NamedTuple constructor for iterables (#26914)

JuliaLang · May 30, 2018 · 23da960 · 23da960
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diff --git a/base/namedtuple.jl b/base/namedtuple.jl
@@ -89,6 +89,9 @@ function NamedTuple{names}(nt::NamedTuple) where {names}
  end
 end
 
+NamedTuple{names, T}(itr) where {names, T <: Tuple} = NamedTuple{names, T}(T(itr))
+NamedTuple{names}(itr) where {names} = NamedTuple{names}(Tuple(itr))
+
 end # if Base
 
 length(t::NamedTuple) = nfields(t)

diff --git a/test/namedtuple.jl b/test/namedtuple.jl
@@ -236,3 +236,7 @@ y = map(v -> (a=v.a, b=v.a + v.b), [(a=1, b=missing), (a=1, b=2)])
 # issue #27187
 @test reduce(merge,[(a = 1, b = 2), (c = 3, d = 4)]) == (a = 1, b = 2, c = 3, d = 4)
 @test typeintersect(NamedTuple{()}, NamedTuple{names, Tuple{Int,Int}} where names) == Union{}
+
+# Iterator constructor
+@test NamedTuple{(:a, :b), Tuple{Int, Float64}}(Any[1.0, 2]) === (a=1, b=2.0)
+@test NamedTuple{(:a, :b)}(Any[1.0, 2]) === (a=1.0, b=2)