educe/trait_handlers/clone/
clone_union.rs

1use proc_macro2::TokenStream;
2use quote::quote;
3use syn::{Data, DeriveInput, Meta};
4
5use super::{
6    super::TraitHandler,
7    models::{FieldAttributeBuilder, TypeAttributeBuilder},
8};
9use crate::Trait;
10
11pub struct CloneUnionHandler;
12
13impl TraitHandler for CloneUnionHandler {
14    fn trait_meta_handler(
15        ast: &DeriveInput,
16        tokens: &mut TokenStream,
17        traits: &[Trait],
18        meta: &Meta,
19    ) {
20        let _ = TypeAttributeBuilder {
21            enable_flag: true, enable_bound: false
22        }
23        .from_clone_meta(meta);
24
25        if let Data::Union(data) = &ast.data {
26            for field in data.fields.named.iter() {
27                let _ = FieldAttributeBuilder {
28                    enable_impl: false
29                }
30                .from_attributes(&field.attrs, traits);
31            }
32        }
33
34        let ident = &ast.ident;
35
36        let (impl_generics, ty_generics, where_clause) = ast.generics.split_for_impl();
37
38        let compare_impl = quote! {
39            impl #impl_generics core::clone::Clone for #ident #ty_generics #where_clause {
40                #[inline]
41                fn clone(&self) -> Self {
42                    *self
43                }
44            }
45        };
46
47        tokens.extend(compare_impl);
48    }
49}
educe/trait_handlers/clone/clone_union.rs

educe/trait_handlers/clone/
clone_union.rs
