I can't ClassDB::bind_method/D_METHOD one function, others are fine

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:bust_in_silhouette: Asked By capt_sms

This is my function in my C++ Godot module:

using siz = std::size_t;
bool WallyController::w_init(String path, siz wcnoL, siz wcnoR, bool median = false, bool sgbm = false, siz boardw = 1920, siz boardh = 1080, bool rightcam = false, siz camw = 640, siz camh = 480, siz workw = 640, siz workh = 480);

This is my WallyController::_bind_methods():

ClassDB::bind_method(D_METHOD("checkInit"), &WallyController::w_checkInit);
ClassDB::bind_method(D_METHOD("tick"), &WallyController::w_tick);
ClassDB::bind_method(D_METHOD("takeKeypoints", "raw"), &WallyController::w_takeKeypoints, DEFVAL(false));
ClassDB::bind_method(D_METHOD("takeMedian"), &WallyController::w_takeMedian);

ClassDB::bind_method(D_METHOD("init", "path", "wcnoL", "wcnoR", 
    "median", "sgbm", "boardw", "boardh", "rightcam", "camw", "camh", 
    "workw", "workh"), &WallyController::w_init, DEFVAL(480), DEFVAL(640), DEFVAL(false), 
    DEFVAL(480), DEFVAL(640), DEFVAL(1080), DEFVAL(1920));

There are less DEFVALs than C++ default values only because it allows for 8 only. Is there an upper limit of arguments too? Debugger allows for the code, but then I get a build error:

./core/class_db.h: In instantiation of 'static MethodBind* ClassDB::bind_method(N, M) [with N = MethodDefinition; M = bool (WallyController::*)(String, long unsigned int, long unsigned int, bool, bool, long unsigned int, long unsigned int, bool, long unsigned int, long unsigned int, long unsigned int, long unsigned int)]':
/home/sms/Code/WallieController/godot_modules/wallycontroller/wallycontroller.cpp:123:25:   required from here
./core/class_db.h:225:54: error: no matching function for call to 'create_method_bind(bool (WallyController::*&)(String, long unsigned int, long unsigned int, bool, bool, long unsigned int, long unsigned int, bool, long unsigned int, long unsigned int, long unsigned int, long unsigned int))'
  225 |                 MethodBind *bind = create_method_bind(p_method);

I’ve tried w/o DEFVALs at all, but it’s the same error. It’s always the “init” method, other functions are working.

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:bust_in_silhouette: Reply From: einsteinx2

In the docs it says:

There is a parameter limit of 5 in C++ modules for things such as subclasses. This can be raised to 13 by including the header file core/method_bind_ext.gen.inc.

I am not totally clear if that applies in this situation, but since if you’re exposing this object to GDScript, it must be a subclass of Godot’s classes, so I assume it applies.

It’s on this docs page: Custom modules in C++ — Godot Engine (stable) documentation in English