AllowedConfigurationMacro.h

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#ifndef fhiclcpp_types_AllowedConfigurationMacro_h
#define fhiclcpp_types_AllowedConfigurationMacro_h

// =====================================================================
//
// Extern allowed-configuration macro
//
// Use: Fill in
//
// =====================================================================

#include "cetlib/compiler_macros.h"
#include "fhiclcpp/types/ConfigurationTable.h"
#include "fhiclcpp/types/Name.h"

#include <memory>
#include <string>
#include <type_traits>

namespace fhicl::detail {

  template <class T, class Enable = void>
  struct AllowedConfiguration {
    static std::unique_ptr<fhicl::ConfigurationTable>
    get(std::string const& /*name*/)
    {
      return std::unique_ptr<fhicl::ConfigurationTable>{nullptr};
    }
  };

  template <class T>
  struct AllowedConfiguration<T,
                              std::void_t<decltype(typename T::Parameters{
                                std::declval<fhicl::Name>()})>> {
    static std::unique_ptr<fhicl::ConfigurationTable>
    get(std::string const& name)
    {
      return std::make_unique<typename T::Parameters>(fhicl::Name{name});
    }
  };
}

#define FHICL_PROVIDE_ALLOWED_CONFIGURATION(klass)                             \
  EXTERN_C_FUNC_DECLARE_START                                                  \
  std::unique_ptr<fhicl::ConfigurationTable> allowed_configuration(            \
    std::string const& name)                                                   \
  {                                                                            \
    return fhicl::detail::AllowedConfiguration<klass>::get(name);              \
  }                                                                            \
  EXTERN_C_FUNC_DECLARE_END

#endif /* fhiclcpp_types_AllowedConfigurationMacro_h */

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// mode: c++
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