SG16 reviewed drafts of P3045R0 during its 2023-11-29 and 2024-01-24 meetings. No polls have been taken yet, but feedback has been provided to the author and we look forward to a new revision.

Based on feedback provided to the author by SG16, I'm adding the needs-revision label. However, I encourage LEWGI and SG6 chairs to schedule initial reviews of this large paper regardless. There is no reason for those groups to wait for SG16 feedback to be addressed.

P3045R0: Quantities and units library

2024-03-19/22 SG6 Minutes

Chair: Lisa Lippincott

Champion: Mateusz Pusz

Summary

SG6 discussion on Tuesday revolved mostly around affine spaces (points vs
vectors) and consequences on the API. On Friday SG6 resumed the discussion on
affine spaces on an updated D3045R1.

Polls

POLL: The syntax number * unit is the right solution for constructing
quantities. Not allowing reordering the operands is correct.

Author Position: SF
Outcome: Consensus

POLL: Not defining any UDLs is the right solution.

No objection to unanimous consent.

Next Steps

• Explore alternatives and alternative names to quantity_from_zero()
  (quantity_from_unit_origin(), quantity_from_relative_origin(),
  quantity_from_absolute_origin(), subtract_abs_origin()...).

• Reconsider how quantity_points (e.g. measured temperatures) could be
  printed without explicitly computing a quantity.

2024-03-20 Tokyo Library Evolution Incubator

P3045R0: Quantities and units library

2024-03-20 Library Evolution Incubator Telecon Minutes

Champion: Mateusz Pusz
Chair: Nevin Liber / Billy Baker
Minute Taker: Luke Valenty

Summary

No polls were taken.

Next Steps

Continue the LEWGI discussion.

P3045R1 Quantities and units library (Mateusz Pusz, Dominik Berner, Johel Ernesto Guerrero Peña, Charles Hogg, Nicolas Holthaus, Roth Michaels, Vincent Reverdy)