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docs: "Should we get rid of a quantity_point?" chapter extended with an alternative solution

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Mateusz Pusz
2025-01-17 12:15:50 +01:00
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docs/blog/posts/bringing-quantity-safety-to-the-next-level.md
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@ -639,13 +639,22 @@ to know the context in which the `quantity_spec` is being used. This sucks!
### Should we get rid of a `quantity_point`?
A solution to the above might be removing a dedicated `quantity_point` abstraction and providing both
functionalities through the `quantity` class template. In order to determine if we are dealing with
a "delta" or "point", we would need a special wrapper around the `QuantityReference` and
`quantity_spec`.
There are at least two ways of solving the above issue. In any case, we need to introduce a wrapper
over the `quantity_spec` to denote it is being used in a "point" abstraction.
I still haven't figured out the best syntax. Please let me know if you have good ideas in the
comments below. Here are some rough ideas:
A simpler solution could be implicitly amending the `Reference` provided to the `quantity_point`
class template with `point<...>`. So, for example, we would have the following members in
`quantity_point<isq::altitude[m]>`:
- `qp::quantity_spec == point<isq::altitude>`,
- `qp::reference` of a type `reference<point<isq::altitude>, si::metre>`.
This should work but might be a bit confusing as members of the class template would not exactly
contain the types of template parameters.
A better solution might be removing a dedicated `quantity_point` abstraction and providing both
functionalities through the `quantity` class template. I still haven't figured out the best syntax.
Please let me know if you have good ideas in the comments below. Here are some rough ideas:
| Before | After | `quantity_spec` |
|----------------------------------------------------|-----------------------------------------------------|-------------------------------|