What is wrong with this code?

[gnif 1]

Hi All,

I am attempting to create a nice little framework for overriding/extnding pre compiled functions, which I cant seem to get to work properly.

overrideMethod =
{
 private ["_oldFn", "_list", "_params", "_result", "_handled"];

 _oldFn   = _this select 0;
 _list    = _this select 1;
 _params  = _this select 2;
 _handled = false;

 {
   // call the method
   _result = _params call _x;

   // check if the call has been handled
   if ((_result select 0)) exitWith {
     _handled = true;
     _result  = _result select 1;
   };
 }
 forEach _list;

 if (!_handled) then {
   _result = _params call _oldFn;
 };

 _result
};

// method overrides
if (!isNil "fnc_usec_selfActions") then
{
 fnc_usec_selfActionsOrig = fnc_usec_selfActions;
 fnc_usec_selfActionsList = [];
 fnc_usec_selfActions     = { private ["_result"]; _result = [fnc_usec_selfActionsOrig, fnc_usec_selfActionsList, _this] call overrideMethod; _result };

 // this looks strange here, but it is here because this code is generated dynamically by a patching API.
 fnc_usec_selfActionsList set [count fnc_usec_selfActionsList, compile preprocessFileLineNumbers "extended.sqf"];
};

I am getting the following error (client side only).

Error in expression <h _list;

if (!_handled) then {
_result = _params call _oldFn;
};

_result
};


>
 Error position: <= _params call _oldFn;
};

_result
};


>
 Error Generic error in expression
File mpmissions\__CUR_MP.Chernarus\overrides.sqf, line 23

I do not understand what is wrong here. It seems if I put a diagLog "Testing"; before calling _oldFn it fixes the issue.

[gnif 1]

I found the problem...

fnc_usec_selfActions does not return anything, so _result = _params call fnc_usec_selfActions fails. Would have been nice