Dispatch on Type

General Usage
1

I am hoping to create a function that will dispatch on the type I put in. Basically the function will look at the fields of the structure and do things based on the number of fields and the fieldnames. As a MWE I would like to be able to print the type. I show a few tries here

julia> Complex <: Number
true

julia> function foo(type::Number)
           println(type)
       end
foo (generic function with 2 methods)

julia> foo(Complex)
ERROR: MethodError: no method matching foo(::Type{Complex})
Closest candidates are:
  foo(::Real) at REPL[9]:1
  foo(::Number) at REPL[11]:1
Stacktrace:
 [1] top-level scope
   @ REPL[12]:1


julia> function foo(type::T) where T<:Number
           println(type)
       end
foo (generic function with 2 methods)

julia> foo(ComplexF64)
ERROR: MethodError: no method matching foo(::Type{ComplexF64})
Closest candidates are:
  foo(::Real) at REPL[2]:1
  foo(::T) where T<:Number at REPL[5]:1
Stacktrace:
 [1] top-level scope
   @ REPL[6]:1

Is this possible? How would I do it?

Thanks in advance!

2

You want foo(type::Type{T}) where T<:Number