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Turn zzModRing & ZZModRing into ResidueRing subtypes #1819

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Since the element types of these ring types are subtypes of ResElem, the
rings should be subtypes of ResidueRing. Otherwise some generic code
gets confused (notably check_parent for ResElem).

This lead to a wrong error in the OSCAR book's introduction notebook.

@joschmitt
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I'm sorry! Obviously, I didn't check this carefully enough yesterday evening.

Since the element types of these ring types are subtypes of ResElem, the
rings should be subtypes of ResidueRing. Otherwise some generic code
gets confused (notably check_parent for ResElem).

This lead to a wrong error in the OSCAR book's introduction notebook.
@fingolfin
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Hrm, this changes messes up the rand delegation, which already is a mess in itself... sigh.

@@ -410,7 +410,7 @@ The ring $\mathbb Z/n\mathbb Z$ for some $n$. See [`residue_ring`](@ref).
Implementation for the modulus being a machine integer [`Int`](@ref).
For the modulus being a [`ZZRingElem`](@ref) see [`ZZModRing`](@ref).
"""
@attributes mutable struct zzModRing <: Ring
@attributes mutable struct zzModRing <: ResidueRing{UInt}
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I would argue that this should also be ResidueRing{ZZRingElem}?

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Well we have

julia> supertypes(zzModRingElem)
(zzModRingElem, ResElem{UInt64}, RingElem, NCRingElem, SetElem, Any)

and these should match, I think?

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@thofma thofma Jul 8, 2024

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makes sense, unfortunately

@fingolfin fingolfin closed this Oct 4, 2024
@fingolfin fingolfin reopened this Oct 4, 2024
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3 participants