void set_error()

in include/unifex/let_error.hpp [100:128]

• 27 lines of code
• 2 McCabe index (conditional complexity)

  void set_error(ErrorValue e) noexcept {
    UNIFEX_ASSERT(op_ != nullptr);
    auto op = op_;  // preserve pointer value.

    using final_sender_t = callable_result_t<Func, ErrorValue>;
    using final_op_t =
        unifex::connect_result_t<final_sender_t, final_receiver<ErrorValue>>;

    UNIFEX_TRY {
      scope_guard destroyPredOp = [&]() noexcept {
        unifex::deactivate_union_member(op->sourceOp_);
      };
      auto& err = op->error_.template construct<ErrorValue>((ErrorValue &&) e);
      destroyPredOp.reset();
      scope_guard destroyErr = [&]() noexcept {
        op->error_.template destruct<ErrorValue>();
      };
      auto& finalOp =
          unifex::activate_union_member_with<final_op_t>(op->finalOp_, [&] {
            return unifex::connect(
                std::move(op->func_)(err), final_receiver<ErrorValue>{op});
          });
      unifex::start(finalOp);
      destroyErr.release();
    }
    UNIFEX_CATCH(...) {
      unifex::set_error(std::move(op->receiver_), std::current_exception());
    }
  }