transferred StaticArrays option

Project.toml

@@ -12,6 +12,7 @@ julia = "1"
 
 [extras]
 Test = "8dfed614-e22c-5e08-85e1-65c5234f0b40"
+StaticArrays = "90137ffa-7385-5640-81b9-e52037218182"
 
 [targets]
 test = ["Test"]

README.md

@@ -16,6 +16,8 @@ The package also provides some concrete static vector types: `Values` which may
 Mutable versions `Variables` are also exported, as well
 as `FixedVector` for annotating standard `Vector`s with static size information.
 
+If the environment variable `STATICJL` is set, then `StaticArrays` is loaded instead.
+
 ### Quick start
 
 Add *StaticVectors* from the [Pkg REPL](https://docs.julialang.org/en/latest/stdlib/Pkg/#Getting-Started-1), i.e., `pkg> add StaticVectors`. Then:

src/StaticVectors.jl

@@ -19,6 +19,11 @@ export TupleVector, Values, Variables, FixedVector
 
 import Base: @propagate_inbounds, @_inline_meta, @pure
 
+if haskey(ENV,"STATICJL")
+    import StaticArrays: SVector, MVector, SizedVector, StaticVector, _diff
+    const Values,Variables,FixedVector,TupleVector = SVector,MVector,SizedVector,StaticVector
+else
+
 abstract type TupleVector{N,T} <: AbstractVector{T} end
 
 # Being a member of TupleMatrixLike or TupleVectorLike implies that Val(A)
@@ -57,6 +62,8 @@ include("linalg.jl")
 
 const SVector,MVector,SizedVector = Values,Variables,FixedVector
 
+end
+
 @pure countvalues(a::Int,b::Int) = Values{max(0,b-a+1),Int}(a:b...)
 @pure evenvalues(a::Int,b::Int) = Values{((b-a)÷2)+1,Int}(a:2:b...)