step

step is a crate that provides the trait Step, which allows for unit steps and arbitrary steps on numeric types.

Documentation can be found on [docs.rs].

Using step

Add the crate to the dependencies section of Cargo.toml:

toml [dependencies] step = { git = "https://github.com/ryanq/step" }

Then import the crate and type in your source:

```rust extern crate step;

use step::Step; ```

Then you can use the functions for incrementing and decrementing numbers or implement it on your own types:

```rust let number = 42;

asserteq!(number.next(), 43); asserteq!(number.nextby(&3), 45); asserteq!(number.prev(), 41); asserteq!(number.prevby(&3), 39); ```

```rust struct Foo { bar: i32, }

impl Step for Foo { fn next(&self) -> Self { Foo { bar: self.bar + 1 } } fn nextby(&self, by: &Self) -> Self { Foo { bar: self.bar + *by } } fn prev(&self) -> Self { Foo { bar: self.bar - 1 } } fn prevby(&self, by: &Self) -> Self { Foo { bar: self.bar - *by } } } ```