask = (( cycle & 0x000007ff ) << 20 ); 88 long mask = (( cycle & 0x000007ff ) << 20 );
99 long seedlist[2]; 89 long seedlist[2];
100 HepRandom::getTheTableSeeds( seedlist, row ) 90 HepRandom::getTheTableSeeds( seedlist, row );
101 seedlist[0] = (seedlist[col])^mask; 91 seedlist[0] = (seedlist[col])^mask;
102 seedlist[1] = 690691; 92 seedlist[1] = 690691;
103 setSeeds(seedlist, 4444772); 93 setSeeds(seedlist, 4444772);
104 count624=0; 94 count624=0;
105 for( int i=0; i < 2000; ++i ) flat(); / 95 for( int i=0; i < 2000; ++i ) flat(); // Warm up just a bit
106 } 96 }
107 97
108 MTwistEngine::MTwistEngine( std::istream& is ) 98 MTwistEngine::MTwistEngine( std::istream& is )
109 : HepRandomEngine() 99 : HepRandomEngine()
110 { 100 {
111 is >> *this; 101 is >> *this;
112 } 102 }
113 103
114 MTwistEngine::~MTwistEngine() {} 104 MTwistEngine::~MTwistEngine() {}
115 105
116 double MTwistEngine::flat() { 106 double MTwistEngine::flat() {
117 unsigned int y; 107 unsigned int y;
118 108
119 if( count624 >= N ) { 109 if( count624 >= N ) {
120 int i; 110 int i;
121 111
122 for( i=0; i < NminusM; ++i ) { 112 for( i=0; i < NminusM; ++i ) {
123 y = (mt[i] & 0x80000000) | (mt[i+1] & 0x 113 y = (mt[i] & 0x80000000) | (mt[i+1] & 0x7fffffff);
124 mt[i] = mt[i+M] ^ (y >> 1) ^ ((y & 114 mt[i] = mt[i+M] ^ (y >> 1) ^ ((y & 0x1) ? 0x9908b0df : 0x0 );
125 } 115 }
126 116
127 for( ; i < N-1 ; ++i ) { 117 for( ; i < N-1 ; ++i ) {
128 y = (mt[i] & 0x80000000) | (mt[i+1] & 0x 118 y = (mt[i] & 0x80000000) | (mt[i+1] & 0x7fffffff);
129 mt[i] = mt[i-NminusM] ^ (y >> 1) ^ ((y & 119 mt[i] = mt[i-NminusM] ^ (y >> 1) ^ ((y & 0x1) ? 0x9908b0df : 0x0 );
130 } 120 }
131 121
132 y = (mt[i] & 0x80000000) | (mt[0] & 0x7fff 122 y = (mt[i] & 0x80000000) | (mt[0] & 0x7fffffff);
133 mt[i] = mt[M-1] ^ (y >> 1) ^ ((y & 0x1) ? 123 mt[i] = mt[M-1] ^ (y >> 1) ^ ((y & 0x1) ? 0x9908b0df : 0x0 );
134 124
135 count624 = 0; 125 count624 = 0;
136 } 126 }
137 127
138 y = mt[count624]; 128 y = mt[count624];
139 y ^= ( y >> 11); 129 y ^= ( y >> 11);
140 y ^= ((y << 7 ) & 0x9d2c5680); 130 y ^= ((y << 7 ) & 0x9d2c5680);
141 y ^= ((y << 15) & 0xefc60000); 131 y ^= ((y << 15) & 0xefc60000);
142 y ^= ( y >> 18); 132 y ^= ( y >> 18);
143 133
144 return y * twoToMinus_3 134 return y * twoToMinus_32() + // Scale to range
145 (mt[count624++] >> 11) * twoToMinus_5 135 (mt[count624++] >> 11) * twoToMinus_53() + // fill remaining bits
146 nearlyTwoToMinus_54(); 136 nearlyTwoToMinus_54(); // make sure non-zero
147 } 137 }
148 138
149 void MTwistEngine::flatArray( const int size, 139 void MTwistEngine::flatArray( const int size, double *vect ) {
150 for( int i=0; i < size; ++i) vect[i] = flat( 140 for( int i=0; i < size; ++i) vect[i] = flat();
151 } 141 }
152 142
153 void MTwistEngine::setSeed(long seed, int k) { 143 void MTwistEngine::setSeed(long seed, int k) {
154 144
155 // MF 11/15/06 - Change seeding algorithm to 145 // MF 11/15/06 - Change seeding algorithm to a newer one recommended
156 // by Matsumoto: The original 146 // by Matsumoto: The original algorithm was
157 // mt[i] = (69069 * mt[i-1]) & 0xfffff 147 // mt[i] = (69069 * mt[i-1]) & 0xffffffff and this gives
158 // problems when the seed bit pattern 148 // problems when the seed bit pattern has lots of zeros
159 // (for example, 0x08000000). Savanah 149 // (for example, 0x08000000). Savanah bug #17479.
