Crate field_path 

Field Path

field_path provides a lightweight and type-safe abstraction for referencing and accessing nested fields within structs.

The crate is designed to make it easier to generically inspect or mutate fields without relying on heavy reflection systems or unsafe code. It does this through a combination of field identifiers and accessors that preserve type information.

Core Concepts

• Field: Represents a unique, type-safe identifier for a field path within a struct.
• Accessor: A generic wrapper providing read and write access to a field.
• FieldAccessorRegistry: A mapping between fields and their accessors for lookup and dynamic use.

Together, these components allow building flexible systems that can access or manipulate struct data without tightly coupling to specific types.

Example

use field_path::accessor::{FieldAccessorRegistry, accessor};
use field_path::field::field;

#[derive(Default)]
struct Vec2<T> {
    pub x: T,
    pub y: T,
}

let mut registry = FieldAccessorRegistry::default();
let field = field!(<Vec2<f32>>::x);

// Register accessors.
registry.register_typed(field, accessor!(<Vec2<f32>>::x));

// Access field generically.
let mut v = Vec2::default();
let accessor =
    registry.get::<Vec2<f32>, f32>(&field.untyped()).unwrap();

*accessor.get_mut(&mut v) = 42.0;
assert_eq!(accessor.get_ref(&v), &42.0);

Modules

accessor

Accessor system for mapping source structures to target fields.

field

Provides abstractions for working with typed fields in a type-erased, yet type-safe manner.

Macros

accessor

Creates an Accessor that ensures the fields being accessed are correct for both immutable and mutable reference.

field

Creates a Field with path and type safety.

stringify_field

Stringify a field path into its canonical string form.