From 530af717e7b7efda996fe28a24512d3d662d708e Mon Sep 17 00:00:00 2001
From: HampusM <hampus@hampusmat.com>
Date: Sun, 14 May 2023 14:07:05 +0200
Subject: refactor: improve definition of MaybeStatic

---
 src/util.rs | 29 +++++++++++++++++++++++++++--
 1 file changed, 27 insertions(+), 2 deletions(-)

(limited to 'src/util.rs')

diff --git a/src/util.rs b/src/util.rs
index 5c9ffb8..d96c4f4 100644
--- a/src/util.rs
+++ b/src/util.rs
@@ -1,13 +1,38 @@
 macro_rules! trait_alias {
     (
         $(#[$attr: meta])*
-        $visibility: vis $name: ident$(<$($type_param: ident),*>)?$(: $first_bound: tt $(+ $bound: tt)*)?;
+        $visibility: vis $name: ident$(<$($type_param: ident),*>)?
+            $(: $first_bound: tt $(+ $bound: tt)*)?;
     ) => {
         $(#[$attr])*
         $visibility trait $name $(<$($type_param),*>)? $(: $first_bound $(+ $bound)*)? {}
 
-        impl<T: $($first_bound $(+ $bound)*)?, $($($type_param),*)?> $name$(<$($type_param),*>)? for T {}
+        impl<
+            T: $($first_bound $(+ $bound)*)?,
+            $($($type_param),*)?
+        > $name$(<$($type_param),*>)? for T {}
     };
+
+    // Rule where the trait bounds will only be applied if the specified feature is enabled
+    (
+        bounds_when_feature = $bounds_feature: literal,
+        $(#[$attr: meta])*
+        $visibility: vis $name: ident$(<$($type_param: ident),*>)?
+            $(: $first_bound: tt $(+ $bound: tt)*)?;
+    ) => {
+        #[cfg(feature = $bounds_feature)]
+        trait_alias! {
+            $(#[$attr])*
+            $visibility $name$(<$($type_param),*>)?
+                $(: $first_bound $(+ $bound)*)?;
+        }
+
+        #[cfg(not(feature = $bounds_feature))]
+        trait_alias! {
+            $(#[$attr])*
+            $visibility $name$(<$($type_param),*>)?;
+        }
+    }
 }
 
 macro_rules! feature_alternate {
-- 
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