// In header: <boost/log/attributes/named_scope.hpp>

// Sentry object class to automatically push and pop scopes.
struct sentry {
  // construct/copy/destruct
  sentry(string_literal const &, string_literal const &, unsigned int, 
         scope_entry::scope_name_type = scope_entry::general) noexcept;
  sentry(sentry const &) = delete;
  sentry & operator=(sentry const &) = delete;
  ~sentry();
};