SingletonHolder.cpp

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// Mantid Repository : https://github.com/mantidproject/mantid
//
// Copyright © 2018 ISIS Rutherford Appleton Laboratory UKRI,
//   NScD Oak Ridge National Laboratory, European Spallation Source,
//   Institut Laue - Langevin & CSNS, Institute of High Energy Physics, CAS
// SPDX - License - Identifier: GPL - 3.0 +
#include "MantidKernel/SingletonHolder.h"
#include <list>
 
namespace Mantid::Kernel {
 
namespace {
using CleanupList = std::list<SingletonDeleterFn>;
 
CleanupList &cleanupList() {
  static CleanupList cleanup;
  return cleanup;
}
 
void cleanupSingletons() {
  auto &deleters = cleanupList();
  for (auto &deleter : deleters) {
    deleter();
  }
  deleters.clear();
}
} // namespace
 
void deleteOnExit(const SingletonDeleterFn &func) {
  auto &deleters = cleanupList();
  if (deleters.empty()) {
    atexit(&cleanupSingletons);
  }
  deleters.push_front(func);
}
} // namespace Mantid::Kernel