GenericRegisterer.h

// -*- tab-width: 2; indent-tabs-mode: nil; coding: utf-8-with-signature -*-
//-----------------------------------------------------------------------------
// Copyright 2000-2022 CEA (www.cea.fr) IFPEN (www.ifpenergiesnouvelles.com)
// See the top-level COPYRIGHT file for details.
// SPDX-License-Identifier: Apache-2.0
//-----------------------------------------------------------------------------
/*---------------------------------------------------------------------------*/
/* GenericRegisterer.h                                         (C) 2000-2022 */
/*                                                                           */
/* Enregistreur générique de types globaux.                                  */
/*---------------------------------------------------------------------------*/
#ifndef ARCANE_UTILS_GENERICREGISTERER_H
#define ARCANE_UTILS_GENERICREGISTERER_H
/*---------------------------------------------------------------------------*/
/*---------------------------------------------------------------------------*/
 
#include "arcane/utils/ArcaneGlobal.h"
 
/*---------------------------------------------------------------------------*/
/*---------------------------------------------------------------------------*/
 
namespace Arcane
{
 
class ARCANE_UTILS_EXPORT GenericRegistererBase
{
 protected:
 
  [[noreturn]] void doErrorConflict();
  [[noreturn]] void doErrorNonZeroCount();
};
 
/*---------------------------------------------------------------------------*/
/*---------------------------------------------------------------------------*/
template <typename Type>
class GenericRegisterer
: public GenericRegistererBase
{
 protected:
 
  class Info
  {
    friend GenericRegisterer<Type>;
 
   public:
 
    Type* firstRegisterer() const { return m_first_registerer; }
    Int32 nbRegisterer() const { return m_nb_registerer; }
 
   private:
 
    Type* m_first_registerer = nullptr;
    Int32 m_nb_registerer = 0;
  };
 
 public:
 
  using InstanceType = Type;
 
 public:
 
  GenericRegisterer() noexcept
  {
    _init();
  }
 
 public:
 
  InstanceType* previousRegisterer() const { return m_previous; }
 
  InstanceType* nextRegisterer() const { return m_next; }
 
 public:
 
  static InstanceType* firstRegisterer()
  {
    return Type::registererInfo().firstRegisterer();
  }
 
  static Integer nbRegisterer()
  {
    return Type::registererInfo().nbRegisterer();
  }
 
 private:
 
  InstanceType* m_previous = nullptr;
  InstanceType* m_next = nullptr;
 
 private:
 
  void _init() noexcept
  {
    Info& reg_info = Type::registererInfo();
    Type* current_instance = static_cast<Type*>(this);
    // ATTENTION: Cette méthode est appelée depuis un constructeur global
    // (donc avant le main()) et il ne faut pas faire d'exception dans ce code.
    InstanceType* first = reg_info.firstRegisterer();
    if (!first) {
      reg_info.m_first_registerer = current_instance;
      m_previous = nullptr;
      m_next = nullptr;
    }
    else {
      InstanceType* next = first->nextRegisterer();
      m_next = first;
      reg_info.m_first_registerer = current_instance;
      if (next)
        next->m_previous = current_instance;
    }
    ++reg_info.m_nb_registerer;
 
    // Check integrity
    auto* p = reg_info.firstRegisterer();
    Integer count = reg_info.nbRegisterer();
    while (p && count > 0) {
      p = p->nextRegisterer();
      --count;
    }
    if (p) {
      doErrorConflict();
    }
    else if (count > 0) {
      doErrorNonZeroCount();
    }
  }
};
 
/*---------------------------------------------------------------------------*/
/*---------------------------------------------------------------------------*/
 
} // End namespace Arcane
 
/*---------------------------------------------------------------------------*/
/*---------------------------------------------------------------------------*/
 
#endif