Call an object method: Difference between revisions

module Animal

abstract type Animal end

abstract type Dog <: Animal end

abstract type Cat <: Animal end

struct Collie <: Dog

name::String

weight::Float64

end

struct Persian <: Cat

name::String

weight::Float64

end

# This function is static: it works on any dog, even on a blank instance, in

# the same way, to produce the same output for anything that isa Dog in type.

function soundalert(a::T) where T <: Dog

println("Woof!")

end

# This function depends on the class instance's data for its value, so this type

# of function is one way to do an instance method in Jula.

masskg(x) = x.weight