160 150
161 theSeed = seed ? seed : 4357; 151 theSeed = seed ? seed : 4357;
162 int mti; 152 int mti;
163 const int N1=624; 153 const int N1=624;
164 mt[0] = (unsigned int) (theSeed&0xffffffffUL 154 mt[0] = (unsigned int) (theSeed&0xffffffffUL);
165 for (mti=1; mti<N1; mti++) { 155 for (mti=1; mti<N1; mti++) {
166 mt[mti] = (1812433253UL * (mt[mti-1] ^ (mt 156 mt[mti] = (1812433253UL * (mt[mti-1] ^ (mt[mti-1] >> 30)) + mti);
167 /* See Knuth TAOCP Vol2. 3rd Ed. P.106 157 /* See Knuth TAOCP Vol2. 3rd Ed. P.106 for multiplier. */
168 /* In the previous versions, MSBs of t 158 /* In the previous versions, MSBs of the seed affect */
169 /* only MSBs of the array mt[]. 159 /* only MSBs of the array mt[]. */
170 /* 2002/01/09 modified by Makoto Matsu 160 /* 2002/01/09 modified by Makoto Matsumoto */
171 mt[mti] &= 0xffffffffUL; 161 mt[mti] &= 0xffffffffUL;
172 /* for >32 bit machines */ 162 /* for >32 bit machines */
173 } 163 }
174 for( int i=1; i < 624; ++i ) { 164 for( int i=1; i < 624; ++i ) {
175 mt[i] ^= k; // MF 9/16/98: distinguish 165 mt[i] ^= k; // MF 9/16/98: distinguish starting points
176 } 166 }
177 // MF 11/15/06 This distinction of starting 167 // MF 11/15/06 This distinction of starting points based on values of k
178 // is kept even though the seedi 168 // is kept even though the seeding algorithm itself is improved.
179 } 169 }
180 170
181 void MTwistEngine::setSeeds(const long *seeds, 171 void MTwistEngine::setSeeds(const long *seeds, int k) {
182 setSeed( (*seeds ? *seeds : 43571346), k ); 172 setSeed( (*seeds ? *seeds : 43571346), k );
183 int i; 173 int i;
184 for( i=1; i < 624; ++i ) { 174 for( i=1; i < 624; ++i ) {
185 mt[i] = ( seeds[1] + mt[i] ) & 0xffffffff; 175 mt[i] = ( seeds[1] + mt[i] ) & 0xffffffff; // MF 9/16/98
186 } 176 }
187 theSeeds = seeds; 177 theSeeds = seeds;
188 } 178 }
189 179
190 void MTwistEngine::saveStatus( const char file 180 void MTwistEngine::saveStatus( const char filename[] ) const
191 { 181 {
192 std::ofstream outFile( filename, std::ios:: 182 std::ofstream outFile( filename, std::ios::out ) ;
193 if (!outFile.bad()) { 183 if (!outFile.bad()) {
194 outFile << theSeed << std::endl; 184 outFile << theSeed << std::endl;
195 for (int i=0; i<624; ++i) outFile <<std:: 185 for (int i=0; i<624; ++i) outFile <<std::setprecision(20) << mt[i] << " ";
196 outFile << std::endl; 186 outFile << std::endl;
197 outFile << count624 << std::endl; 187 outFile << count624 << std::endl;
198 } 188 }
199 } 189 }
200 190
201 void MTwistEngine::restoreStatus( const char f 191 void MTwistEngine::restoreStatus( const char filename[] )
202 { 192 {
203 std::ifstream inFile( filename, std::ios::i 193 std::ifstream inFile( filename, std::ios::in);
204 if (!checkFile ( inFile, filename, engineNa 194 if (!checkFile ( inFile, filename, engineName(), "restoreStatus" )) {
205 std::cerr << " -- Engine state remains u 195 std::cerr << " -- Engine state remains unchanged\n";
206 return; 196 return;
207 } 197 }
208 198
209 if (!inFile.bad() && !inFile.eof()) { 199 if (!inFile.bad() && !inFile.eof()) {
210 inFile >> theSeed; 200 inFile >> theSeed;
