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docs: "Changes to units definitions" chapter reordered in TOC in the 2.2 release announcement

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Mateusz Pusz
2024-03-03 17:20:04 +01:00
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@@ -165,6 +165,27 @@ With this release, the last one was renamed to `usc::zeroth_degree_Fahrenheit` t
named with its corresponding unit and with the `si::zeroth_degree_Celsius` (**breaking change**). named with its corresponding unit and with the `si::zeroth_degree_Celsius` (**breaking change**).
## Changes to units definitions
[WG21 Study Group 16 (Unicode) raised concerns](https://github.com/sg16-unicode/sg16-meetings#january-24th-2024)
about potential ABI issues when different translation units are compiled with different ordinary
literal encodings. Those issues were resolved with a change to units definitions (**breaking
change**). It affects only units that specify both Unicode and ASCII symbols. The new design
requires the Unicode symbol to be provided as a UTF-8 literal:
=== "Now"
```cpp
inline constexpr struct ohm : named_unit<{u8"Ω", "ohm"}, volt / ampere> {} ohm;
```
=== "Before"
```cpp
inline constexpr struct ohm : named_unit<{"Ω", "ohm"}, volt / ampere> {} ohm;
```
## Improved text output ## Improved text output
With this release we can print not only whole quantities but also just their units or dimensions. With this release we can print not only whole quantities but also just their units or dimensions.
@@ -214,27 +235,6 @@ Also, we have finally added proper implementations of `value_cast` and `quantity
quantity points. quantity points.
## Changes to units definitions
[WG21 Study Group 16 (Unicode) raised concerns](https://github.com/sg16-unicode/sg16-meetings#january-24th-2024)
about potential ABI issues when different translation units are compiled with different ordinary
literal encodings. Those issues were resolved with a change to units definitions (**breaking
change**). It affects only units that specify both Unicode and ASCII symbols. The new design
requires the Unicode symbol to be provided as a UTF-8 literal:
=== "Now"
```cpp
inline constexpr struct ohm : named_unit<{u8"Ω", "ohm"}, volt / ampere> {} ohm;
```
=== "Before"
```cpp
inline constexpr struct ohm : named_unit<{"Ω", "ohm"}, volt / ampere> {} ohm;
```
## Even better error messages ## Even better error messages
This release made a few small refactorings that without changing the user-facing API allowed us This release made a few small refactorings that without changing the user-facing API allowed us