ToolConfigTable.h

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#ifndef art_Utilities_ToolConfigTable_h
#define art_Utilities_ToolConfigTable_h

#include "fhiclcpp/ParameterSet.h"
#include "fhiclcpp/types/Atom.h"
#include "fhiclcpp/types/ConfigurationTable.h"
#include "fhiclcpp/types/KeysToIgnore.h"
#include "fhiclcpp/types/Table.h"
#include "fhiclcpp/types/TableFragment.h"

#include <set>
#include <string>
#include <type_traits>

namespace art {

  struct MinimalToolConfig {
    fhicl::Atom<std::string> tool_type{fhicl::Name("tool_type")};
    struct KeysToIgnore {
      std::set<std::string>
      operator()()
      {
        return {};
      }
    };
  };

  template <typename UserConfig, typename UserKeysToIgnore = void>
  class ToolConfigTable : public fhicl::ConfigurationTable {
  public:
    ToolConfigTable(fhicl::Name&& name) : fullConfig_{std::move(name)} {}
    ToolConfigTable(fhicl::ParameterSet const& pset) : fullConfig_{pset} {}

    auto const&
    operator()() const
    {
      return fullConfig_().user();
    }
    auto const&
    get_PSet() const
    {
      return fullConfig_.get_PSet();
    }

    void
    print_allowed_configuration(std::ostream& os,
                                std::string const& prefix) const
    {
      fullConfig_.print_allowed_configuration(os, prefix);
    }

  private:
    template <typename T>
    struct FullConfig {
      fhicl::TableFragment<MinimalToolConfig> tool_type;
      fhicl::TableFragment<T> user;
    };

    using KeysToIgnore_t = std::conditional_t<
      std::is_void<UserKeysToIgnore>::value,
      MinimalToolConfig::KeysToIgnore,
      fhicl::KeysToIgnore<MinimalToolConfig::KeysToIgnore, UserKeysToIgnore>>;

    fhicl::Table<FullConfig<UserConfig>, KeysToIgnore_t> fullConfig_;
    cet::exempt_ptr<fhicl::detail::ParameterBase const>
    get_parameter_base() const override
    {
      return &fullConfig_;
    }
  };
}

#endif /* art_Utilities_ToolConfigTable_h */

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