fhicl_key.h

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#ifndef art_Framework_Art_detail_fhicl_key_h
#define art_Framework_Art_detail_fhicl_key_h

// Class for concatenating FHiCL names into a dot-delimited FHiCL key

#include <string>

namespace art {
  namespace detail {

    template <typename T>
    std::enable_if_t<std::is_convertible<T, std::string>::value, std::string>
    fhicl_key(T const& name)
    {
      return name;
    }

    template <typename H, typename... T>
    std::enable_if_t<std::is_convertible<H, std::string>::value, std::string>
    fhicl_key(H const& hname, T const&... tnames)
    {
      std::string const head{hname};
      return head.empty() ? fhicl_key(tnames...) :
                            head + "." + fhicl_key(tnames...);
    }
  }
}

#endif /* art_Framework_Art_detail_fhicl_key_h */

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// mode: c++
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