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Select	Paper	Title	Authors	Audience	Mailing Date
	P3045R8	Quantities and units library	Mateusz Pusz M. Pusz , Dominik Berner D. Berner , Johel Ernesto Guerrero Peña J. Peña , Charles Hogg C. Hogg , Nicolas Holthaus N. Holthaus , Roth Michaels R. Michaels , Vincent Reverdy V. Reverdy	LEWG SG6 SG16 SG20	2026-05
Mailing Date 2026-05 Pre-Brno Author(s) Mateusz Pusz, Dominik Berner, Johel Ernesto Guerrero Peña, Charles Hogg, Nicolas Holthaus, Roth Michaels, Vincent Reverdy Target Audience LEWG SG6 SG16 SG20 Revisions R9 R7 R6 Tracking issue View on GitHub Abstract Several groups in the ISO C++ Committee reviewed the “P1935: A C++ Approach to Physical Units” [[P1935R2]](https://wg21.link/p1935r2) 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 [[
	P4185R0	Completing the Mathematical Model for C++ Quantities and Units	Mateusz Pusz M. Pusz	SG6	2026-05
Mailing Date 2026-05 Pre-Brno Author(s) Mateusz Pusz Target Audience SG6 Revisions R1 Tracking issue View on GitHub Abstract [[P3045R7]](https://wg21.link/p3045r7) proposes a C++ quantities and units framework built on two core abstractions: `quantity` (displacement vectors) and `quantity_point` (points in an affine space). Real-world experience with the [[mp-units]](https://mpusz.github.io/mp-units) reference implementation, together with feedback from SG6, BSI, ANSI, and the broader C++ community, shows that this
	P4213R0	Minimal SI: Defining the International System of Units for the C++ Standard Library	Mateusz Pusz M. Pusz	LEWG	2026-05
Mailing Date 2026-05 Pre-Brno Author(s) Mateusz Pusz Target Audience LEWG Tracking issue View on GitHub Abstract [[P3045R8]](https://wg21.link/p3045r8) supplies the type system. It does not supply the SI. A user who includes the framework gets `quantity` , `unit` , `quantity_spec` , `prefix` — but no `metre` , no `kilogram` , no `second` . The framework is deliberately content-agnostic: it supports arbitrary systems of quantities and units. Shipping the framework without SI content would be like shipping `<a

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