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---
date: 2023-11-12
authors:
- mpusz
categories:
- WG21
---

# Report from the Kona 2023 ISO C++ Committee meeting

**Several groups in the ISO C++ Committee reviewed the [P1935: A C++ Approach to Physical Units](https://wg21.link/p1935)
proposal in Belfast 2019 and Prague 2020. All those groups expressed interest in the potential
standardization of such a library and encouraged further work. The authors also got valuable
initial feedback that highly influenced the design of the V2 version of the mp-units library.**

In the following years, we scoped on getting more feedback from the production and design and
developed version 2 of the **mp-units** library that resolves many issues raised by the users and
Committee members. The features and interfaces of this version are close to being the best we can
get with the current version of the C++ language standard.

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For the last ISO C++ Committee meeting, we provided three new proposals related to the
standardization of the quantities and units library:

- [P2980: A motivation, scope, and plan for a physical quantities and units library](https://wg21.link/p2980R1),
- [P2981: Improving our safety with a physical quantities and units library](https://wg21.link/p2981R1),
- [P2982: `std::quantity` as a numeric type](https://wg21.link/p2982R1).

Those were reviewed and briefly discussed in several groups: Numerics (SG6), Safety & Security
(SG23), and Library Evolution Working Group (LEWG). Most of the feedback was positive, and
the Committee is interested in spending more time on such proposals.

!!! question "LEWG POLL: Given that our time is limited, more time should be promised for a quantities and units library"

| SF | F | N | A | SA |
|----|----|---|---|----|
| 10 | 13 | 4 | 0 | 0 |

Attendance: 22 + 6

Number of Authors: 4

Authors’ position: 4x SF

Outcome: Strong consensus in favor

Additionally, some concerns were raised about the large scope of the proposal. We were encouraged
to come back with more details and design rationale in a unified paper. This is what we are working
on now for the next Committee meeting that will happen in mid-March 2024 in Tokyo.

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