Added copy{,to!}(::MulQuasiArray) and similar(::QuasiArrayMulArray) (#12)

* Added copy/copyto!(::MulQuasiArray)

* Added similar(::QuasiArrayMulArray)

Author: jagot

src/QuasiArrays/QuasiArrays.jl

@@ -1,7 +1,7 @@
 module QuasiArrays
 using Base, LinearAlgebra, LazyArrays
 import Base: getindex, size, axes, length, ==, isequal, iterate, CartesianIndices, LinearIndices,
-                Indices, IndexStyle, getindex, setindex!, parent, vec, convert, similar, zero,
+                Indices, IndexStyle, getindex, setindex!, parent, vec, convert, similar, copy, copyto!, zero,
                 map, eachindex, eltype, first, last, firstindex, lastindex, in
 import Base: @_inline_meta, DimOrInd, OneTo, @_propagate_inbounds_meta, @_noinline_meta,
                 DimsInteger, error_if_canonical_getindex, @propagate_inbounds, _return_type,

src/QuasiArrays/matmul.jl

@@ -200,6 +200,23 @@ function similar(A::MulQuasiArray)
     B*similar(a)
 end
 
+function similar(A::QuasiArrayMulArray)
+    B,a = A.args
+    applied(*, B, similar(a))
+end
+
+function copy(a::MulQuasiArray)
+    @_propagate_inbounds_meta
+    copymutable(a)
+end
+
+function copyto!(dest::MulQuasiArray, src::MulQuasiArray)
+    d = last(dest.applied.args)
+    s = last(src.applied.args)
+    copyto!(IndexStyle(d), d, IndexStyle(s), s)
+    dest
+end
+
 
 MemoryLayout(M::MulQuasiArray) = MulLayout(MemoryLayout.(M.applied.args))