Which unique show to use for nested and non-nested structures?

[dpsanders]

In the following example, we see that defining the 3-argument form of show is required to change the output of a type, but the 2-argument form must also be explicitly defined to get the desired behaviour inside another data structure (e.g. an array). cc @shashi

julia> using StaticArrays

julia> Base.show{N,T}(io::IO, ::MIME"text/plain", vec::SVector{N,T}) = print(io, "Hello")
show (generic function with 203 methods)

julia> SVector(1,2)
Hello

julia> [SVector(1,2,3)]
1-element Array{StaticArrays.SVector{3,Int64},1}:
 [1,2,3]

julia> Base.show{N,T}(io::IO, vec::SVector{N,T}) = print(io, "Hello")
show (generic function with 204 methods)

julia> [SVector(1,2,3)]
1-element Array{StaticArrays.SVector{3,Int64},1}:
 Hello

Also,

julia> immutable X x end

julia> X(SVector(2,2))
X(Hello)

[shashi]

For another ugly situation created by show(IOContext, x) methods see: JuliaLang/IJulia.jl#509

[laborg]

This works now. (See clarification for container types in #36076)

julia> using StaticArrays

julia> Base.show(io::IO, ::MIME"text/plain", vec::SVector{N,T}) where{N,T}  = print(io, "Hello")

julia> SVector(1,2)
Hello

julia> [SVector(1,2,3)]
1-element Vector{SVector{3, Int64}}:
 Hello