Views of weights do not work well

[oxinabox]

Views of weights are not <:AbstractWeight
They are only <:AbstractVector

This messes with some dispatches.

For example:

julia> w = eweights(20,0.3);

julia> mean(1:10, w[1:10])
7.957353087579495

julia> mean(1:10, @view w[1:10])
ERROR: MethodError: objects of type UnitRange{Int64} are not callable

julia> mean_and_std(1:10, @view w[1:10])
ERROR: MethodError: no method matching mean_and_std(::UnitRange{Int64}, ::SubArray{Float64,1,Weights{Float64,Float64,Array{Float64,1}},Tuple{UnitRange{Int64}},false})

Work-around is to use:
AnalyticWeights(@view w[1:10])

A possible solution is to overload the functions the create views and make then return subtypes of AbstractWeight

[nalimilan]

For views to be AbstractWeights, we will need not only to override view, but also to allow each AbstractWeights type to wrap any kind of array (including SubArray).

[ParadaCarleton]

Closed as duplicate.