text: /*************************************************************************/
  /*  func_ref.cpp                                                         */
  /*************************************************************************/
  /*                       This file is part of:                           */
  /*                           GODOT ENGINE                                */
  /*                      https://godotengine.org                          */
  /*************************************************************************/
  /* Copyright (c) 2007-2020 Juan Linietsky, Ariel Manzur.                 */
  /* Copyright (c) 2014-2020 Godot Engine contributors (cf. AUTHORS.md).   */
  /*                                                                       */
  /* Permission is hereby granted, free of charge, to any person obtaining */
  /* a copy of this software and associated documentation files (the       */
  /* "Software"), to deal in the Software without restriction, including   */
  /* without limitation the rights to use, copy, modify, merge, publish,   */
  /* distribute, sublicense, and/or sell copies of the Software, and to    */
  /* permit persons to whom the Software is furnished to do so, subject to */
  /* the following conditions:                                             */
  /*                                                                       */
  /* The above copyright notice and this permission notice shall be        */
  /* included in all copies or substantial portions of the Software.       */
  /*                                                                       */
  /* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,       */
  /* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF    */
  /* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.*/
  /* IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY  */
  /* CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,  */
  /* TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE     */
  /* SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.                */
  /*************************************************************************/
  
  #include "func_ref.h"
  
  Variant FuncRef::call_func(const Variant **p_args, int p_argcount, Variant::CallError &r_error) {
  
  	if (id == 0) {
  		r_error.error = Variant::CallError::CALL_ERROR_INSTANCE_IS_NULL;
  		return Variant();
  	}
  	Object *obj = ObjectDB::get_instance(id);
  
  	if (!obj) {
  		r_error.error = Variant::CallError::CALL_ERROR_INSTANCE_IS_NULL;
  		return Variant();
  	}
  
  	return obj->call(function, p_args, p_argcount, r_error);
  }
  
  Variant FuncRef::call_funcv(const Array &p_args) {
  
  	ERR_FAIL_COND_V(id == 0, Variant());
  
  	Object *obj = ObjectDB::get_instance(id);
  
  	ERR_FAIL_COND_V(!obj, Variant());
  
  	return obj->callv(function, p_args);
  }
  
  void FuncRef::set_instance(Object *p_obj) {
  
  	ERR_FAIL_NULL(p_obj);
  	id = p_obj->get_instance_id();
  }
  
  void FuncRef::set_function(const StringName &p_func) {
  
  	function = p_func;
  }
  
  bool FuncRef::is_valid() const {
  	if (id == 0)
  		return false;
  
  	Object *obj = ObjectDB::get_instance(id);
  	if (!obj)
  		return false;
  
  	return obj->has_method(function);
  }
  
  void FuncRef::_bind_methods() {
  
  	{
  		MethodInfo mi;
  		mi.name = "call_func";
  		std::vector<Variant> defargs;
  		ClassDB::bind_vararg_method(METHOD_FLAGS_DEFAULT, "call_func", &FuncRef::call_func, mi, defargs);
  	}
  
  	ClassDB::bind_method(D_METHOD("call_funcv", "arg_array"), &FuncRef::call_funcv);
  
  	ClassDB::bind_method(D_METHOD("set_instance", "instance"), &FuncRef::set_instance);
  	ClassDB::bind_method(D_METHOD("set_function", "name"), &FuncRef::set_function);
  	ClassDB::bind_method(D_METHOD("is_valid"), &FuncRef::is_valid);
  }
  
  FuncRef::FuncRef() :
  		id(0) {
  }
  