There is no inheritance in V, but the language provides embedding through which composition can be expressed as an analogue of inheritance.
Embedded structs must come before all own struct fields.
With embedding, the struct
Button will automatically have get all the fields and methods from
Size, which allows you to do:
Unlike inheritance, you cannot type cast between structs and embedded structs (the embedding struct can also have its own fields, and it can also embed multiple structs).
If you need to access embedded structs directly, use an explicit reference like
Conceptually, embedded structs are similar to mixins in OOP, NOT base classes.
You can also initialize an embedded struct:
or assign values:
If multiple embedded structs have methods or fields with the same name, or if methods or fields
with the same name are defined in the struct, you can call methods or assign to variables in
the embedded struct like
When you do not specify the embedded struct name, the method of the outermost struct will be