211 for (int i=0; i<624; ++i) inFile >> mt[i] 201 for (int i=0; i<624; ++i) inFile >> mt[i];
212 inFile >> count624; 202 inFile >> count624;
213 } 203 }
214 } 204 }
215 205
216 void MTwistEngine::showStatus() const 206 void MTwistEngine::showStatus() const
217 { 207 {
218 std::cout << std::endl; 208 std::cout << std::endl;
219 std::cout << "--------- MTwist engine statu 209 std::cout << "--------- MTwist engine status ---------" << std::endl;
220 std::cout << std::setprecision(20); 210 std::cout << std::setprecision(20);
221 std::cout << " Initial seed = " << the 211 std::cout << " Initial seed = " << theSeed << std::endl;
222 std::cout << " Current index = " << cou 212 std::cout << " Current index = " << count624 << std::endl;
223 std::cout << " Array status mt[] = " << std 213 std::cout << " Array status mt[] = " << std::endl;
224 // 2014/06/06 L Garren << 214 for (int i=0; i<624; i+=5) {
225 // the final line has 4 elements, not 5 <<
226 for (int i=0; i<620; i+=5) { <<
227 std::cout << mt[i] << " " << mt[i+1] << 215 std::cout << mt[i] << " " << mt[i+1] << " " << mt[i+2] << " "
228 << mt[i+3] << " " << mt[i+4] << "\n"; << 216 << mt[i+3] << " " << mt[i+4] << std::endl;
229 } 217 }
230 std::cout << mt[620] << " " << mt[621] << <<
231 << mt[623] << std::endl; <<
232 std::cout << "----------------------------- 218 std::cout << "----------------------------------------" << std::endl;
233 } 219 }
234 220
235 MTwistEngine::operator double() { <<
236 return flat(); <<
237 } <<
238 <<
239 MTwistEngine::operator float() { 221 MTwistEngine::operator float() {
240 unsigned int y; 222 unsigned int y;
241 223
242 if( count624 >= N ) { 224 if( count624 >= N ) {
243 int i; 225 int i;
244 226
245 for( i=0; i < NminusM; ++i ) { 227 for( i=0; i < NminusM; ++i ) {
246 y = (mt[i] & 0x80000000) | (mt[i+1] & 0x 228 y = (mt[i] & 0x80000000) | (mt[i+1] & 0x7fffffff);
247 mt[i] = mt[i+M] ^ (y >> 1) ^ ((y & 229 mt[i] = mt[i+M] ^ (y >> 1) ^ ((y & 0x1) ? 0x9908b0df : 0x0 );
248 } 230 }
249 231
250 for( ; i < N-1 ; ++i ) { 232 for( ; i < N-1 ; ++i ) {
251 y = (mt[i] & 0x80000000) | (mt[i+1] & 0x 233 y = (mt[i] & 0x80000000) | (mt[i+1] & 0x7fffffff);
252 mt[i] = mt[i-NminusM] ^ (y >> 1) ^ ((y & 234 mt[i] = mt[i-NminusM] ^ (y >> 1) ^ ((y & 0x1) ? 0x9908b0df : 0x0 );
253 } 235 }
254 236
255 y = (mt[i] & 0x80000000) | (mt[0] & 0x7fff 237 y = (mt[i] & 0x80000000) | (mt[0] & 0x7fffffff);
256 mt[i] = mt[M-1] ^ (y >> 1) ^ ((y & 0x1) ? 238 mt[i] = mt[M-1] ^ (y >> 1) ^ ((y & 0x1) ? 0x9908b0df : 0x0 );
257 239
258 count624 = 0; 240 count624 = 0;
259 } 241 }
260 242
261 y = mt[count624++]; 243 y = mt[count624++];
262 y ^= ( y >> 11); 244 y ^= ( y >> 11);
263 y ^= ((y << 7 ) & 0x9d2c5680); 245 y ^= ((y << 7 ) & 0x9d2c5680);
264 y ^= ((y << 15) & 0xefc60000); 246 y ^= ((y << 15) & 0xefc60000);
265 y ^= ( y >> 18); 247 y ^= ( y >> 18);
266 248
267 return (float)(y * twoToMinus_32()); 249 return (float)(y * twoToMinus_32());
268 } 250 }
269 251
270 MTwistEngine::operator unsigned int() { 252 MTwistEngine::operator unsigned int() {
271 unsigned int y; 253 unsigned int y;
