Re: Size of inside out object

[temporal]

in reply to Size of inside out object

IIRC, you'll actually come out slightly ahead (use less memory) if you end up instantiating more objects than you have attributes.

In a classic object model each object will contain a hash of attributes. For inside-out objects you have a hash per attribute regardless of the number of objects.

[cheekuperl]

Say I have an object "car" with attributes color and speed.
Classical approach:
Car A = hash A with keys color and speed
Car B = hash B with keys color and speed

Inside out approach:
Car A = one hash for color, another for speed
Car B = one hash for color, another for speed

Which one will use less memory?

[BrowserUk]

For your given example, both will require two hashes, each with 2 of the 8 slots used. As near as make no difference, the memory usage will de identical for both.

However, lets say you have 10 instances of a class that has 2 attributes:

1. Classical: 10 hashes with 2 of 8 slots used ~ 80 hash slots + 20 scalars + 10 hash headers.
2. Inside out: 2 hashes each with 10 of 16 slots used ~ 32 hash slots + 20 scalars + 2 hash headers.

[cheekuperl]

Thanks! I'll have to research more, but I got what I needed to know!!