[−][src]Crate pl_lens

Macros

compose_lens	Provides a shorthand for composing a series of lenses.
lens	This is a macro-based shorthand that allows us to write:

ComposedLens	Composes two `Lens`es.
LensPath	Describes a lens relative to a source data structure.
LensPathElement	An element in a `LensPath`.

Lens	A lens offers a purely functional means to access and/or modify a field that is nested in an immutable data structure.
RefLens	A lens that allows the target to be accessed and mutated by reference.
ValueLens	A lens that allows the target to be accessed only by cloning or copying the target value.

compose	Composes a `Lens<A, B>` with another `Lens<B, C>` to produce a new `Lens<A, C>`.
modify	Modifies the target of the lens by applying a function to the current value. This consumes the source. (This lives outside the `Lens` trait to allow lenses to be object-safe but still allow for static dispatch on the given closure.)

Handles the #derive(Lenses) applied to a struct by generating a Lens implementation for each field in the struct.