272 254
273 if( count624 >= N ) { 255 if( count624 >= N ) {
274 int i; 256 int i;
275 257
276 for( i=0; i < NminusM; ++i ) { 258 for( i=0; i < NminusM; ++i ) {
277 y = (mt[i] & 0x80000000) | (mt[i+1] & 0x 259 y = (mt[i] & 0x80000000) | (mt[i+1] & 0x7fffffff);
278 mt[i] = mt[i+M] ^ (y >> 1) ^ ((y & 260 mt[i] = mt[i+M] ^ (y >> 1) ^ ((y & 0x1) ? 0x9908b0df : 0x0 );
279 } 261 }
280 262
281 for( ; i < N-1 ; ++i ) { 263 for( ; i < N-1 ; ++i ) {
282 y = (mt[i] & 0x80000000) | (mt[i+1] & 0x 264 y = (mt[i] & 0x80000000) | (mt[i+1] & 0x7fffffff);
283 mt[i] = mt[i-NminusM] ^ (y >> 1) ^ ((y & 265 mt[i] = mt[i-NminusM] ^ (y >> 1) ^ ((y & 0x1) ? 0x9908b0df : 0x0 );
284 } 266 }
285 267
286 y = (mt[i] & 0x80000000) | (mt[0] & 0x7fff 268 y = (mt[i] & 0x80000000) | (mt[0] & 0x7fffffff);
287 mt[i] = mt[M-1] ^ (y >> 1) ^ ((y & 0x1) ? 269 mt[i] = mt[M-1] ^ (y >> 1) ^ ((y & 0x1) ? 0x9908b0df : 0x0 );
288 270
289 count624 = 0; 271 count624 = 0;
290 } 272 }
291 273
292 y = mt[count624++]; 274 y = mt[count624++];
293 y ^= ( y >> 11); 275 y ^= ( y >> 11);
294 y ^= ((y << 7 ) & 0x9d2c5680); 276 y ^= ((y << 7 ) & 0x9d2c5680);
295 y ^= ((y << 15) & 0xefc60000); 277 y ^= ((y << 15) & 0xefc60000);
296 y ^= ( y >> 18); 278 y ^= ( y >> 18);
297 279
298 return y; 280 return y;
299 } 281 }
300 282
301 std::ostream & MTwistEngine::put ( std::ostrea 283 std::ostream & MTwistEngine::put ( std::ostream& os ) const
302 { 284 {
303 char beginMarker[] = "MTwistEngine-begin"; 285 char beginMarker[] = "MTwistEngine-begin";
304 char endMarker[] = "MTwistEngine-end"; 286 char endMarker[] = "MTwistEngine-end";
305 287
306 long pr = os.precision(20); << 288 int pr = os.precision(20);
307 os << " " << beginMarker << " "; 289 os << " " << beginMarker << " ";
308 os << theSeed << " "; 290 os << theSeed << " ";
309 for (int i=0; i<624; ++i) { 291 for (int i=0; i<624; ++i) {
310 os << mt[i] << "\n"; 292 os << mt[i] << "\n";
311 } 293 }
312 os << count624 << " "; 294 os << count624 << " ";
313 os << endMarker << "\n"; 295 os << endMarker << "\n";
314 os.precision(pr); 296 os.precision(pr);
315 return os; 297 return os;
316 } 298 }
317 299
318 std::vector<unsigned long> MTwistEngine::put ( 300 std::vector<unsigned long> MTwistEngine::put () const {
319 std::vector<unsigned long> v; 301 std::vector<unsigned long> v;
320 v.push_back (engineIDulong<MTwistEngine>()); 302 v.push_back (engineIDulong<MTwistEngine>());
321 for (int i=0; i<624; ++i) { 303 for (int i=0; i<624; ++i) {
322 v.push_back(static_cast<unsigned long>(mt 304 v.push_back(static_cast<unsigned long>(mt[i]));
323 } 305 }
324 v.push_back(count624); 306 v.push_back(count624);
325 return v; 307 return v;
326 } 308 }
327 309
328 std::istream & MTwistEngine::get ( std::istre 310 std::istream & MTwistEngine::get ( std::istream& is )
329 { 311 {
330 char beginMarker [MarkerLen]; 312 char beginMarker [MarkerLen];
331 is >> std::ws; 313 is >> std::ws;
332 is.width(MarkerLen); // causes the next rea 314 is.width(MarkerLen); // causes the next read to the char* to be <=
333 // that many bytes, INCLUDING A TERMINAT 315 // that many bytes, INCLUDING A TERMINATION \0
