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docs: imrpove "Superpowers of the unit one" chapter

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Mateusz Pusz
2024-09-24 09:02:25 +02:00
parent 488572cbe0
commit 226118852f
1 changed files with 12 additions and 3 deletions
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docs/users_guide/framework_basics/dimensionless_quantities.md
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@@ -166,10 +166,11 @@ inline constexpr auto ppm = parts_per_million;
### Superpowers of the unit `one` ### Superpowers of the unit `one`
Quantities of the unit `one` are the only ones that are implicitly convertible from a raw value Quantities of the unit `one` are the only ones that are:
and explicitly convertible to it. This property also expands to usual arithmetic operators.
Thanks to the above, we can type: - implicitly constructible from the raw value,
- explicitly convertible to a raw value,
- comparable to a raw value.
```cpp ```cpp
quantity<one> inc(quantity<one> q) { return q + 1; } quantity<one> inc(quantity<one> q) { return q + 1; }
@@ -179,6 +180,14 @@ if (auto q = inc(42); q != 0)
legacy(static_cast<int>(q)); legacy(static_cast<int>(q));
``` ```
This property also expands to usual arithmetic operators.
!!! note
Those rules do not apply to all the dimensionless quantities. It would be unsafe and misleading
to allow such operations on units with a magnitude different than `1` (e.g., `percent` or
`radian`).
## Angular quantities ## Angular quantities