fmt_ext

A simple interface for extending external types with custom implementations of [Debug] and [Display] traits.

The example below shows how implement custom debug formatting for slices that additionally print their length.

```rust use std::{fmt, marker::PhantomData};

use fmt_ext::{debug::*, DebugExt};

// Create a type that will implement custom debug... struct SliceWithLenDebug(PhantomData);

// Implement custom debug... impl CustomDebug for SliceWithLenDebug where T: fmt::Debug, { type Target = [T];

fn fmt_target(target: &Self::Target, f: &mut fmt::Formatter<'_>) -> fmt::Result {
    write!(f, "Slice {{ len: {}, items: {:?} }}", target.len(), target)
}

}

// Attach custom debug implementation to the target type... impl AttachDebug> for [T] {}

// Look! Now we just call debug method on the target type... fn main() { let numbers = [0, 1, 2, 3]; println!("{:?}", numbers.debug());

let strings = vec!["I", "am", "a", "custom", "debug"];
println!("{:?}", strings.debug());

} ```

All examples are in [this directory].

Support of #![no_std]

fmt_ext supports #![no_std] mode by default.

License

fmt_ext is distributed under the terms of both the MIT license.