enable rand(NTuple{N})::NTuple{N,Float})

Author: rfourquet

src/sampling.jl

@@ -157,7 +157,13 @@ end
 # and       make(NTuple{N}, S)
 
 @generated function _make(::Type{T}, args...) where T <: Tuple
-    isempty(args) && return :(Make0{$(T === Tuple ? Tuple{} : T)}())
+    if isempty(args)
+        TT = T === Tuple ? Tuple{} :
+            T === NTuple ? Tuple{} :
+            T isa UnionAll && Type{T} <: Type{NTuple{N}} where N ? T{default_sampling(Tuple)} :
+            T
+        return :(Make0{$TT}())
+    end
     isNT = length(args) == 1 && T !== Tuple && (
         T <: NTuple || !isa(T, UnionAll)) # !isa(Tuple, UnionAll) !!
 

test/runtests.jl

@@ -188,6 +188,9 @@ const spString = Sampler(MersenneTwister, String)
     @test all(in(1:3), s)
     s = rand(rng..., Tuple, 4)
     @test s isa NTuple{4,Float64}
+
+    s = rand(rng..., NTuple{3})
+    @test s isa NTuple{3,Float64}
 end
 
 @testset "Rand" for rng in ([], [MersenneTwister(0)], [RandomDevice()])
@@ -303,6 +306,9 @@ end
     r = rand(make(Tuple{AbstractFloat,Integer}, 1:3))
     @test r isa Tuple{Float64,Int64}
     @test all(in(1:3), r)
+
+    r = rand(make(NTuple{3}))
+    @test r isa NTuple{3,Float64}
 end
 
 @testset "rand(make(String, ...))" begin