A motivation and plan for a physical quantities and units library

[mpusz]

• safety

• vocabulary types

• embedded devices and mission/life-critical projects often can't use external OSS

• https://www.open-std.org/jtc1/sc22/wg21/docs/papers/2020/p1935r2.html#motivation

• standardizing existing practice and more

• strong types

• composability

• orthogonality of quantities and units

[mpusz]

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