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diff --git a/rust/rustlings/exercises/16_lifetimes/README.md b/rust/rustlings/exercises/16_lifetimes/README.md new file mode 100644 index 0000000..91373f7 --- /dev/null +++ b/rust/rustlings/exercises/16_lifetimes/README.md @@ -0,0 +1,22 @@ +# Lifetimes + +Lifetimes tell the compiler how to check whether references live long +enough to be valid in any given situation. For example lifetimes say +"make sure parameter 'a' lives as long as parameter 'b' so that the return +value is valid". + +They are only necessary on borrows, i.e. references, +since copied parameters or moves are owned in their scope and cannot +be referenced outside. Lifetimes mean that calling code of e.g. functions +can be checked to make sure their arguments are valid. Lifetimes are +restrictive of their callers. + +If you'd like to learn more about lifetime annotations, the +[lifetimekata](https://tfpk.github.io/lifetimekata/) project +has a similar style of exercises to Rustlings, but is all about +learning to write lifetime annotations. + +## Further information + +- [Lifetimes (in Rust By Example)](https://doc.rust-lang.org/stable/rust-by-example/scope/lifetime.html) +- [Validating References with Lifetimes](https://doc.rust-lang.org/book/ch10-03-lifetime-syntax.html) |