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core: add as_ref

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🪞👃🪞 2025-09-07 23:27:35 +03:00
parent d6dcf137a8
commit 18b6803912
1 changed files with 13 additions and 0 deletions
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13
core/src/lib.rs
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@ -1,13 +1,18 @@
mod core_macros; mod core_macros;
pub(crate) use std::error::Error; pub(crate) use std::error::Error;
/// Standard result type. /// Standard result type.
pub type Usually<T> = Result<T, Box<dyn Error>>; pub type Usually<T> = Result<T, Box<dyn Error>>;
/// Standard optional result type. /// Standard optional result type.
pub type Perhaps<T> = Result<Option<T>, Box<dyn Error>>; pub type Perhaps<T> = Result<Option<T>, Box<dyn Error>>;
/// Type-dispatched `get` and `get_mut`. /// Type-dispatched `get` and `get_mut`.
pub trait Has<T>: Send + Sync { fn get (&self) -> &T; fn get_mut (&mut self) -> &mut T; } pub trait Has<T>: Send + Sync { fn get (&self) -> &T; fn get_mut (&mut self) -> &mut T; }
/// Type-dispatched `get` and `get_mut` that return an [Option]-wrapped result. /// Type-dispatched `get` and `get_mut` that return an [Option]-wrapped result.
pub trait MaybeHas<T>: Send + Sync { fn get (&self) -> Option<&T>; fn get_mut (&mut self) -> Option<&mut T>; } pub trait MaybeHas<T>: Send + Sync { fn get (&self) -> Option<&T>; fn get_mut (&mut self) -> Option<&mut T>; }
/// May compute a `RetVal` from `Args`. /// May compute a `RetVal` from `Args`.
pub trait Eval<Args, RetVal> { pub trait Eval<Args, RetVal> {
/// A custom operation on [Args] that may return [Result::Err] or [Option::None]. /// A custom operation on [Args] that may return [Result::Err] or [Option::None].
@ -22,3 +27,11 @@ pub trait Eval<Args, RetVal> {
} }
} }
} }
#[macro_export] macro_rules! as_ref {
($T:ty: |$self:ident : $S:ty| $x:expr) => {
impl AsRef<$T> for $S {
fn as_ref (&$self) -> &$T { &$x }
}
};
}