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New class used for primary vertex finding (AliITSVertexerTracks)
[u/mrichter/AliRoot.git] / EVGEN / AliGenParam.cxx
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4c039060 1/**************************************************************************
2 * Copyright(c) 1998-1999, ALICE Experiment at CERN, All rights reserved. *
3 * *
4 * Author: The ALICE Off-line Project. *
5 * Contributors are mentioned in the code where appropriate. *
6 * *
7 * Permission to use, copy, modify and distribute this software and its *
8 * documentation strictly for non-commercial purposes is hereby granted *
9 * without fee, provided that the above copyright notice appears in all *
10 * copies and that both the copyright notice and this permission notice *
11 * appear in the supporting documentation. The authors make no claims *
12 * about the suitability of this software for any purpose. It is *
13 * provided "as is" without express or implied warranty. *
14 **************************************************************************/
15
16/*
17$Log$
5bd39445 18Revision 1.40 2002/10/14 14:55:35 hristov
19Merging the VirtualMC branch to the main development branch (HEAD)
20
b9d0a01d 21Revision 1.36.6.3 2002/10/10 16:40:08 hristov
22Updating VirtualMC to v3-09-02
23
24Revision 1.39 2002/09/16 08:21:16 morsch
25Use TDatabasePDG::Instance();
26
349be858 27Revision 1.38 2002/05/30 14:59:12 morsch
28Check geometrical acceptance. (G. Martinez)
29
1242532d 30Revision 1.37 2002/04/17 10:20:44 morsch
31Coding Rule violations corrected.
32
6d4dd317 33Revision 1.36 2002/02/08 16:50:50 morsch
34Add name and title in constructor.
35
8b31bfac 36Revision 1.35 2002/01/21 10:02:40 morsch
37ty is Double_t
38Abort if too high rapidity causes numerical paroblem. User has to specify
39meaningful y-range.
40
2d7a47be 41Revision 1.34 2001/11/27 13:13:07 morsch
42Maximum lifetime for long-lived particles to be put on the stack is parameter.
43It can be set via SetMaximumLifetime(..).
44
47fc6bd5 45Revision 1.33 2001/10/21 18:35:56 hristov
46Several pointers were set to zero in the default constructors to avoid memory management problems
47
2685bf00 48Revision 1.32 2001/07/27 17:09:36 morsch
49Use local SetTrack, KeepTrack and SetHighWaterMark methods
50to delegate either to local stack or to stack owned by AliRun.
51(Piotr Skowronski, A.M.)
52
a99cf51f 53Revision 1.31 2001/07/13 10:58:54 morsch
54- Some coded moved to AliGenMC
55- Improved handling of secondary vertices.
56
fff02fee 57Revision 1.30 2001/06/15 07:55:04 morsch
58Put only first generation decay products on the stack.
59
6ba00c52 60Revision 1.29 2001/03/27 10:58:41 morsch
61Initialize decayer before generation. Important if run inside cocktail.
62
771bbe45 63Revision 1.28 2001/03/09 13:01:41 morsch
64- enum constants for paramterisation type (particle family) moved to AliGen*lib.h
65- use AliGenGSIlib::kUpsilon, AliGenPHOSlib::kEtaPrime to access the constants
66
34f60c01 67Revision 1.27 2001/02/02 15:21:10 morsch
68Set high water mark after last particle.
69Use Vertex() method for Vertex.
70
d9ea0e3b 71Revision 1.26 2000/12/21 16:24:06 morsch
72Coding convention clean-up
73
675e9664 74Revision 1.25 2000/11/30 07:12:50 alibrary
75Introducing new Rndm and QA classes
76
65fb704d 77Revision 1.24 2000/10/18 19:11:27 hristov
78Division by zero fixed
79
919c2096 80Revision 1.23 2000/10/02 21:28:06 fca
81Removal of useless dependecies via forward declarations
82
94de3818 83Revision 1.22 2000/09/12 14:14:55 morsch
84Call fDecayer->ForceDecay() at the beginning of Generate().
85
00d6ce7d 86Revision 1.21 2000/09/08 15:39:01 morsch
87Handle the case fForceDecay=all during the generation, i.e. select all secondaries.
88
5ab0acc9 89Revision 1.20 2000/09/06 14:35:44 morsch
90Use AliDecayerPythia for particle decays.
