infer constructors and add test for it

Author: KristofferC

.travis.yml

@@ -2,9 +2,9 @@
 language: julia
 os:
   - linux
-  #- osx
+  - osx
 julia:
-  #- 0.6
+  - 1.0
   - nightly
 notifications:
   email: false

src/structarray.jl

@@ -41,10 +41,13 @@ end
 
 setindex!(s::StructArray, val, I::Int...) = set_ith!(s, val, I...)
 
-fields(T) = fieldnames(T)
 fields(::Type{<:NamedTuple{K}}) where {K} = K
 fields(::Type{<:StructArray{T}}) where {T} = fields(T)
 
+@generated function fields(t::Type{T}) where {T}
+   return :($(Expr(:tuple, [QuoteNode(f) for f in fieldnames(T)]...)))
+end
+
 @generated function push!(s::StructArray{T, 1}, vals) where {T}
     args = []
     for key in fields(T)

test/runtests.jl

@@ -26,8 +26,13 @@ end
     @test t == StructArray{Pair}([3, 5, 2, 3, 5, 2], ["a", "b", "c", "a", "b", "c"])
     t = StructArray{Pair}([3, 5], ["a", "b"])
     t2 = StructArray{Pair}([1, 6], ["a", "b"])
-    @test cat(1, t, t2) == StructArray{Pair}([3, 5, 1, 6], ["a", "b", "a", "b"]) == vcat(t, t2)
+    @test cat(t, t2; dims=1) == StructArray{Pair}([3, 5, 1, 6], ["a", "b", "a", "b"]) == vcat(t, t2)
     @test vcat(t, t2) isa StructArray
-    @test cat(2, t, t2) == StructArray{Pair}([3 1; 5 6], ["a" "a"; "b" "b"]) == hcat(t, t2)
+    @test cat(t, t2; dims=2) == StructArray{Pair}([3 1; 5 6], ["a" "a"; "b" "b"]) == hcat(t, t2)
     @test hcat(t, t2) isa StructArray
 end
+
+f_infer() = StructArray{ComplexF64}(rand(2,2), rand(2,2))
+@testset "inferrability" begin
+    @inferred f_infer()
+end