Why is extending builtin classes not allowed?

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,
1

Godot Version

V4

Question

Does anyone know why I cannot extend built in classes like String or Array.

For example if I want to make my own inner class and extend from String, I would not be allowed to do it. Any alternatives if I want to do it.

Builtins like Array or String is not allowed

class Result extends Array:
	var error_code: int=0
	var error_description: String=""

	func to_string2()->String:
		return "somevalue"

This is allowed

class Result extends Object:
	var error_code: int=0
	var error_description: String=""
	
	func to_string2()->String:
		return "somevalue"
2

Not a pro at this, but I’ll have to guess that it’s because they are implemented in C++ and compiled with the engine.

I’d work around this by just making an Array variable and manipulating it how I want within the class. It’s not as pretty as just not having to type in that extra variable, but it does its job.

3

String and Array are not classes. They’re types, which cannot be extended the way classes can.

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