function foo(gridsize, padsize, activated::Array{Bool,N}) where {N}
for k=1:N
g=gridsize[k]
p=padsize[k]
pref = ntuple(i->Colon(), k-1)
suff = ntuple(i->Colon(), N-k)
v=view(activated, pref..., g+1:p, suff...)
v .= false
end
end
If this is too slow, you might need to become @generated 