Welcome to mp-units!

mp-units is a compile-time enabled feature-rich Modern C++ modular/header-only library that provides compile-time dimensional analysis and unit/quantity manipulation. Its key strengths include safety, performance, and developer experience.

The library source code is hosted on GitHub with a permissive MIT license.

!!! important "Important: Help needed!"

The **mp-units** library might be the subject of ISO standardization for C++29. More on this can
be found in the following ISO C++ proposals:

- [P1935: A C++ Approach to Physical Units](https://wg21.link/p1935),
- [P2980: A motivation, scope, and plan for a physical quantities and units library](https://wg21.link/p2980),
- [P2981: Improving our safety with a physical quantities and units library](https://wg21.link/p2981),
- [P2982: `std::quantity` as a numeric type](https://wg21.link/p2982).

We are actively looking for parties interested in field-trialing the library.

??? info "Supported compilers"

This library tries to provide the best user experience possible with the C++ language.
To achieve that, it extensively uses C++20 features and the
[explicit object parameter](https://en.cppreference.com/w/cpp/language/member_functions#Explicit_object_parameter)
from C++23.

Even though the library benefits from C++23 (if available), C++20 is enough to compile and
use all of the library's functionality. C++23 features are hidden behind
a [preprocessor macro](users_guide/framework_basics/systems_of_quantities.md#defining-quantities)
providing a backward-compatible way to use it.

As of today, the library compiles fine on the following compilers (or newer):

- gcc-11
    - please note that we observed some ICEs on gcc-11
    - no problems with gcc-12.2+
- clang-16
- apple-clang-15

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Welcome to mp-units!

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