Trait Validate 

pub trait Validate:
    Send
    + Sync
    + 'static {
    // Required method
    fn check(&self, value: &str) -> Result<(), String>;
}

Anything that can decide whether an input string is acceptable.

Implement this for any external validation library to bridge it into the prompt’s .rule(...) chain.

Required Methods

fn check(&self, value: &str) -> Result<(), String>

Return Ok(()) to accept the value, Err(msg) to reject and show msg as the user-facing error.

Dyn Compatibility

This trait is dyn compatible.

In older versions of Rust, dyn compatibility was called "object safety".

Implementors

impl Validate for Validator

impl<F> Validate for F

where F: Fn(&str) -> Result<(), String> + Send + Sync + 'static,