557d2a76fe
Summary: Pull Request resolved: https://github.com/facebook/yoga/pull/1382 X-link: https://github.com/facebook/react-native/pull/39437 Have been running into places where C++ 20 makes life easier for use like `std::bit_cast` (that one is easy to polyfill), in-class member initializer support for bitfields, designated initializers, defaulted comparison operator, concepts instead of SFINAE, and probably more. Our other infra is in the process of making this jump, or already has. This tests it out everywhere, across the various reference builds, to see if we have any issues. This is a bit more aggressive than I had previously communicated, but n - 1 is going to be a better long term place than n - 2. If we wanted to use `std::bit_cast` we would need one of: 1. GCC 11+ (~2.5 years old) 1. Clang 14 (~2.5 years old) 1. VS 16.11 (~2 years old) For mobile this means: 1. NDK 26 (still in Beta 😭) 1. XCode 14.3.0 (~6 months old) https://en.cppreference.com/w/cpp/compiler_support/20 That isn't quite doable yet, but we can start taking advantage of language features in the meantime. More of these will be supported in older toolchains. Anyone needing support for older C++ versions can lag behind on more recent changes. E.g. Yoga 2.0 supports C++ 14. bypass-github-export-checks Changelog: [Internal] Reviewed By: cortinico Differential Revision: D49261607 fbshipit-source-id: ceb06eac20dfe93352d7b796d6847a7314069cf3
37 lines
1.9 KiB
Markdown
37 lines
1.9 KiB
Markdown
# Yoga [](https://opensource.fb.com/support-ukraine) [](http://cocoapods.org/pods/Yoga) [](https://www.npmjs.com/package/yoga-layout) [](https://search.maven.org/artifact/com.facebook.yoga/yoga)
|
|
|
|
Yoga is an embeddable and performant flexbox layout engine with bindings for multiple languages.
|
|
|
|
|
|
## Building
|
|
Yoga's main implementation targets C++ 20 with accompanying build logic in CMake. A wrapper is provided to build the main library and run unit tests.
|
|
|
|
```sh
|
|
./unit_tests <Debug|Release>
|
|
```
|
|
|
|
While not required, this script will use [ninja](https://ninja-build.org/) if it is installed for faster builds.
|
|
|
|
Yoga is additionally part of the [vcpkg](https://github.com/Microsoft/vcpkg/) collection of ports maintained by Microsoft and community contributors. If the version is out of date, please [create an issue or pull request](https://github.com/Microsoft/vcpkg) on the vcpkg repository.
|
|
|
|
|
|
|
|
## Adding Tests
|
|
|
|
Many of Yoga's tests are automatically generated, using HTML fixtures describing node structure. These are rendered in Chrome to generate an expected layout result for the tree. New fixtures can be added to `gentest/fixtures`.
|
|
|
|
```html
|
|
<div id="my_test" style="width: 100px; height: 100px; align-items: center;">
|
|
<div style="width: 50px; height: 50px;"></div>
|
|
</div>
|
|
```
|
|
|
|
To generate new tests from added fixtures:
|
|
1. Run `bundle install` in the `gentest` directory to install dependencies of the test generator.
|
|
2. Run `ruby gentest.rb` in the `gentest` directory.
|
|
|
|
|
|
## Debugging
|
|
|
|
Yoga provides a VSCode "launch.json" configuration which allows debugging unit tests. Simply add your breakpoints, and run "Debug C++ Unit tests (lldb)" (or "Debug C++ Unit tests (vsdbg)" on Windows).
|