feat: add optional deserializer generics static bounds

1 files changed, 29 insertions, 6 deletions

diff --git a/src/deserializer/mod.rs b/src/deserializer/mod.rs
index bd0c0e4..e0c5f6d 100644
--- a/src/deserializer/mod.rs
+++ b/src/deserializer/mod.rs
@@ -2,6 +2,7 @@
 use std::convert::Infallible;
 
 use crate::tagged::TagStart;
+use crate::util::trait_alias;
 use crate::DeserializeTagged;
 
 pub mod buffered;
@@ -23,24 +24,28 @@ pub trait Deserializer
     ///
     /// # Errors
     /// Returns `Err` if deserialization fails.
-    fn de_tag_with<Output, Err, DeserializeFn>(
+    fn de_tag_with<Output, Err, Func>(
         &mut self,
         tag_name: &str,
         ignore_end: IgnoreEnd,
-        deserialize: DeserializeFn,
+        deserialize: Func,
     ) -> Result<Output, Error<Err>>
     where
+        Output: MaybeStatic,
         Err: std::error::Error + Send + Sync + 'static,
-        DeserializeFn: FnOnce(&TagStart, &mut Self) -> Result<Output, Err>;
+        Func: FnOnce(&TagStart, &mut Self) -> Result<Output, Err> + MaybeStatic;
 
     /// Deserializes a list of tagged elements.
     ///
     /// # Errors
     /// Returns `Err` if deserialization fails.
-    fn de_tag_list<De: DeserializeTagged>(
+    fn de_tag_list<De, TagName>(
         &mut self,
-        tag_name: Option<&str>,
-    ) -> Result<Vec<De>, Error<De::Error>>;
+        tag_name: Option<TagName>,
+    ) -> Result<Vec<De>, Error<De::Error>>
+    where
+        De: DeserializeTagged,
+        TagName: AsRef<str> + MaybeStatic;
 
     /// Deserializes a text element.
     ///
@@ -63,6 +68,24 @@ pub trait Deserializer
     fn skip_to_tag_end(&mut self, tag_name: &str) -> Result<(), Error<Infallible>>;
 }
 
+macro_rules! maybe_static_doc {
+    () => {
+        "Bound to `'static` if the `deserializer-static-generics` feature is enabled."
+    };
+}
+
+#[cfg(any(not(feature = "deserializer-static-generics"), doc))]
+trait_alias! {
+    #[doc = maybe_static_doc!()]
+    pub MaybeStatic;
+}
+
+#[cfg(all(feature = "deserializer-static-generics", not(doc)))]
+trait_alias! {
+    #[doc = maybe_static_doc!()]
+    pub MaybeStatic: 'static;
+}
+
 /// Whether or not to skip the end tag of a tagged element.
 ///
 /// **Should be `No`**.