Crate getters_by_type 

This crate provides GettersByType derive macro for structs, which implements a getter method for each type they contain.

The generated methods start with the prefix get_fields_ and end with a transcription of the type they refer.

Example using GettersByType :

use getters_by_type::GettersByType;
#[derive(GettersByType)]
struct Foo {
    first: i32,
    second: i32,
    third: i32,
}

let object = Foo { first: 6, second: 12, third: 24 };

// Let's sum all the i32 fields with a fold expression:
assert_eq!(object.get_fields_i32().iter().fold(0, |acc, x| **x + acc), 42);

As you notice, the getter methods return an array containing references to all the fields of the same type. In that example, the return type of the method get_fields_i32 would be [&i32; 3].

This crate also provides a mut version GettersMutByType which also adds a mut version for those methods.

In this case, the generated methods start with the prefix get_mut_fields_ instead.

Example using GettersMutByType :

use getters_by_type::GettersMutByType;

#[derive(Default)]
struct Updater {}
impl Updater {
    fn update(&mut self) {/*...*/}
}

#[derive(GettersMutByType, Default)]
struct Foo {
    first: Updater,
    second: Updater,
    /*...*/
    onehundredth: Updater,
}

let mut object = Foo::default();

// Let's update all the Updater fields
for updater in object.get_mut_fields_updater().iter_mut() {
    updater.update();
}

In this example, the return type of the method get_mut_fields_updater would be [&mut Updater; 3]. There is no dynamic memory allocation happening within the getter methods, as they just return a fixed array with references. There isn’t also unsafe code being generated. For more documentation and examples, see each respective documentation section.

Derive Macros

GettersByType

The GettersByType macro automatically generates an impl for the given struct, implementing a getter method for each different type contained within the struct.

GettersMutByType

The GettersMutByType macro automatically generates an impl for the given struct, implementing a getter method for each different type contained within the struct.