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docs](https://docs.rs/salsa/badge.svg)](https://docs.rs/salsa)\n[![Crates.io](https://img.shields.io/crates/v/salsa.svg)](https://crates.io/crates/salsa)\n\n*A generic framework for on-demand, incrementalized computation.*\n\n\u003cimg alt=\"Salsa Logo\" src=\"https://raw.githubusercontent.com/salsa-rs/logo/main/FerrisSalsa4-01.svg\" width=\"200\" /\u003e\n\n## Obligatory warning\n\nVery much a WORK IN PROGRESS at this point.\n\n## Credits\n\nThis system is heavily inspired by [adapton](http://adapton.org/), [glimmer](https://github.com/glimmerjs/glimmer-vm), and rustc's query\nsystem. So credit goes to Eduard-Mihai Burtescu, Matthew Hammer,\nYehuda Katz, and Michael Woerister.\n\n## Key idea\n\nThe key idea of `salsa` is that you define your program as a set of\n**queries**. Every query is used like function `K -\u003e V` that maps from\nsome key of type `K` to a value of type `V`. Queries come in two basic\nvarieties:\n\n- **Inputs**: the base inputs to your system. You can change these\n  whenever you like.\n- **Functions**: pure functions (no side effects) that transform your\n  inputs into other values. The results of queries are memoized to\n  avoid recomputing them a lot. 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