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Graph/8cf273e1-fe62-4773-bfb2-d7b76adf3aa0

Domainunvalidated

Polymorphism

8cf273e1-fe62-4773-bfb2-d7b76adf3aa0

Polymorphism

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Updated5/1/2026

PageRank0.0000

Effectiveness0.000

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23 linked nodes

PERTAIN_TOProblem

I can see all these types as components. Tension: I don't see any of the other types.

PERTAIN_TOSolution

Outcome: So the fact that it's declared on the parent is what's breaking it.

PERTAIN_TOAnswer

PERTAIN_TOProblem

From simply looking at the code, `get` giving an error is obvious to me. — raw type is used in `Sub extends Super`. Tension: For backward compatibility, Java allows a non-generic method in subclass to override a generic method in superclass as long as they have the same erasure. Outcome: `get` giving an error is obvious to me.

PERTAIN_TOSolution

you can fix the method parameter to something that's compatible (something broader) — `transform` compiles. Tension: They must be equal. Outcome: you can fix the method parameter to something that's compatible (something broader).

PERTAIN_TOAnswer

PERTAIN_TOSolution

if `m1` overrides `m2`, the signature of `m1` must be a subsignature of the signature of `m2` — For `R1` and `R2` that are reference types. Tension: `Object get()` is not return-type-substitutable for `T get()`.

PERTAIN_TOAnswer

PERTAIN_TOSolution

Create a forwarding Iterator<SuperClass> wrapper that delegates hasNext() and next() to the underlying Iterator<SubClass>

PERTAIN_TOSolution

Cast to raw Iterator if you accept unchecked warnings

PERTAIN_TOAnswer

PERTAIN_TOProblem

what if I want to require a user of my abstract base class to implement at least one out of several possible virtual methods? — sub-classing the `http_resource` object. Tension: the compiler enforce such a rule.

PERTAIN_TOSolution

you can instead template that function , and get access to `T` that way — If the user is supposed to construct those objects directly. Tension: there's a hack that makes it possible, but I doubt it's worth it.

PERTAIN_TOAnswer

PERTAIN_TOSolution

One way to achieve what you need, would be to remove the default empty implementations from `http_resource` — classes derived from it, that allow the user to implement only what they are interested in. Tension: implement only what they are interested in.

PERTAIN_TOAnswer

PERTAIN_TORootCause

Each processor has a `processData()` member function. Outcome: extracting each stage into separate member functions.

PERTAIN_TOProblem

I want to write unit tests for each stage of `processData()` independently, rather than testing the entire pipeline as one monolithic function. — using `std::variant` and `std::visit`. Tension: `processData()` is the common interface required for polymorphic behavior. Outcome: It is possible, naive approach would be to just define additional public methods.

PERTAIN_TOSolution

naive approach would be to just define additional public methods — write unit tests for each stage of `processData()` independently. Tension: the common interface required for polymorphic behavior. Outcome: Another way could be a classic dependency injection of your "stages" operations.

PERTAIN_TOAnswer

PERTAIN_TOProblem

not all types that `value` can hold support addition — I have a generic struct Node that holds any value.

PERTAIN_TOSolution

then you might use `std::visit` for the multi-dispatch. Tension: Not addable. Outcome: if constexpr (requires { t1 + t2; } ).

PERTAIN_TOAnswer

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