serde_derive/de/
unit.rs

1use crate::de::Parameters;
2use crate::fragment::Fragment;
3use crate::internals::attr;
4use crate::private;
5use quote::quote;
6
7/// Generates `Deserialize::deserialize` body for a `struct Unit;`
8pub(super) fn deserialize(params: &Parameters, cattrs: &attr::Container) -> Fragment {
9    let this_type = &params.this_type;
10    let this_value = &params.this_value;
11    let type_name = cattrs.name().deserialize_name();
12    let (de_impl_generics, de_ty_generics, ty_generics, where_clause) =
13        params.generics_with_de_lifetime();
14    let delife = params.borrowed.de_lifetime();
15
16    let expecting = format!("unit struct {}", params.type_name());
17    let expecting = cattrs.expecting().unwrap_or(&expecting);
18
19    quote_block! {
20        #[doc(hidden)]
21        struct __Visitor #de_impl_generics #where_clause {
22            marker: _serde::#private::PhantomData<#this_type #ty_generics>,
23            lifetime: _serde::#private::PhantomData<&#delife ()>,
24        }
25
26        #[automatically_derived]
27        impl #de_impl_generics _serde::de::Visitor<#delife> for __Visitor #de_ty_generics #where_clause {
28            type Value = #this_type #ty_generics;
29
30            fn expecting(&self, __formatter: &mut _serde::#private::Formatter) -> _serde::#private::fmt::Result {
31                _serde::#private::Formatter::write_str(__formatter, #expecting)
32            }
33
34            #[inline]
35            fn visit_unit<__E>(self) -> _serde::#private::Result<Self::Value, __E>
36            where
37                __E: _serde::de::Error,
38            {
39                _serde::#private::Ok(#this_value)
40            }
41        }
42
43        _serde::Deserializer::deserialize_unit_struct(
44            __deserializer,
45            #type_name,
46            __Visitor {
47                marker: _serde::#private::PhantomData::<#this_type #ty_generics>,
48                lifetime: _serde::#private::PhantomData,
49            },
50        )
51    }
52}
serde_derive/de/unit.rs

serde_derive/de/
unit.rs
