Inplace visitor for boost::variant

gistfile1.txt

/**
 * Inplace visitor for boost::variant.
 * Usage:
 *   boost::variant<int, std::string> value = "1234";
 *   ...
 *   visit_in_place(value,
 *                  [](int v) { std::cout << "(int)" << v; },
 *                  [](std::string v) { std::cout << "(string)" << v;}
 *                  );
 */
template <typename TVariant, typename... TVisitors>
auto visit_in_place(TVariant &&variant, TVisitors &&... visitors) {
  return boost::apply_visitor(
  boost::hana::overload(std::forward<TVisitors>(visitors)...),
  std::forward<TVariant>(variant));
}