Constants.h

Go to the documentation of this file.

// Copyright 2019-2020 CERN and copyright holders of ALICE O2.
// See https://alice-o2.web.cern.ch/copyright for details of the copyright holders.
// All rights not expressly granted are reserved.
//
// This software is distributed under the terms of the GNU General Public
// License v3 (GPL Version 3), copied verbatim in the file "COPYING".
//
// In applying this license CERN does not waive the privileges and immunities
// granted to it by virtue of its status as an Intergovernmental Organization
// or submit itself to any jurisdiction.
 
#ifndef TRACKINGITSU_INCLUDE_CONSTANTS_H_
#define TRACKINGITSU_INCLUDE_CONSTANTS_H_
 
#include <array>
#include <utility>
 
#include "ITStracking/Definitions.h"
#include "GPUCommonDefAPI.h"
 
namespace o2::its::constants
{
 
constexpr float KB = 1024.f;
constexpr float MB = KB * KB;
constexpr float GB = MB * KB;
constexpr bool DoTimeBenchmarks = true;
constexpr bool SaveTimeBenchmarks = false;
 
GPUconstexpr() float Tolerance{1e-12}; // numerical tolerance
GPUconstexpr() int ClustersPerCell{3};
GPUconstexpr() int UnusedIndex{-1};
GPUconstexpr() float Resolution{0.0005f};
GPUconstexpr() float Radl = 9.36f; // Radiation length of Si [cm]
GPUconstexpr() float Rho = 2.33f;  // Density of Si [g/cm^3]
 
namespace helpers
{
 
// initialize a std::array at compile time fully with T
template <typename T, std::size_t N, T Value>
constexpr std::array<T, N> initArray()
{
  return []<std::size_t... Is>(std::index_sequence<Is...>) { return std::array<T, N>{(static_cast<void>(Is), Value)...}; }(std::make_index_sequence<N>{});
}
 
} // namespace helpers
} // namespace o2::its::constants
 
#endif /* TRACKINGITSU_INCLUDE_CONSTANTS_H_ */