Is there something like sizeof() ?

Question

I'd like to know how much memory a node or class takes.

Answer 1

Simply convert your node or class to a PoolByteArray

var sizeof = 0
for bit in var2bytes(node):
    sizeof += bit

Comments

I'm not sure if I am doing something wrong, but I always get the same results.

class Test:
    var a := 0

func _ready() -> void:
    var test := Test.new()
    var sizeof := 0
    for bit in var2bytes(test):
        sizeof += bit
    print(sizeof)

Output: 33

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class Test:
    var a := "Test"

func _ready() -> void:
    var test := Test.new()
    var sizeof := 0
    for bit in var2bytes(test):
        sizeof += bit
    print(sizeof)

Output: 33

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Interesting. seams like var2bytes was not incorrectly named

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Looks like it may be correct. So i did a test of your posted code
using File.store_var(entity) and File.get_len() and in both tests got the same filesize even when saving it to disk so this may be the best option.

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I will just mark this question as answered. Thanks for replying