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Document UpState

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This commit is contained in:
Temirkhan Myrzamadi 2020-07-26 04:43:08 +06:00
parent e9b797fe61
commit b255dfaf61
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src/up_state.rs
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@ -1,6 +1,14 @@
#[cfg(feature = "frunk")] #[cfg(feature = "frunk")]
use frunk::{from_generic, generic::Generic, hlist::HAppender, into_generic}; use frunk::{from_generic, generic::Generic, hlist::HAppender, into_generic};
/// Constructs a structure from another structure and a field.
///
/// Let `X` be a structure of `field1, ..., fieldN`, `Y` be `field1, ...,
/// fieldN, fieldN+1`. Both `X` and `Y` implement [`Generic`]. Then `Y::up(x,
/// fieldN+1)` constructs `Y` from all the fields of `x: X` plus `Y`'s
/// `fieldN+1`.
///
/// [`Generic`]: https://docs.rs/frunk/latest/frunk/generic/trait.Generic.html
#[cfg(feature = "frunk")] #[cfg(feature = "frunk")]
pub trait UpState: Sized { pub trait UpState: Sized {
fn up<T1, T1Repr, F>(src: T1, field: F) -> Self fn up<T1, T1Repr, F>(src: T1, field: F) -> Self