334 // (Stroustrup, section 21.3.2) 316 // (Stroustrup, section 21.3.2)
335 is >> beginMarker; 317 is >> beginMarker;
336 if (strcmp(beginMarker,"MTwistEngine-begin") 318 if (strcmp(beginMarker,"MTwistEngine-begin")) {
337 is.clear(std::ios::badbit | is.rdstate()) 319 is.clear(std::ios::badbit | is.rdstate());
338 std::cerr << "\nInput stream mispositione 320 std::cerr << "\nInput stream mispositioned or"
339 << "\nMTwistEngine state description 321 << "\nMTwistEngine state description missing or"
340 << "\nwrong engine type found." << st 322 << "\nwrong engine type found." << std::endl;
341 return is; 323 return is;
342 } 324 }
343 return getState(is); 325 return getState(is);
344 } 326 }
345 327
346 std::string MTwistEngine::beginTag ( ) { 328 std::string MTwistEngine::beginTag ( ) {
347 return "MTwistEngine-begin"; 329 return "MTwistEngine-begin";
348 } 330 }
349 331
350 std::istream & MTwistEngine::getState ( std:: 332 std::istream & MTwistEngine::getState ( std::istream& is )
351 { 333 {
352 char endMarker [MarkerLen]; 334 char endMarker [MarkerLen];
353 is >> theSeed; 335 is >> theSeed;
354 for (int i=0; i<624; ++i) is >> mt[i]; 336 for (int i=0; i<624; ++i) is >> mt[i];
355 is >> count624; 337 is >> count624;
356 is >> std::ws; 338 is >> std::ws;
357 is.width(MarkerLen); 339 is.width(MarkerLen);
358 is >> endMarker; 340 is >> endMarker;
359 if (strcmp(endMarker,"MTwistEngine-end")) { 341 if (strcmp(endMarker,"MTwistEngine-end")) {
360 is.clear(std::ios::badbit | is.rdstate()) 342 is.clear(std::ios::badbit | is.rdstate());
361 std::cerr << "\nMTwistEngine state descri 343 std::cerr << "\nMTwistEngine state description incomplete."
362 << "\nInput stream is probably mispos 344 << "\nInput stream is probably mispositioned now." << std::endl;
363 return is; 345 return is;
364 } 346 }
365 return is; 347 return is;
366 } 348 }
367 349
368 bool MTwistEngine::get (const std::vector<unsi 350 bool MTwistEngine::get (const std::vector<unsigned long> & v) {
369 if ((v[0] & 0xffffffffUL) != engineIDulong<M 351 if ((v[0] & 0xffffffffUL) != engineIDulong<MTwistEngine>()) {
370 std::cerr << 352 std::cerr <<
371 "\nMTwistEngine get:state vector has wro 353 "\nMTwistEngine get:state vector has wrong ID word - state unchanged\n";
372 return false; 354 return false;
373 } 355 }
374 return getState(v); 356 return getState(v);
375 } 357 }
376 358
377 bool MTwistEngine::getState (const std::vector 359 bool MTwistEngine::getState (const std::vector<unsigned long> & v) {
378 if (v.size() != VECTOR_STATE_SIZE ) { 360 if (v.size() != VECTOR_STATE_SIZE ) {
379 std::cerr << 361 std::cerr <<
380 "\nMTwistEngine get:state vector has wro 362 "\nMTwistEngine get:state vector has wrong length - state unchanged\n";
381 return false; 363 return false;
382 } 364 }
383 for (int i=0; i<624; ++i) { 365 for (int i=0; i<624; ++i) {
384 mt[i]=(unsigned int)v[i+1]; << 366 mt[i]=v[i+1];
385 } 367 }
386 count624 = (int)v[625]; << 368 count624 = v[625];
387 return true; 369 return true;
388 } 370 }
389 371
390 } // namespace CLHEP 372 } // namespace CLHEP
391 373