backport.h

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// Copyright 2002-2021 CEA LIST
// SPDX-FileCopyrightText: 2022 CEA LIST <gael.de-chalendar@cea.fr>
//
// SPDX-License-Identifier: MIT
 
#ifndef DEEPLIMA_INCLUDE_BACKPORT_H
#define DEEPLIMA_INCLUDE_BACKPORT_H
 
#include <unordered_map>
 
namespace deeplima
{
namespace utils
{
namespace backport
{
 
// backport from C++ 20
template<class K, class V, class H, class A, class P>
typename std::unordered_map<K, V, H, A>::size_type erase_if(std::unordered_map<K, V, H, A>& c, P pred)
{
  auto old_size = c.size();
  for (auto i = c.begin(), last = c.end(); i != last;) {
    if (pred(*i)) {
      i = c.erase(i);
    } else {
      ++i;
    }
  }
  return old_size - c.size();
}
 
} // namespace backport
} // namespace utils
} // namespace deeplima
 
#endif