Fix checkbounds for trailing/missing dimensions.

Author: N5N3

src/Interpolations.jl

@@ -418,10 +418,12 @@ _checkbounds(::CheckWillPass, itp, x) = true
 _checkbounds(::NeedsCheck, itp, x) = checklubounds(lbounds(itp), ubounds(itp), x)
 
 checklubounds(ls, us, xs) = _checklubounds(true, ls, us, xs)
-_checklubounds(tf::Bool, ls, us, xs::Tuple{Number, Vararg{Any}}) =
-    _checklubounds(tf & (ls[1] <= xs[1] <= us[1]), Base.tail(ls), Base.tail(us), Base.tail(xs))
-_checklubounds(tf::Bool, ls, us, xs::Tuple{AbstractVector, Vararg{Any}}) =
+_checklubounds(tf::Bool, ls::Tuple, us::Tuple, xs::Tuple) =
     _checklubounds(tf & allbetween(ls[1], xs[1], us[1]), Base.tail(ls), Base.tail(us), Base.tail(xs))
+_checklubounds(tf::Bool, ::Tuple{}, ::Tuple{}, xs::Tuple) =
+    _checklubounds(tf & all(isone, xs[1]), (), (), Base.tail(xs))
+_checklubounds(tf::Bool, ls::Tuple, us::Tuple, ::Tuple{}) =
+    _checklubounds(tf & (ls[1] == us[1]), Base.tail(ls), Base.tail(us), ())
 _checklubounds(tf::Bool, ::Tuple{}, ::Tuple{}, ::Tuple{}) = tf
 
 maybe_clamp(itp, xs) = maybe_clamp(BoundsCheckStyle(itp), itp, xs)

src/utils.jl

@@ -98,14 +98,15 @@ function getindex!(dest, itp, xs::Vararg{AbstractArray,N}) where N
     return dest
 end
 
-function allbetween(l::Real, xs, u::Real)
+allbetween(l, x::Number, u) = (l <= x) & (x <= u)
+function allbetween(l, xs::AbstractVector, u)
     ret = true
     @inbounds for x in xs
-        ret = ret & (l <= x) & (x <= u)
+        ret = ret & allbetween(l, x, u)
     end
     return ret
 end
-allbetween(l::Real, xs::AbstractRange, u::Real) = (l <= minimum(xs)) & (maximum(xs) <= u)
+allbetween(l::Real, xs::AbstractRange{<:Real}, u::Real) = (l <= minimum(xs)) & (maximum(xs) <= u)
 
 allisreal(x) = _allisreal(true, x...)
 @inline _allisreal(ret, x1::Real, xs...) = _allisreal(ret, xs...)

test/core.jl

@@ -79,3 +79,12 @@ end
     @test (@inferred eltype(itp)) == Float64
     @test (@inferred ndims(itp)) == 1
 end
+
+@testset "checkbounds" begin
+    itp = interpolate(randn(2,2,1), (BSpline(Linear()), BSpline(Linear()), NoInterp()))
+    @test !Base.checkbounds(Bool, itp, 1)
+    @test Base.checkbounds(Bool, itp, 1, 1)
+    @test Base.checkbounds(Bool, itp, 1, 1, 1)
+    @test Base.checkbounds(Bool, itp, 1, 1, 1, 1)
+    @test !Base.checkbounds(Bool, itp, 1, 1, 1, 1, 2)
+end