What is the proper way to bind a struct without user-declared constructor?

[sjahr]

I am new to this library and I'd like to create bindings for a struct like this:

struct FrameTaskParams {
  double position_cost = 1.0;
  double orientation_cost = 1.0;
  double task_gain = 1.0;
  double lm_damping = 0.0;
};

Claude proposed to create the bindings like this:

  nanobind::class_<FrameTaskParams>(m, "FrameTaskParams")
      .def(nanobind::init<>())
      .def(
          "__init__",
          [](FrameTaskParams* self, double position_cost, double orientation_cost, double task_gain,
             double lm_damping) {
            new (self) FrameTaskParams{position_cost, orientation_cost, task_gain, lm_damping};
          },
          "position_cost"_a = 1.0, "orientation_cost"_a = 1.0, "task_gain"_a = 1.0,
          "lm_damping"_a = 0.0, "Constructor with custom parameters.")

Is there a better (maybe without a lambda) way to create bindings for the struct while keeping the option for to do Aggregate initialization for the struct in C++?

Thanks in advance for your help!

[wjakob]

Use .def(nb::init<type1, type2, ..>()). That will use aggregate initialization automatically.

[sjahr]

Wow that was super fast, thanks a lot for your answer!