move maybetail to this package (#219)

* move maybetail to this package

* version bump to v0.16.20

* add indexing test

Author: jishnub

Project.toml

@@ -1,6 +1,6 @@
 name = "BlockArrays"
 uuid = "8e7c35d0-a365-5155-bbbb-fb81a777f24e"
-version = "0.16.19"
+version = "0.16.20"
 
 [deps]
 ArrayLayouts = "4c555306-a7a7-4459-81d9-ec55ddd5c99a"

src/BlockArrays.jl

@@ -24,14 +24,16 @@ import Base: @propagate_inbounds, Array, to_indices, to_index,
             getindex, ndims, show,
             step,
             broadcast, eltype, convert, similar,
-            @_inline_meta, _maybetail, tail, @_propagate_inbounds_meta, reindex,
+            @_inline_meta, tail, @_propagate_inbounds_meta, reindex,
             RangeIndex, Int, Integer, Number,
             +, -, *, /, \, min, max, isless, in, copy, copyto!, axes, @deprecate,
             BroadcastStyle, checkbounds, throw_boundserror,
             ones, zeros, intersect, Slice, resize!
 using Base: ReshapedArray, dataids
 import Base: AbstractArray
 
+_maybetail(::Tuple{}) = ()
+_maybetail(t::Tuple) = tail(t)
 
 import Base: (:), IteratorSize, iterate, axes1, strides, isempty
 import Base.Broadcast: broadcasted, DefaultArrayStyle, AbstractArrayStyle, Broadcasted, broadcastable

test/test_blockarrays.jl

@@ -181,6 +181,7 @@ end
             a[1] = 2
             @test a == [2,2,3]
             @test a_data == [1,2,3]
+            @test a[Block(1), 1] == a[Block(1)] == [2]
             a = BlockVector(a_data,(blockedrange([1,2]),))
             a[1] = 2
             @test a == [2,2,3]