RndmGen.cpp

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* (c) Copyright 1998-2019 CERN for the benefit of the LHCb and ATLAS collaborations *
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* copied verbatim in the file "LICENSE".                                            *
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//====================================================================
//  Random RndmGen class implementation
//--------------------------------------------------------------------
//
//  Package    : Gaudi/RndmGen ( The LHCb Offline System)
//  Author     : M.Frank
//  History    :
//  +---------+----------------------------------------------+--------+
//  |    Date |                 Comment                      | Who    |
//  +---------+----------------------------------------------+--------+
//  | 21/11/99| Initial version.                             | MF     |
//  +---------+----------------------------------------------+--------+
//====================================================================
#define GAUDI_RANDOMGENSVC_RNDMGEN_CPP

#include "RndmGen.h"
#include "GaudiKernel/IRndmEngine.h"
#include "GaudiKernel/ISvcLocator.h"
#include <algorithm>
#include <cfloat>

RndmGen::RndmGen( IInterface* engine ) : m_engine{engine} {}

StatusCode RndmGen::initialize( const IRndmGen::Param& par ) {
  m_params.reset( par.clone() );
  return m_engine ? StatusCode::SUCCESS : StatusCode::FAILURE;
}

StatusCode RndmGen::finalize() { return StatusCode::SUCCESS; }

StatusCode RndmGen::shootArray( std::vector<double>& array, long howmany, long start ) const {
  if ( !m_engine ) return StatusCode::FAILURE;
  array.resize( start + howmany );
  std::generate_n( std::next( std::begin( array ), start ), howmany, [&]() { return this->shoot(); } );
  return StatusCode::SUCCESS;
}