physical-units topic
mp-units
The quantities and units library for C++
units
A run-time C++ library for working with units of measurement and conversions between them and with string representations of units and measurements
SI
A header only C++ library that provides type safety and user defined literals for physical units
tensor
linear algebra for tensors with symbolic and numeric scalars
au
A C++14-compatible physical units library with no dependencies and a single-file delivery option. Emphasis on safety, accessibility, performance, and developer experience.
unlib
a light-weight, header-only, dependency-free, C++14 library for ISO units