Function with multiple arguments with all subsets of variables

General Usage
3

I think something like this

function one_func(x)
    # x nees to be iterable of bool
    return function(x1::AbstractVector)
        res = 1
        for (i, doit) in enumerate(x)
            if doit
                res += 2x1[i]^2
            end
        end
        res
    end
end

function func_factory(len)
    seed = ((false, true) for i in 1:len)
    collect(one_func(x) for x in Iterators.drop(Iterators.product(seed...),1))
end

funs = func_factory(2)
funs[1]([1, 2])
funs[2]([1, 2])
funs[3]([1, 2])


funs6 = func_factory(6)

[fun([1,2, 3, 4, 5, 6]) for fun in funs6]

You can also use macros for even better results. For this is sufficient for me.

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