bevy_reflect_derive/
struct_utility.rs

1use crate::ReflectStruct;
2
3/// A helper struct for creating remote-aware field accessors.
4///
5/// These are "remote-aware" because when a field is a remote field, it uses a [`transmute`] internally
6/// to access the field.
7///
8/// [`transmute`]: std::mem::transmute
9pub(crate) struct FieldAccessors {
10    /// The referenced field accessors, such as `&self.foo`.
11    pub fields_ref: Vec<proc_macro2::TokenStream>,
12    /// The mutably referenced field accessors, such as `&mut self.foo`.
13    pub fields_mut: Vec<proc_macro2::TokenStream>,
14    /// The ordered set of field indices (basically just the range of [0, `field_count`).
15    pub field_indices: Vec<usize>,
16    /// The number of fields in the reflected struct.
17    pub field_count: usize,
18}
19
20impl FieldAccessors {
21    pub fn new(reflect_struct: &ReflectStruct) -> Self {
22        let (fields_ref, fields_mut): (Vec<_>, Vec<_>) = reflect_struct
23            .active_fields()
24            .map(|field| {
25                (
26                    reflect_struct.access_for_field(field, false),
27                    reflect_struct.access_for_field(field, true),
28                )
29            })
30            .unzip();
31
32        let field_count = fields_ref.len();
33        let field_indices = (0..field_count).collect();
34
35        Self {
36            fields_ref,
37            fields_mut,
38            field_indices,
39            field_count,
40        }
41    }
42}
bevy_reflect_derive/struct_utility.rs

bevy_reflect_derive/
struct_utility.rs
