mpusz/mp-units
1
0
Fork 1
mirror of https://github.com/mpusz/mp-units.git synced 2025-07-30 02:17:16 +02:00
Code Issues Packages Projects Releases Wiki Activity

docs: 2.2 release annonuncement updated

Browse Source
This commit is contained in:
Mateusz Pusz
2024-06-06 13:45:12 +02:00
parent 68da34a3b5
commit 7319e78088
1 changed files with 14 additions and 4 deletions
Download Patch File Download Diff File Expand all files Collapse all files

18
docs/blog/posts/2.2.0-released.md
View File

@ -260,6 +260,16 @@ named with its corresponding unit and with the `si::zeroth_degree_Celsius`
## Changes to units definitions
There were several known issues when units were deriving from each other
(e.g., [#512](https://github.com/mpusz/mp-units/issues/512) and
[#537](https://github.com/mpusz/mp-units/issues/537)). We could either highly complicate the
framework to allow these which could result in much longer compilation times or disallow inheriting
from units at all. We chose the second option.
With this release all of of the units must be marked as `final`. To enforce this we have changed
the definition of the `Unit<T>` concept, which now requires type `T` to be `final`
(:boom: **breaking change** :boom:).
[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
@ -272,7 +282,7 @@ is why it was renamed to `symbol_text` (:boom: **breaking change** :boom:).
=== "Now"
```cpp
inline constexpr struct ohm : named_unit<symbol_text{u8"Ω", "ohm"}, volt / ampere> {} ohm;
inline constexpr struct ohm final : named_unit<symbol_text{u8"Ω", "ohm"}, volt / ampere> {} ohm;
```
=== "Before"
@ -286,7 +296,7 @@ is why it was renamed to `symbol_text` (:boom: **breaking change** :boom:).
On C++20-compliant compilers it should be enough to type the following in the unit's definition:
```cpp
inline constexpr struct ohm : named_unit<{u8"Ω", "ohm"}, volt / ampere> {} ohm;
inline constexpr struct ohm final : named_unit<{u8"Ω", "ohm"}, volt / ampere> {} ohm;
```
## Improved text output
@ -461,8 +471,8 @@ conversion factor. Here is a comparison of the code with previous and current de
=== "Now"
```cpp
inline constexpr struct yard : named_unit<"yd", mag_ratio<9'144, 10'000> * si::metre> {} yard;
inline constexpr struct foot : named_unit<"ft", mag_ratio<1, 3> * yard> {} foot;
inline constexpr struct yard final : named_unit<"yd", mag_ratio<9'144, 10'000> * si::metre> {} yard;
inline constexpr struct foot final : named_unit<"ft", mag_ratio<1, 3> * yard> {} foot;
```
=== "Before"