Trait Guard 

pub trait Guard {
    // Required method
    fn check<'life0, 'life1, 'life2, 'async_trait>(
        &'life0 self,
        ctx: &'life1 Context<'life2>,
    ) -> Pin<Box<dyn Future<Output = Result<()>> + Send + 'async_trait>>
       where Self: 'async_trait,
             'life0: 'async_trait,
             'life1: 'async_trait,
             'life2: 'async_trait;
}

Field guard

Guard is a pre-condition for a field that is resolved if Ok(()) is returned, otherwise an error is returned.

Required Methods

fn check<'life0, 'life1, 'life2, 'async_trait>( &'life0 self, ctx: &'life1 Context<'life2>, ) -> Pin<Box<dyn Future<Output = Result<()>> + Send + 'async_trait>>

where Self: 'async_trait, 'life0: 'async_trait, 'life1: 'async_trait, 'life2: 'async_trait,

Available on crate feature boxed-trait only.

Check whether the guard will allow access to the field.

Dyn Compatibility

This trait is dyn compatible.

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

Implementors

impl<T> Guard for T

where T: Fn(&Context<'_>) -> Result<()> + Send + Sync + 'static,