BaseProcess.hpp

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/*
 * (c) Copyright 2020 CORSIKA Project, corsika-project@lists.kit.edu
 *
 * This software is distributed under the terms of the GNU General Public
 * Licence version 3 (GPL Version 3). See file LICENSE for a full version of
 * the license.
 */

#pragma once

#include <corsika/framework/process/ProcessTraits.hpp>

#include <type_traits>


namespace corsika {

  template <typename TDerived>
  struct BaseProcess {
  protected:
    friend TDerived;

    BaseProcess() = default; // protected constructor will allow only
                             // derived classes to be created, not
                             // BaseProcess itself

    TDerived& ref() { return static_cast<TDerived&>(*this); }
    const TDerived& ref() const { return static_cast<const TDerived&>(*this); }

  public:
    static bool const is_process_sequence = false;
    static bool const is_switch_process_sequence = false;

    static unsigned int constexpr getNumberOfProcesses() { return 1; }

    using process_type = TDerived;
  };

  template <typename TProcess>
  struct is_process<
      TProcess,
      std::enable_if_t<std::is_base_of_v<BaseProcess<typename std::decay_t<TProcess>>,
                                         typename std::decay_t<TProcess>>>>
      : std::true_type {};

  template <typename TProcess, int N>
  struct count_processes<
      TProcess, N,
      typename std::enable_if_t<is_process_v<std::decay_t<TProcess>> &&
                                !std::decay_t<TProcess>::is_process_sequence>> {
    static unsigned int constexpr count = N + 1;
  };


} // namespace corsika