allow == for two groups/group elements in fewer cases
#4196
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If `_check_compatible` for the two groups in question returns `false` then throw an exception. Note that the result is not based only on the types of the arguments but also on the groups.
lgoettgens
reviewed
Oct 11, 2024
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| # For two `GAPGroupElem`s, | ||
| # if no specialized method is applicable then no `==` comparison is allowed. | ||
| function ==(x::GAPGroupElem, y::GAPGroupElem) | ||
| _check_compatible(parent(x), parent(y); error = false) || throw(ArgumentError("parents of x and y are not compatible")) | ||
| throw(ArgumentError("== is not implemented for the given types")) | ||
| end |
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once Nemocas/AbstractAlgebra.jl#1853 is available, this method can be removed. maybe add this as a comment
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My point of view is:
If the compatibility check returns false then we are sure that the question for == is not allowed,
but if the compatibility check returns true then likely there is a new subtype of GAPGroupElem for which a == method should be provided.
(Currently we have just the subtypes BasicGAPGroupElem and MatrixGroupElem.)
lgoettgens
reviewed
Oct 11, 2024
| # For two `GAPGroupElem`s, | ||
| # if no specialized method is applicable then no `==` comparison is allowed. | ||
| function ==(x::GAPGroupElem, y::GAPGroupElem) | ||
| _check_compatible(parent(x), parent(y); error = false) || throw(ArgumentError("parents of x and y are not compatible")) |
fingolfin
approved these changes
Oct 15, 2024
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If
_check_compatiblefor the two groups in question returnsfalsethen throw an exception.Note that the result is not based only on the types of the arguments but also on the groups.
This addresses one of the questions from #4191.