Mp-units Alternatives

mp-units reviews and mentions

• Python type hints may not be not for me in practice
  8 projects | news.ycombinator.com | 27 Nov 2024

  I suspect C++ still comes the closest to what you’re asking for today, at least among mainstream programming languages.

  Matrix dimensions are certainly doable, for example, because templates representing mathematical types like matrices and vectors can be parametrised by integers defining their dimension(s) as well as the type of an individual element.

  You can also use template wizardry to write libraries like mp-units¹ or units² that provide explicit representations for numerical values with units. You can even get fancy with user-defined literals so you can write things like 0.5_m and have a suitably-typed value created (though that particular trick does get less useful once you need arbitrary compound units like kg·m·s⁻²).

  Both of those are fairly well-defined problems and the solutions available do provide a good degree of static checking at compile time.

  IMHO, the range question is the trickiest one of your three examples, because in real mathematical code there are so many different things you might want to constrain. You could define a parametrised type representing open or closed ranges of integers between X and Y easily enough, but how far down the rabbit hole do you go? Fractional values with attached precision/error metadata? The 572 specific varieties of matrix that get defined in a linear algebra textbook, and which variety you get back when you compute a product of any two of them?

  ¹ https://mpusz.github.io/mp-units/

  ² http://nholthaus.github.io/units/

• What's the point of std:monostate? You can't do anything with it
  1 project | news.ycombinator.com | 22 Jul 2024

  There is indeed a units library [0] aiming for standardisation in C++29.

  [0] https://github.com/mpusz/mp-units

• Is it just mean, or is C# easier to learn than JavaScript or even PHP?
  2 projects | /r/dotnet | 6 Dec 2023

  It's not the type system you're complaining about, though. It takes a bit of work but you can write types that include units information with no loss of performance.

• I'm a beginner making a library for unit conversion, contributions are welcome
  4 projects | /r/cpp | 21 Apr 2023

  I recommend using this as reference https://github.com/mpusz/units it probably solves the same or similar problem.

• Why is this piece of code compiling with char as c-tor argument?
  2 projects | /r/cpp_questions | 7 Feb 2023

  Yep. And there are some libraries to provide strong-type int, depending on what you need: type_safe or even units.

• C++'s smaller cleaner language
  11 projects | /r/cpp | 31 Dec 2022

  Indeed you cannot. Then again, you couldn't write a library like fmtlib in C in the first place. I mean why do you complain about C++ features which enable you to write libraries you otherwise couldn't? How would you expect to implement equivalent libraries to EVE or mp-units in C alone?

• I got curious about units of measure in programming languages so I recreated xkcd/687.
  1 project | /r/xkcd | 24 May 2022

  How does it compare with https://github.com/mpusz/units ?

• C++ for Mathematicians
  2 projects | /r/cpp | 2 Apr 2022

  I don't have a book to recommend, but I have a fantastic library: https://github.com/mpusz/units

• Cheatsheet for the C++ core guidelines (philosophy)
  4 projects | /r/programming | 29 Mar 2022
• Compile-time C++ library for compile-time dimensional analysis, units/quantities
  1 project | news.ycombinator.com | 20 Mar 2022
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