91
fa480368 92Revision 1.19 2000/07/11 18:24:56 fca
93Coding convention corrections + few minor bug fixes
94
aee8290b 95Revision 1.18 2000/06/29 21:08:27 morsch
96All paramatrisation libraries derive from the pure virtual base class AliGenLib.
97This allows to pass a pointer to a library directly to AliGenParam and avoids the
98use of function pointers in Config.C.
99
b22ee262 100Revision 1.17 2000/06/09 20:33:30 morsch
101All coding rule violations except RS3 corrected
102
f87cfe57 103Revision 1.16 2000/05/02 07:51:31 morsch
104- Control precision of pT sampling TF1::SetNpx(..)
105- Correct initialisation of child-cuts in all constructors.
106- Most coding rule violations corrected.
107
749070b6 108Revision 1.15 2000/04/03 15:42:12 morsch
109Cuts on primary particles are separated from those on the decay products. Methods
110SetChildMomentumRange, SetChildPtRange, SetChildPhiRange, SetChildThetaRange added.
111
cc5d764c 112Revision 1.14 1999/11/09 07:38:48 fca
113Changes for compatibility with version 2.23 of ROOT
114
084c1b4a 115Revision 1.13 1999/11/04 11:30:31 fca
116Correct the logics for SetForceDecay
117
28337bc1 118Revision 1.12 1999/11/03 17:43:20 fca
119New version from G.Martinez & A.Morsch
120
886b6f73 121Revision 1.11 1999/09/29 09:24:14 fca
122Introduction of the Copyright and cvs Log
123
4c039060 124*/
125
6d4dd317 126
127
128// Class to generate particles from using paramtrized pT and y distributions.
129// Distributions are obtained from pointer to object of type AliGenLib.
130// (For example AliGenMUONlib)
131// Decays are performed using Pythia.
132// andreas.morsch@cern.ch
133
fe4da5cc 134#include "AliGenParam.h"
fa480368 135#include "AliDecayerPythia.h"
fe4da5cc 136#include "AliGenMUONlib.h"
137#include "AliRun.h"
1578254f 138#include <TParticle.h>
fa480368 139#include <TParticlePDG.h>
140#include <TDatabasePDG.h>
141#include <TLorentzVector.h>
142
f87cfe57 143#include <TF1.h>
5bd39445 144#include <TCanvas.h>
145#include <TH1.h>
fe4da5cc 146
147ClassImp(AliGenParam)
148
149//------------------------------------------------------------
150
151 //Begin_Html
152 /*
1439f98e 153 <img src="picts/AliGenParam.gif">
fe4da5cc 154 */
155 //End_Html
156
157//____________________________________________________________
158//____________________________________________________________
159AliGenParam::AliGenParam()
fe4da5cc 160{
b22ee262 161// Deafault constructor
162 fPtPara = 0;
163 fYPara = 0;
34f60c01 164 fParam = 0;
165 fAnalog = kAnalog;
b22ee262 166 SetDeltaPt();
675e9664 167//
168// Set random number generator
169 sRandom = fRandom;
2685bf00 170 fDecayer = 0;
8b31bfac 171
172
b22ee262 173}
174
fff02fee 175AliGenParam::AliGenParam(Int_t npart, AliGenLib * Library, Int_t param, char* tname):AliGenMC(npart)
b22ee262 176{
177// Constructor using number of particles parameterisation id and library
8b31bfac 178 fName = "Param";
179 fTitle= "Particle Generator using pT and y parameterisation";
b22ee262 180
181 fPtParaFunc = Library->GetPt(param, tname);
182 fYParaFunc = Library->GetY (param, tname);
183 fIpParaFunc = Library->GetIp(param, tname);
184
185 fPtPara = 0;
186 fYPara = 0;
187 fParam = param;
34f60c01 188 fAnalog = kAnalog;
b22ee262 189 SetForceDecay();
b22ee262 190 SetDeltaPt();
675e9664 191//
192// Set random number generator
193 sRandom = fRandom;
fe4da5cc 194}
195
196//____________________________________________________________
886b6f73 197
fff02fee 198AliGenParam::AliGenParam(Int_t npart, Int_t param, char* tname):AliGenMC(npart)
fe4da5cc 199{
b22ee262 200// Constructor using parameterisation id and number of particles
8b31bfac 201//
202 fName = "Param";
203 fTitle= "Particle Generator using pT and y parameterisation";
204
675e9664 205 AliGenLib* pLibrary = new AliGenMUONlib();
