Hands-On Design Patterns and Best Practices with Julia

Designing composite types

Composite types are defined with the struct keyword. Let's carry on the example from the preceding abstract type section and continue building our personal asset type hierarchy. We will now create a concrete type called Stock as a subtype of Equity. To keep things simple, we will just represent a stock as a trading symbol and the name of the company:

struct Stock <: Equity    symbol::String    name::Stringend

We can instantiate a composite type using the standard constructor, which just takes all the fields as an argument:

Now, since Stock is a subtype of Equity, which is a subtype of Investment, which in turn is a subtype ...