Rand4Hits_cpu.cxx

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/*
  Copyright (C) 2002-2026 CERN for the benefit of the ATLAS collaboration
*/
#include <random>
#include <vector>
#include <algorithm>
 
#define cpu_randgen_t std::mt19937
 
void Rand4Hits::createCPUGen( unsigned long long seed ) {
  cpu_randgen_t* eng = new cpu_randgen_t( seed );
  m_gen              = (void*)eng;
}
 
void Rand4Hits::destroyCPUGen() {
  if ( m_gen ) { delete (cpu_randgen_t*)m_gen; }
}
 
float* Rand4Hits::genCPU( size_t num ) {
  m_rnd_cpu.resize( num );
 
  cpu_randgen_t* eng = (cpu_randgen_t*)( m_gen );
 
  auto RNG = [eng]( float low, float high ) {
    auto randomFunc = [distribution_  = std::uniform_real_distribution<float>( low, high ),
                       &random_engine_ = *eng]() mutable { return distribution_( random_engine_ ); };
    return randomFunc;
  };
 
  std::generate_n( m_rnd_cpu.begin(), num, RNG( 0.f, 1.f ) );
 
  return m_rnd_cpu.data();
}