2023-12-11 21:26:58 +01:00
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---
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date: 2023-11-12
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authors:
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- mpusz
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categories:
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- WG21
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---
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# Report from the Kona 2023 ISO C++ Committee meeting
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**Several groups in the ISO C++ Committee reviewed the [P1935: A C++ Approach to Physical Units](https://wg21.link/p1935)
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proposal in Belfast 2019 and Prague 2020. All those groups expressed interest in the potential
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standardization of such a library and encouraged further work. The authors also got valuable
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initial feedback that highly influenced the design of the V2 version of the mp-units library.**
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2023-12-17 17:41:42 +01:00
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In the following years, we scoped on getting more feedback from the production and design. This
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resulted in version 2 of the **mp-units** library that resolved many issues the users and Committee
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members raised. The features and interfaces of this version are close to being the best we can get
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with the current version of the C++ language standard.
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2023-12-11 21:26:58 +01:00
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<!-- more -->
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2023-12-17 17:41:42 +01:00
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We submitted three new proposals related to the standardization of the quantities and units library
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for the last ISO C++ Committee meeting:
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2023-12-11 21:26:58 +01:00
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- [P2980: A motivation, scope, and plan for a physical quantities and units library](https://wg21.link/p2980R1),
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- [P2981: Improving our safety with a physical quantities and units library](https://wg21.link/p2981R1),
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- [P2982: `std::quantity` as a numeric type](https://wg21.link/p2982R1).
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Those were reviewed and briefly discussed in several groups: Numerics (SG6), Safety & Security
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(SG23), and Library Evolution Working Group (LEWG). Most of the feedback was positive, and
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the Committee is interested in spending more time on such proposals.
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2023-12-17 17:41:42 +01:00
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The following poll was taken by the LEWG:
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2023-12-11 21:26:58 +01:00
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!!! question "LEWG POLL: Given that our time is limited, more time should be promised for a quantities and units library"
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2023-12-17 17:41:42 +01:00
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| Strongly in Favor | In favor | Neutral | Against | Strongly Against |
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|-------------------|----------|---------|---------|------------------|
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| 10 | 13 | 4 | 0 | 0 |
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2023-12-11 21:26:58 +01:00
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Attendance: 22 + 6
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Number of Authors: 4
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Authors’ position: 4x SF
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Outcome: Strong consensus in favor
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Additionally, some concerns were raised about the large scope of the proposal. We were encouraged
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to return with more details and design rationale in a unified paper. This is what we are working
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on now for the next Committee meeting that will happen in mid-March 2024 in Tokyo.
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