Add NTuple(f,n) syntax to construct Tuples

mbauman · Jun 20, 2015 · 38a3594 · 38a3594
1 parent f0e4d37
commit 38a3594
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diff --git a/src/implementation.jl b/src/implementation.jl
@@ -70,5 +70,8 @@ function concatenate{T<:Tuple, S<:Tuple}(::Type{T}, ::Type{S})
     Tuple{T.parameters..., S.parameters...}
 end
 
+## Allow constructing Tuples like tuples with NTuple (akin to ntuple)
+Base.call(::Type{NTuple}, f, n::Integer) = Tuple{ntuple(f, n)...}
+
 
 end # module
diff --git a/test/runtests.jl b/test/runtests.jl
@@ -85,3 +85,10 @@ gm = first(methods(g))
 @test Types.length(Tuple{Int8, Int16,Vararg{String}}) === 3
 @test Types.length(Tuple{Int8, Int16, Int32,Vararg{String}}) === 4
 @test Types.length(Tuple{Int8, Int16, Int32, Int64,Vararg{String}}) === 5
+
+
+# Test NTuple
+@test NTuple(i->Val{i}, 1) === Tuple{Val{1}}
+@test NTuple(i->Val{i}, 2) === Tuple{Val{1}, Val{2}}
+@test NTuple(i->Val{i}, 3) === Tuple{Val{1}, Val{2}, Val{3}}
+@test NTuple(i->Val{i}, 4) === Tuple{Val{1}, Val{2}, Val{3}, Val{4}}