b22ee262 206
675e9664 207 fPtParaFunc = pLibrary->GetPt(param, tname);
208 fYParaFunc = pLibrary->GetY (param, tname);
209 fIpParaFunc = pLibrary->GetIp(param, tname);
b22ee262 210
211 fPtPara = 0;
212 fYPara = 0;
213 fParam = param;
34f60c01 214 fAnalog = kAnalog;
b22ee262 215 fChildSelect.Set(5);
216 for (Int_t i=0; i<5; i++) fChildSelect[i]=0;
217 SetForceDecay();
218 SetCutOnChild();
219 SetChildMomentumRange();
220 SetChildPtRange();
221 SetChildPhiRange();
222 SetChildThetaRange();
223 SetDeltaPt();
fe4da5cc 224}
225
34f60c01 226AliGenParam::AliGenParam(Int_t npart, Int_t param,
886b6f73 227 Double_t (*PtPara) (Double_t*, Double_t*),
228 Double_t (*YPara ) (Double_t* ,Double_t*),
65fb704d 229 Int_t (*IpPara) (TRandom *))
fff02fee 230 :AliGenMC(npart)
886b6f73 231{
749070b6 232// Constructor
28337bc1 233// Gines Martinez 1/10/99
8b31bfac 234 fName = "Param";
235 fTitle= "Particle Generator using pT and y parameterisation";
236
886b6f73 237 fPtParaFunc = PtPara;
238 fYParaFunc = YPara;
239 fIpParaFunc = IpPara;
28337bc1 240//
886b6f73 241 fPtPara = 0;
242 fYPara = 0;
243 fParam = param;
34f60c01 244 fAnalog = kAnalog;
886b6f73 245 fChildSelect.Set(5);
246 for (Int_t i=0; i<5; i++) fChildSelect[i]=0;
247 SetForceDecay();
248 SetCutOnChild();
749070b6 249 SetChildMomentumRange();
250 SetChildPtRange();
251 SetChildPhiRange();
252 SetChildThetaRange();
253 SetDeltaPt();
886b6f73 254}
255
f87cfe57 256
6d4dd317 257AliGenParam::AliGenParam(const AliGenParam & Param)
f87cfe57 258{
259// copy constructor
6d4dd317 260 Param.Copy(*this);
f87cfe57 261}
262
fe4da5cc 263//____________________________________________________________
264AliGenParam::~AliGenParam()
265{
749070b6 266// Destructor
fe4da5cc 267 delete fPtPara;
268 delete fYPara;
269}
270
271//____________________________________________________________
272void AliGenParam::Init()
273{
749070b6 274// Initialisation
fa480368 275
276 fDecayer = new AliDecayerPythia();
fe4da5cc 277 //Begin_Html
278 /*
1439f98e 279 <img src="picts/AliGenParam.gif">
fe4da5cc 280 */
281 //End_Html
282
749070b6 283 fPtPara = new TF1("Pt-Parametrization",fPtParaFunc,fPtMin,fPtMax,0);
284// Set representation precision to 10 MeV
285 Int_t npx= Int_t((fPtMax-fPtMin)/fDeltaPt);
286
287 fPtPara->SetNpx(npx);
288
289 fYPara = new TF1("Y -Parametrization",fYParaFunc,fYMin,fYMax,0);
290 TF1* ptPara = new TF1("Pt-Parametrization",fPtParaFunc,0,15,0);
291 TF1* yPara = new TF1("Y -Parametrization",fYParaFunc,-6,6,0);
b7601ac4 292
fe4da5cc 293//
294// dN/dy| y=0
749070b6 295 Double_t y1=0;
296 Double_t y2=0;
297
298 fdNdy0=fYParaFunc(&y1,&y2);
fe4da5cc 299//
300// Integral over generation region
749070b6 301 Float_t intYS = yPara ->Integral(fYMin, fYMax);
302 Float_t intPt0 = ptPara->Integral(0,15);
303 Float_t intPtS = ptPara->Integral(fPtMin,fPtMax);
304 Float_t phiWgt=(fPhiMax-fPhiMin)/2./TMath::Pi();
34f60c01 305 if (fAnalog == kAnalog) {
749070b6 306 fYWgt = intYS/fdNdy0;
307 fPtWgt = intPtS/intPt0;
308 fParentWeight = fYWgt*fPtWgt*phiWgt/fNpart;
309 } else {
310 fYWgt = intYS/fdNdy0;
311 fPtWgt = (fPtMax-fPtMin)/intPt0;
312 fParentWeight = fYWgt*fPtWgt*phiWgt/fNpart;
313 }
fe4da5cc 314//
315// particle decay related initialization
00d6ce7d 316 fDecayer->SetForceDecay(fForceDecay);
fa480368 317 fDecayer->Init();
00d6ce7d 318
fe4da5cc 319//
fff02fee 320 AliGenMC::Init();
fe4da5cc 321}
322
323//____________________________________________________________
324void AliGenParam::Generate()
325{
28337bc1 326//
327// Generate 'npart' of light and heavy mesons (J/Psi, upsilon or phi, Pion,
328// Kaons, Etas, Omegas) and Baryons (proton, antiprotons, neutrons and
329// antineutrons in the the desired theta, phi and momentum windows;
330// Gaussian smearing on the vertex is done if selected.
