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Ensure value_cast<QP> uses the minimum number of operataions needed #598

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This PR is supposed to continue from the discussion here, where value_cast<QP> was introduced.

Basically, value_cast<QP> does three steps:

  1. Convert the representation/unit of the input quantity_point to an intermediate representation, not touching the origin
  2. Change the origin by adding a suitable offset
  3. Convert the representation/unit of the intermediate quantity_point to the final representation.

However, in the current implementation, the second step (change of origin) may in fact introduce more representation conversions internally: to a common representation between the offset and the value. However, here, that is not necessary, because the representation of the value is already chosen suitably.

@mpusz mpusz added this to the v2.3.0 milestone Jul 20, 2024
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mpusz commented Jul 29, 2024

@burnpanck, I fixed all the CI issues today. If you could rebase to master, we would see this change's real CI status.

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mpusz commented Sep 6, 2024

@burnpanck, do you still plan to work on your PRs?

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mpusz commented Sep 13, 2024

Hi @burnpanck! Do you plan to work on those in the near future. I plan to release mp-units 2.3 soon.

@burnpanck burnpanck force-pushed the feature/efficient-value-cast-QP branch from 341b4eb to 61198fe Compare September 14, 2024 16:16
@mpusz mpusz modified the milestones: v2.3.0, v2.4.0 Sep 27, 2024
@mpusz mpusz modified the milestones: v2.4.0, v2.5.0 Oct 30, 2024
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