Geant4 Cross Reference

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Geant4/externals/clhep/include/CLHEP/Random/RandExponential.icc

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  1 // -*- C++ -*-
  2 // 
  3 // -----------------------------------------------------------------------
  4 //                             HEP Random
  5 //                       --- RandExponential ---
  6 //                 inlined functions implementation file
  7 // -----------------------------------------------------------------------
  8 // This file is part of Geant4 (simulation toolkit for HEP).
  9  
 10 // =======================================================================
 11 // Gabriele Cosmo - Created: 19th August 1998
 12 // =======================================================================
 13 
 14 #include <cmath>  // for log()
 15 
 16 namespace CLHEP {
 17 
 18 inline RandExponential::RandExponential(HepRandomEngine & anEngine,
 19                                         double mean )
 20 : HepRandom(), localEngine(&anEngine, do_nothing_deleter()), defaultMean(mean) {}
 21 
 22 inline RandExponential::RandExponential(HepRandomEngine * anEngine,
 23                                         double mean )
 24 : HepRandom(), localEngine(anEngine), defaultMean(mean) {}
 25 
 26 //-------------
 27 
 28 inline double RandExponential::shoot(HepRandomEngine* anEngine) {
 29   return -std::log(anEngine->flat());
 30 }
 31 
 32 inline double RandExponential::shoot(HepRandomEngine* anEngine,
 33                                         double mean) {
 34   return -std::log(anEngine->flat())*mean;
 35 }
 36 
 37 //-------------
 38 
 39 inline double RandExponential::fire() {
 40   return -std::log(localEngine->flat())*defaultMean;
 41 }
 42 
 43 inline double RandExponential::fire(double mean) {
 44   return -std::log(localEngine->flat())*mean;
 45 }
 46 
 47 }  // namespace CLHEP
 48