ParameterSetImplHelpers.h

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#ifndef fhiclcpp_detail_ParameterSetImplHelpers_h
#define fhiclcpp_detail_ParameterSetImplHelpers_h

#include "fhiclcpp/coding.h"

#include <any>
#include <string>
#include <vector>

namespace fhicl::detail {

  //===============================================================
  // get_names

  class Keys {
  public:
    Keys(std::vector<std::string> const& keys, std::string const& last)
      : tables_{keys}, last_{last}
    {}

    auto const&
    tables() const noexcept
    {
      return tables_;
    }
    auto const&
    last() const noexcept
    {
      return last_;
    }

  private:
    std::vector<std::string> tables_;
    std::string last_;
  };

  Keys get_names(std::string const& key);

  //===============================================================
  // get_sequence_indices

  class SequenceKey {
  public:
    SequenceKey(std::string const& name,
                std::vector<std::size_t> const& indices)
      : name_{name}, indices_{indices}
    {}

    auto const&
    name() const noexcept
    {
      return name_;
    }
    auto const&
    indices() const noexcept
    {
      return indices_;
    }

  private:
    std::string name_;
    std::vector<std::size_t> indices_;
  };

  SequenceKey get_sequence_indices(std::string const& key);

  //===============================================================
  // find_an_any

  using cit_size_t = std::vector<std::size_t>::const_iterator;

  inline bool
  find_an_any(cit_size_t it, cit_size_t const cend, std::any& a)
  {
    if (it == cend) {
      // If we got this far, that means the element must exist,
      // otherwise the previous recursive 'find_parameter' call would
      // have returned false.
      return true;
    }

    auto seq = std::any_cast<ps_sequence_t>(a);
    if (*it >= seq.size())
      return false;

    a = std::move(seq[*it]);

    return find_an_any(++it, cend, a);
  }
}

#endif /* fhiclcpp_detail_ParameterSetImplHelpers_h */

// Local variables:
// mode: c++
// End: