Condition.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_FRAMEWORK_CONDITION_H_
#define O2_FRAMEWORK_CONDITION_H_
#include <string>
 
namespace o2::framework
{
 
template <typename T>
struct Condition {
  std::string path;
  T* instance;
  using type = T;
 
  Condition(std::string path)
    : path(std::move(path))
  {
  }
 
  T* get()
  {
    return this->instance;
  }
 
  operator T()
  {
    return *this->instance;
  }
 
  T const* operator->() const
  {
    return this->instance;
  }
};
 
template <typename T>
concept is_condition = requires(T t) {
  typename T::type;
  requires std::same_as<typename T::type*, decltype(t.instance)>;
  requires std::same_as<std::string, decltype(t.path)>;
};
 
struct ConditionGroup {
};
 
template <typename T>
concept is_condition_group = std::derived_from<T, ConditionGroup>;
 
} // namespace o2::framework
#endif // O2_FRAMEWORK_CONDITION_H_