Add zero(::Type{<:SDiagonal}) (#905)

* Add zero(::Type{<:SDiagonal})

* version bump to v1.1.3

Author: jishnub

Project.toml

@@ -1,6 +1,6 @@
 name = "StaticArrays"
 uuid = "90137ffa-7385-5640-81b9-e52037218182"
-version = "1.1.2"
+version = "1.1.3"
 
 [deps]
 LinearAlgebra = "37e2e46d-f89d-539d-b4ee-838fcccc9c8e"

src/SDiagonal.jl

@@ -39,6 +39,7 @@ one(::Type{SDiagonal{N,T}}) where {N,T} = SDiagonal(ones(SVector{N,T}))
 one(::SDiagonal{N,T}) where {N,T} = SDiagonal(ones(SVector{N,T}))
 
 Base.zero(::SDiagonal{N,T}) where {N,T} = SDiagonal(zeros(SVector{N,T}))
+Base.zero(::Type{SDiagonal{N,T}}) where {N,T} = SDiagonal(zeros(SVector{N,T}))
 
 function LinearAlgebra.cholesky(D::SDiagonal)
     any(x -> x < 0, D.diag) && throw(LinearAlgebra.PosDefException(1))

test/SDiagonal.jl

@@ -111,5 +111,8 @@ using StaticArrays, Test, LinearAlgebra
         @test m*SMatrix{4,4}(Matrix{Float64}(I, 4, 4)) == m
         @test SMatrix{4,4}(Matrix{Float64}(I, 4, 4))/m == diagm(0 => [11; 12; 13; 14].\[1; 1; 1; 1])
         @test m\SMatrix{4,4}(Matrix{Float64}(I, 4, 4)) == diagm(0 => [11; 12; 13; 14].\[1; 1; 1; 1])
+
+        @test m + zero(m) == m
+        @test m + zero(typeof(m)) == m
     end
 end