Trait IoResultExt

pub trait IoResultExt<T>: Sealed + Sized {
    // Required methods
    fn optional(self) -> Result<Option<T>>;
    fn can_exist(self) -> Self
       where T: Default;
}

A collection of helper methods for std::io::Result.

Required Methods

fn optional(self) -> Result<Option<T>>

Map potentially not found entities to an Option.

if let Some(config) = File::open("config.json").optional()? {
    // do something...
}

fn can_exist(self) -> Self

where T: Default,

Mask ErrorKind::AlreadyExists errors.

fs::create_dir("cache").can_exist()?;
// And then on a later run...
fs::create_dir("cache").can_exist()?;

Dyn Compatibility

This trait is not dyn compatible.

In older versions of Rust, dyn compatibility was called "object safety", so this trait is not object safe.

Implementations on Foreign Types

impl<T> IoResultExt<T> for Result<T>

fn optional(self) -> Result<Option<T>>

fn can_exist(self) -> Self

where T: Default,

Implementors