nonstd.h

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// Copyright (c) Microsoft Corporation. All rights reserved.
// Licensed under the Apache 2.0 License.
#pragma once
#include <string>
 
namespace ccf::nonstd
{
  // Iterators for map-keys and map-values
  template <typename TMapIterator>
  class KeyIterator : public TMapIterator
  {
  public:
    KeyIterator() : TMapIterator() {}
    KeyIterator(TMapIterator it) : TMapIterator(it) {}
 
    using Key =
      typename std::iterator_traits<TMapIterator>::value_type::first_type;
    using value_type = Key;
 
    Key* operator->()
    {
      return TMapIterator::operator->()->first;
    }
 
    Key operator*()
    {
      return TMapIterator::operator*().first;
    }
  };
 
  template <typename TMapIterator>
  class ValueIterator : public TMapIterator
  {
  public:
    ValueIterator() : TMapIterator() {}
    ValueIterator(TMapIterator it) : TMapIterator(it) {}
 
    using Value =
      typename std::iterator_traits<TMapIterator>::value_type::second_type;
    using value_type = Value;
 
    Value* operator->()
    {
      return TMapIterator::operator->()->second;
    }
 
    Value operator*()
    {
      return TMapIterator::operator*().second;
    }
  };
}