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Widening-based map() to remove return_type #1

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34 changes: 29 additions & 5 deletions src/mapreduce.jl
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Original file line number Diff line number Diff line change
@@ -1,8 +1,32 @@
function Base.map(f, a::StaticArrayLite)
T = Core.Compiler.return_type(f, Tuple{eltype(a)})
out = similar(a, T, size(a))
map!(f, out, a)
return freeze(out)
if length(a) == 0
T = Core.Compiler.return_type(f, Tuple{eltype(a)})
return freeze(similar(a, T, size(a)))
end
@inbounds x = f(a[first(LinearIndices(a))])
out = similar(a, typeof(x), size(a))
freeze(_map_widen!(out, 0, x, f, a))
end

function _map_widen!(out, offset, x, f, a)
a_i1 = first(LinearIndices(a))
out_i1 = first(LinearIndices(out))
T = eltype(out)
while true
@inbounds out[out_i1+offset] = x
offset += 1
if offset >= length(a)
break
end
@inbounds x = f(a[a_i1+offset])
if !(typeof(x) === T || x isa T)
T2 = Base.promote_typejoin(T, typeof(x))
out2 = similar(a, T2, size(a))
copyto!(out2, out_i1, out, out_i1, offset)
return _map_widen!(out2, )
end
end
return out
end

function Base.map(f, a::StaticArrayLite, b::StaticArrayLite)
Expand Down Expand Up @@ -44,4 +68,4 @@ function Base.mapreduce(f, op, a::StaticArrayLite, b::StaticArrayLite; init)
out = op(f(@inbounds(a[i]),@inbounds(b[i])), out)
end
return out
end
end