What is the proper way to use robin_map in lambda function for parallelizing?

[engcang]

Thank you for the great work

As written in the title, I want to use the robin_map instead of std::unordered_map in lambda function.
Jumping into the code right away, the code below works well with std::unordered_map.

struct DataType
{
  bool to_be_del = false;
  DataType(){};
}

unordered_map<KeyType, DataType> candidates;
tbb::parallel_for_each(candidates.begin(), candidates.end(), [&](auto &cand_)
{
  if (some_condition)
  {
    cand_.second.to_be_del = true;
  }
});

But, as robin_map returns const iterator, the below code cannot be compiled.

tsl::robin_map<KeyType, DataType> candidates;
tbb::parallel_for_each(candidates.begin(), candidates.end(), [&](auto &cand_)
{
  if (some_condition)
  {
    cand_.second.to_be_del = true; // modifying const iterator
    cand_.value().to_be_del = true; // errors: cand_ has no member function named 'value()'
  }
});

As can be seen, I want to use tbb::parallel_for or tbb::parallel_for_each for faster computations.
So I would like to ask if there is a proper way to use robin_map and capture the iterator to modify the value within the lambda function!

Thank you in advance.