forked from mpusz/mp-units
99 lines
4.0 KiB
Markdown
99 lines
4.0 KiB
Markdown
[](./LICENSE.md)
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[](https://travis-ci.com/mpusz/units)
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[](https://bintray.com/mpusz/conan-mpusz/mp-units%3Ampusz/0.3.1%3Astable/link)
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[](https://bintray.com/mpusz/conan-mpusz/mp-units%3Ampusz/_latestVersion)
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# `mp-units` - A Units Library for C++
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## Summary
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`Units` is a compile-time enabled Modern C++ library that provides compile-time dimensional
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analysis and unit/quantity manipulation. The basic idea and design heavily bases on
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`std::chrono::duration` and extends it to work properly with many dimensions.
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Here is a small example of possible operations:
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```cpp
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// simple numeric operations
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static_assert(10_km / 2 == 5_km);
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// unit conversions
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static_assert(1_h == 3600_s);
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static_assert(1_km + 1_m == 1001_m);
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// dimension conversions
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static_assert(1_km / 1_s == 1000_mps);
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static_assert(2_kmph * 2_h == 4_km);
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static_assert(2_km / 2_kmph == 1_h);
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static_assert(1000 / 1_s == 1_kHz);
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static_assert(10_km / 5_km == 2);
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```
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## Repository structure
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That repository contains the following independent `cmake`-based projects:
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- `./src` - header-only project for `units`
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- `.` - project used for development needs that wraps `./src` project together with
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usage examples and unit tests
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- `./test_package` - library installation and Conan package verification
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Please note that the projects depend on `cmake` git submodule in the `./cmake/common`
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subdirectory.
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## Building, testing, and installation
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For a detailed information on project compilation, testing and reuse please refer to
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[doc/INSTALL.md](doc/INSTALL.md).
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NOTE: This library as of now compiles correctly only with gcc-9.1 and newer.
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## Library design
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`mp-units` library design rationale and documentation can be found in
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[doc/DESIGN.md](doc/DESIGN.md)
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## Release notes
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- 0.4.0 ???
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- Support for derived dimensions in `exp` added
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- Added `pow()` and `sqrt()` operations on quantities
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- `units` removed from a `std::experimental` namespace
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- Downcasting facility refactored so the user does not have to write the boilerplate code anymore
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- From now on base dimensions should inherit from `base_dimension` class template
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- Added unit symbols definitions to `base_dimension` and `derived_unit`
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- 0.3.1 Sep 18, 2019
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- cmcstl2 dependency changed to range-v3 0.9.1
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- 0.3.0 Sep 16, 2019 (CppCon 2019 design)
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- The design as described on CppCon 2019 talk (<https://youtu.be/0YW6yxkdhlU>)
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- Applied the feedback from the Cologne evening session
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- `upcasting_traits` renamed to `downcasting_traits`
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- `Dimension` template parameter removed from quantity
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- `units` moved to a `std::experimental` namespace
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- Leading underscore prefix removed from UDLs
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- Added a few more derived dimensions
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- `meter` renamed to `metre`
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- Missing `operator*` added
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- Predefined dimensions moved to a dedicated directory
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- `dimension_` prefix removed from names of derived dimensions
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- cmcstl2 library updated to 2019.09.19
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- `base_dimension` is a value provided as `const&` to the `exp` type
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- integrated with Compiler Explorer
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- gsl-lite dependency removed
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- Fractional dimension exponents support added
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- `QuantityOf` concept introduced
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- `quantity_cast<U, Rep>()` support added
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- 0.2.0 July 18, 2019 (C++Now 2019 design)
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- The design as described on C++Now 2019 talk (<https://youtu.be/wKchCktZPHU>)
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- Added C++20 features supported by gcc-9.1 (`std::remove_cvref_t`, down with typename, `std::type_identity`)
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- Compile-time performance optimizations (`type_list`, `common_ratio`, `ratio`, `conditional_t`)
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- 0.1.0 May 18, 2019
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- Initial library release
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- Begin semantic versioning
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- The last version to work with gcc-8
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