Why extensions cannot add stored properties

Question

Quoting the Swift Programming Language Guide :

Extensions can add new computed properties, but they cannot add stored properties, or add property observers to existing properties.

Why is that ? What's the technical or logical reason behind this ?

Prashant Tukadiya · Accepted Answer · 2018-02-15T11:48:43.223

3

In simple words

Because properties need storage, adding properties would change the memory structure of the class

edited Feb 15 '18 at 11:48

answered Feb 15 '18 at 11:41

Prashant Tukadiya

4

Where did you get the quote from ? – Ambroise Collon Feb 15 '18 at 14:18
But first of all compiler compute the value of computed properties then all other stored properties and conputed properties get memory – JeeVan TiWari Feb 01 '19 at 01:57

1 Answers1