improve construction and view performance (#224)

* improve construction performance

* check bounds only once in view()

* add test_throws

* bump version

Project.toml

@@ -1,6 +1,6 @@
 name = "StructArrays"
 uuid = "09ab397b-f2b6-538f-b94a-2f83cf4a842a"
-version = "0.6.5"
+version = "0.6.6"
 
 [deps]
 Adapt = "79e6a3ab-5dfb-504d-930d-738a2a938a0e"

src/structarray.jl

@@ -15,10 +15,10 @@ struct StructArray{T, N, C<:Tup, I} <: AbstractArray{T, N}
 
     function StructArray{T, N, C}(c) where {T, N, C<:Tup}
         if length(c) > 0
-            ax = axes(c[1])
+            ax = axes(first(c))
             length(ax) == N || error("wrong number of dimensions")
-            for i = 2:length(c)
-                axes(c[i]) == ax || error("all field arrays must have same shape")
+            map(tail(c)) do ci
+                axes(ci) == ax || error("all field arrays must have same shape")
             end
         end
         new{T, N, C, index_type(c)}(c)
@@ -347,7 +347,8 @@ Base.@propagate_inbounds function Base.getindex(x::StructArray{T, <:Any, <:Any,
 end
 
 @inline function Base.view(s::StructArray{T, N, C}, I...) where {T, N, C}
-    StructArray{T}(map(v -> view(v, I...), components(s)))
+    @boundscheck checkbounds(s, I...)
+    StructArray{T}(map(v -> @inbounds(view(v, I...)), components(s)))
 end
 
 Base.@propagate_inbounds function Base.setindex!(s::StructArray{<:Any, <:Any, <:Any, CartesianIndex{N}}, vals, I::Vararg{Int, N}) where {N}

test/runtests.jl

@@ -312,6 +312,8 @@ end
     @test pop!(t) == (1, 2.0)
     @test getproperty(t, 1) == [2]
     @test getproperty(t, 2) == [3.0]
+
+    @test_throws ErrorException StructArray(([1, 2], [3]))
 end
 
 @testset "constructor from slices" begin
@@ -350,6 +352,8 @@ end
     t2 = @inferred f2()
     @test t1 == StructArray((a=[1.2], b=["test"]))
     @test t2 == StructArray{Pair{Float64, String}}(([1.2], ["test"]))
+
+    @test_throws ErrorException StructArray(a=[1, 2], b=[3])
 end
 
 @testset "complex" begin