[−][src]Trait structural::field::rev_get_field::RevGetFieldMut

pub trait RevGetFieldMut<'a, This>: RevGetFieldMutImpl<'a, This, Err = InfallibleAccess> { }

A trait alias for an infallible RevGetFieldMutImpl, generally used to access fields in structs(not in a nested enum inside the struct).

This is the type we are accessing,and Self is a field path.

Example

This example shows how to access a nested struct field by mutable reference.

use structural::field::RevGetFieldMut;
use structural::for_examples::{StructFoo, StructBar, Struct3};
use structural::{StructuralExt,FP,fp};

let mut struct_=Struct3{
    foo: Some(0),
    bar: "hi",
    baz: StructBar{
        bar: StructFoo{
            foo:101,
        },
    },
};

assert_eq!( get_nested(&mut struct_), &mut 101 );

fn get_nested<'a,T>(this:&'a mut T)->&'a mut i32
where
    FP!(baz.bar.foo): RevGetFieldMut<'a,T,Ty=i32>
{
    this.field_mut(fp!(baz.bar.foo))
}

Implementors

impl<'a, Path, This> RevGetFieldMut<'a, This> for Path where
    Path: RevGetFieldMutImpl<'a, This, Err = InfallibleAccess>, [src]

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