easy-ext

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An attribute macro for easily writing extension trait pattern.

Usage

Add this to your Cargo.toml:

toml [dependencies] easy-ext = "0.2"

The current easy-ext requires Rust 1.31 or later.

Examples

```rust use easy_ext::ext;

[ext(ResultExt)]

impl Result { pub fn errinto(self) -> Result where E: Into, { self.maperr(Into::into) } } ```

Code like this will be generated:

```rust pub trait ResultExt { fn err_into(self) -> Result where E: Into; }

impl ResultExt for Result { fn errinto(self) -> Result where E: Into, { self.maperr(Into::into) } } ```

You can elide the trait name. Note that in this case, #[ext] assigns a random name, so you cannot import/export the generated trait.

```rust use easy_ext::ext;

[ext]

impl Result { fn errinto(self) -> Result where E: Into, { self.maperr(Into::into) } } ```

Visibility

The visibility of the generated extension trait inherits the visibility of the item in the original impl.

For example, if the method is pub then the trait will also be pub:

```rust use easy_ext::ext;

[ext(ResultExt)] // generate pub trait ResultExt

impl Result { pub fn errinto(self) -> Result where E: Into, { self.maperr(Into::into) } } ```

See documentation for more details.

License

Licensed under either of

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.