cc5d764c 331// The decay of heavy mesons is done using lujet,
332// and the childern particle are tracked by GEANT
333// However, light mesons are directly tracked by GEANT
334// setting fForceDecay = nodecay (SetForceDecay(nodecay))
28337bc1 335//
771bbe45 336//
337// Reinitialize decayer
338 fDecayer->Init();
339//
28337bc1 340 Float_t polar[3]= {0,0,0}; // Polarisation of the parent particle (for GEANT tracking)
341 Float_t origin0[3]; // Origin of the generated parent particle (for GEANT tracking)
342 Float_t pt, pl, ptot; // Transverse, logitudinal and total momenta of the parent particle
343 Float_t phi, theta; // Phi and theta spherical angles of the parent particle momentum
344 Float_t p[3], pc[3],
fff02fee 345 och[3]; // Momentum, polarisation and origin of the children particles from lujet
2d7a47be 346 Double_t ty, xmt;
fff02fee 347 Int_t nt, i, j;
fe4da5cc 348 Float_t wgtp, wgtch;
349 Double_t dummy;
09fd3ea2 350 static TClonesArray *particles;
fe4da5cc 351 //
fff02fee 352 if(!particles) particles = new TClonesArray("TParticle",1000);
8b31bfac 353
349be858 354 TDatabasePDG *pDataBase = TDatabasePDG::Instance();
fe4da5cc 355 //
356 Float_t random[6];
28337bc1 357
358// Calculating vertex position per event
fe4da5cc 359 for (j=0;j<3;j++) origin0[j]=fOrigin[j];
aee8290b 360 if(fVertexSmear==kPerEvent) {
d9ea0e3b 361 Vertex();
362 for (j=0;j<3;j++) origin0[j]=fVertex[j];
fe4da5cc 363 }
d9ea0e3b 364
21aaa175 365 Int_t ipa=0;
fff02fee 366
28337bc1 367// Generating fNpart particles
21aaa175 368 while (ipa<fNpart) {
cc5d764c 369 while(1) {
fe4da5cc 370//
371// particle type
65fb704d 372 Int_t iPart = fIpParaFunc(fRandom);
fa480368 373 fChildWeight=(fDecayer->GetPartialBranchingRatio(iPart))*fParentWeight;
675e9664 374 TParticlePDG *particle = pDataBase->GetParticle(iPart);
fa480368 375 Float_t am = particle->Mass();
8b31bfac 376
65fb704d 377 Rndm(random,2);
fe4da5cc 378//
379// phi
380 phi=fPhiMin+random[0]*(fPhiMax-fPhiMin);
381//
382// y
2d7a47be 383 ty = TMath::TanH(fYPara->GetRandom());
fe4da5cc 384//
385// pT
34f60c01 386 if (fAnalog == kAnalog) {
fe4da5cc 387 pt=fPtPara->GetRandom();
388 wgtp=fParentWeight;
389 wgtch=fChildWeight;
390 } else {
391 pt=fPtMin+random[1]*(fPtMax-fPtMin);
392 Double_t ptd=pt;
393 wgtp=fParentWeight*fPtParaFunc(& ptd, &dummy);
394 wgtch=fChildWeight*fPtParaFunc(& ptd, &dummy);
395 }
396 xmt=sqrt(pt*pt+am*am);
2d7a47be 397 if (TMath::Abs(ty)==1.) {
398 ty=0.;
399 Fatal("AliGenParam",
400 "Division by 0: Please check you rapidity range !");
401 }
402
fe4da5cc 403 pl=xmt*ty/sqrt(1.-ty*ty);
404 theta=TMath::ATan2(pt,pl);
cc5d764c 405// Cut on theta
fe4da5cc 406 if(theta<fThetaMin || theta>fThetaMax) continue;
407 ptot=TMath::Sqrt(pt*pt+pl*pl);
