Added copy

Author: Andy Ferris

src/StaticArrays.jl

@@ -7,7 +7,7 @@ import Base: @pure, @propagate_inbounds, getindex, setindex!, size, similar,
              broadcast, broadcast!, conj, transpose, ctranspose, hcat, vcat,
              ones, zeros, eye, one, cross, vecdot, reshape, fill, fill!, det,
              inv, eig, trace, vecnorm, norm, dot, diagm, sum, prod, count, any,
-             all, sumabs, sumabs2, minimum, maximum, extrema, mean
+             all, sumabs, sumabs2, minimum, maximum, extrema, mean, copy
 
 export StaticScalar, StaticArray, StaticVector, StaticMatrix
 export Scalar, SArray, SVector, SMatrix

src/abstractarray.jl

@@ -294,3 +294,22 @@ end
         return $newtype(a)
     end
 end
+
+# Clever ruse to determine if a type is "mutable"
+# Definitely *not* a deep copy.
+@generated function copy(a::StaticArray)
+    try
+        out = a()
+        return quote
+            $(Expr(:meta, :inline))
+            out = $(a)()
+            out .= a
+            return out
+        end
+    catch
+        return quote
+            $(Expr(:meta, :inline))
+            a
+        end
+    end
+end