Function json_array_prepend

libbuild2/variable.cxx:2324–2346

  }

  static void
  json_array_prepend (value& v, names&& ns, const variable* var)
  {
    using val_traits = value_traits<json_value>;
    using arr_traits = value_traits<json_array>;

    try
    {
      arr_traits::prepend (v, val_traits::convert (move (ns)));
    }
    catch (const invalid_argument& e)
    {
      // Note: ns is not guaranteed to be valid.
      //
      diag_record dr (fail);
      dr << "invalid json array";

      if (var != nullptr)
        dr << " in variable " << var->name;

      dr << ": " << e;
    }
  }

  const json_array value_traits<json_array>::empty_instance;
  const char* const value_traits<json_array>::type_name = "json_array";