Contextual

A small crate to deal with data in context.

```rust use contextual::{WithContext, AsRefWithContext, DisplayWithContext}; use std::fmt;

/// Index of an element in some array. pub struct Index(usize);

impl for Index { fn asrefwith<'a>(&'a self, context: &'a C) -> &'a T { &context.as_ref()[self.0] } }

impl<'a, C: AsRef<[&'a str]>> DisplayWithContext for Index { fn fmtwith(&self, context: &C, f: &mut fmt::Formatter) -> fmt::Result { use fmt::Display; context.asref()[self.0].fmt(f) } }

let i = Index(1); let context = ["a", "b", "c"];

print!("index: {}", i.with(&context)); asserteq!(*i.with(&context).asref(), "b") ```

License

Licensed under either of

• Apache License, Version 2.0 (LICENSE-APACHE or http://www.apache.org/licenses/LICENSE-2.0)
• MIT license (LICENSE-MIT or http://opensource.org/licenses/MIT)

at your option.

Contribution

Unless you explicitly state otherwise, any contribution intentionally submitted for inclusion in the work by you, as defined in the Apache-2.0 license, shall be dual licensed as above, without any additional terms or conditions.