MakeArray.h

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// 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 O2_MCH_RAW_IMPL_HELPERS_MAKE_ARRAY_H
#define O2_MCH_RAW_IMPL_HELPERS_MAKE_ARRAY_H
 
#include <array>
#include <type_traits>
 
namespace o2::mch::raw::impl
{
 
template <typename CTOR, size_t... S>
std::array<std::invoke_result_t<CTOR, size_t>, sizeof...(S)> makeArray(CTOR&& ctor,
                                                                       std::index_sequence<S...>)
{
  return std::array<std::invoke_result_t<CTOR, size_t>, sizeof...(S)>{{ctor(S)...}};
}
 
template <size_t N, typename CTOR>
std::array<std::invoke_result_t<CTOR, size_t>, N> makeArray(CTOR&& ctor)
{
  return makeArray(std::forward<CTOR>(ctor), std::make_index_sequence<N>());
}
 
} // namespace o2::mch::raw::impl
#endif