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subtypes

subtypes(T::DataType)

Return a list of immediate subtypes of DataType T. Note that all currently loaded subtypes are included, including those not visible in the current module.

Examples

julia> subtypes(Number)
2-element Array{Any,1}:
 Complex{T<:Real}
 Real

julia> subtypes(Int)
0-element Array{Any,1}

Here are some examples of how to use the subtypes function:

1. Get subtypes of Number:

   julia> subtypes(Number)
   4-element Array{Any,1}:
   Complex
   Real
   Integer
   AbstractFloat

   This example returns a list of subtypes of the Number abstract type, including Complex, Real, Integer, and AbstractFloat.

2. Find subtypes of a custom defined type:

   julia> abstract type Animal end
   julia> struct Dog <: Animal end
   julia> struct Cat <: Animal end
   julia> struct Bird <: Animal end
   
   julia> subtypes(Animal)
   3-element Array{Any,1}:
   Dog
   Cat
   Bird

   Here, we define an abstract type Animal, and three subtypes Dog, Cat, and Bird. Using subtypes(Animal) returns a list of these subtypes.

3. Get subtypes from a specific module:

   julia> using LinearAlgebra
   
   julia> subtypes(AbstractMatrix)
   4-element Array{Any,1}:
   Bidiagonal
   SymTridiagonal
   Tridiagonal
   Diagonal

   In this example, we load the LinearAlgebra module and find the subtypes of the AbstractMatrix type from that module.

It's important to note that the returned list includes all currently loaded subtypes, even those not visible in the current module.

Please note that the function subtypes returns an array of type Any, as the subtypes can be any type that is a subtype of the provided DataType.

See Also

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