cc5d764c 408// Cut on momentum
fe4da5cc 409 if(ptot<fPMin || ptot>fPMax) continue;
fff02fee 410//
fe4da5cc 411 p[0]=pt*TMath::Cos(phi);
412 p[1]=pt*TMath::Sin(phi);
413 p[2]=pl;
aee8290b 414 if(fVertexSmear==kPerTrack) {
65fb704d 415 Rndm(random,6);
fe4da5cc 416 for (j=0;j<3;j++) {
417 origin0[j]=
418 fOrigin[j]+fOsigma[j]*TMath::Cos(2*random[2*j]*TMath::Pi())*
419 TMath::Sqrt(-2*TMath::Log(random[2*j+1]));
420 }
421 }
28337bc1 422
423// Looking at fForceDecay :
cc5d764c 424// if fForceDecay != none Primary particle decays using
425// AliPythia and children are tracked by GEANT
28337bc1 426//
cc5d764c 427// if fForceDecay == none Primary particle is tracked by GEANT
428// (In the latest, make sure that GEANT actually does all the decays you want)
fe4da5cc 429//
fff02fee 430
34f60c01 431 if (fForceDecay != kNoDecay) {
28337bc1 432// Using lujet to decay particle
886b6f73 433 Float_t energy=TMath::Sqrt(ptot*ptot+am*am);
fa480368 434 TLorentzVector pmom(p[0], p[1], p[2], energy);
435 fDecayer->Decay(iPart,&pmom);
fe4da5cc 436//
cc5d764c 437// select decay particles
fa480368 438 Int_t np=fDecayer->ImportParticles(particles);
1242532d 439
440 // Selecting GeometryAcceptance for particles fPdgCodeParticleforAcceptanceCut;
441 if (fGeometryAcceptance)
442 if (!CheckAcceptanceGeometry(np,particles)) continue;
886b6f73 443 Int_t ncsel=0;
fff02fee 444 Int_t* pFlag = new Int_t[np];
445 Int_t* pParent = new Int_t[np];
446 Int_t* pSelected = new Int_t[np];
447 Int_t* trackIt = new Int_t[np];
448
449 for (i=0; i<np; i++) {
450 pFlag[i] = 0;
451 pSelected[i] = 0;
452 pParent[i] = -1;
453 }
454
6ba00c52 455 if (np >1) {
456 TParticle* iparticle = (TParticle *) particles->At(0);
fff02fee 457 Int_t ipF, ipL;
458 for (i = 1; i<np ; i++) {
459 trackIt[i] = 1;
6ba00c52 460 iparticle = (TParticle *) particles->At(i);
461 Int_t kf = iparticle->GetPdgCode();
fff02fee 462 Int_t ks = iparticle->GetStatusCode();
463// flagged particle
464
465 if (pFlag[i] == 1) {
fff02fee 466 ipF = iparticle->GetFirstDaughter();
467 ipL = iparticle->GetLastDaughter();
468 if (ipF > 0) for (j=ipF-1; j<ipL; j++) pFlag[j]=1;
469 continue;
470 }
471
472// flag decay products of particles with long life-time (c tau > .3 mum)
473
474 if (ks != 1) {
2d7a47be 475// TParticlePDG *particle = pDataBase->GetParticle(kf);
fff02fee 476
477 Double_t lifeTime = fDecayer->GetLifetime(kf);
2d7a47be 478// Double_t mass = particle->Mass();
479// Double_t width = particle->Width();
47fc6bd5 480 if (lifeTime > (Double_t) fMaxLifeTime) {
fff02fee 481 ipF = iparticle->GetFirstDaughter();
482 ipL = iparticle->GetLastDaughter();
483 if (ipF > 0) for (j=ipF-1; j<ipL; j++) pFlag[j]=1;
484 } else{
485 trackIt[i] = 0;
486 pSelected[i] = 1;
487 }
488 } // ks==1 ?
