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sharkdp/salsa: A generic framework for on-demand, incrementalized computation. Inspired by adapton, glimmer, and rustc's query system.

A generic framework for on-demand, incrementalized computation.

Very much a WORK IN PROGRESS at this point. Ready for experimental use but expect frequent breaking changes.

This system is heavily inspired by adapton, glimmer, and rustc's query system. So credit goes to Eduard-Mihai Burtescu, Matthew Hammer, Yehuda Katz, and Michael Woerister.

The key idea of salsa is that you define your program as a set of queries. Every query is used like function K -> V that maps from some key of type K to a value of type V. Queries come in two basic varieties:

• Inputs: the base inputs to your system. You can change these whenever you like.
• Functions: pure functions (no side effects) that transform your inputs into other values. The results of queries are memoized to avoid recomputing them a lot. When you make changes to the inputs, we'll figure out (fairly intelligently) when we can re-use these memoized values and when we have to recompute them.

To learn more about Salsa, try one of the following:

• read the heavily commented examples;
• check out the Salsa book;
  • 中文版
• watch one of our videos.

The bulk of the discussion happens in the issues and pull requests, but we have a zulip chat as well.

To create a release and publish to crates.io, follow the steps:

1. Update the version field in Cargo.toml.
2. Create a Git tag. The tag name must follow the format like "v*..".
3. Push. GitHub Actions will publish the crate to crates.io automatically.

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