fe4da5cc 489//
490// children
47fc6bd5 491
fff02fee 492 if (ChildSelected(TMath::Abs(kf)) || fForceDecay == kAll && trackIt[i])
6ba00c52 493 {
6ba00c52 494 if (fCutOnChild) {
fff02fee 495 pc[0]=iparticle->Px();
496 pc[1]=iparticle->Py();
497 pc[2]=iparticle->Pz();
498 Bool_t childok = KinematicSelection(iparticle, 1);
499 if(childok) {
500 pSelected[i] = 1;
6ba00c52 501 ncsel++;
502 } else {
503 ncsel=-1;
504 break;
505 } // child kine cuts
506 } else {
fff02fee 507 pSelected[i] = 1;
886b6f73 508 ncsel++;
6ba00c52 509 } // if child selection
510 } // select muon
511 } // decay particle loop
512 } // if decay products
513
886b6f73 514 Int_t iparent;
515 if ((fCutOnChild && ncsel >0) || !fCutOnChild){
516 ipa++;
21aaa175 517//
fff02fee 518// Parent
a99cf51f 519 SetTrack(0, -1, iPart, p, origin0, polar, 0, kPPrimary, nt, wgtp);
fff02fee 520 pParent[0] = nt;
a99cf51f 521 KeepTrack(nt);
fff02fee 522//
523// Decay Products
524//
525 for (i = 1; i < np; i++) {
526 if (pSelected[i]) {
527 TParticle* iparticle = (TParticle *) particles->At(i);
528 Int_t kf = iparticle->GetPdgCode();
529 Int_t ipa = iparticle->GetFirstMother()-1;
530
531 och[0] = origin0[0]+iparticle->Vx()/10;
532 och[1] = origin0[1]+iparticle->Vy()/10;
533 och[2] = origin0[2]+iparticle->Vz()/10;
534 pc[0] = iparticle->Px();
535 pc[1] = iparticle->Py();
536 pc[2] = iparticle->Pz();
537
538 if (ipa > -1) {
539 iparent = pParent[ipa];
540 } else {
541 iparent = -1;
542 }
1242532d 543
a99cf51f 544 SetTrack(fTrackIt*trackIt[i], iparent, kf,
fff02fee 545 pc, och, polar,
546 0, kPDecay, nt, wgtch);
547 pParent[i] = nt;
a99cf51f 548 KeepTrack(nt);
8b31bfac 549 } // Selected
550 } // Particle loop
28337bc1 551 } // Decays by Lujet
8b31bfac 552 particles->Clear();
fff02fee 553 if (pFlag) delete[] pFlag;
554 if (pParent) delete[] pParent;
555 if (pSelected) delete[] pSelected;
8b31bfac 556 if (trackIt) delete[] trackIt;
21aaa175 557 } // kinematic selection
28337bc1 558 else // nodecay option, so parent will be tracked by GEANT (pions, kaons, eta, omegas, baryons)
559 {
560 gAlice->
65fb704d 561 SetTrack(fTrackIt,-1,iPart,p,origin0,polar,0,kPPrimary,nt,wgtp);
28337bc1 562 ipa++;
563 }
fe4da5cc 564 break;
21aaa175 565 } // while
fe4da5cc 566 } // event loop
a99cf51f 567 SetHighWaterMark(nt);
fe4da5cc 568}
569
5bd39445 570void AliGenParam::Draw()
571{
572 //
573 // Draw the pT and y Distributions
574 //
575 TCanvas *c0 = new TCanvas("c0","Canvas 0",400,10,600,700);
576 c0->Divide(2,1);
577 c0->cd(1);
578 fPtPara->Draw();
579 fPtPara->GetHistogram()->SetXTitle("p_{T} (GeV)");
580 c0->cd(2);
581 fYPara->Draw();
582 fYPara->GetHistogram()->SetXTitle("y");
583}
584
f87cfe57 585AliGenParam& AliGenParam::operator=(const AliGenParam& rhs)
586{
587// Assignment operator
588 return *this;
589}
590
fe4da5cc 591
592