1 files changed, 18 insertions, 1 deletions
diff --git a/src/util.rs b/src/util.rs
index 78d2cd4..5c9ffb8 100644
--- a/src/util.rs
+++ b/src/util.rs
@@ -10,4 +10,21 @@ macro_rules! trait_alias {
     };
 }
 
-pub(crate) use trait_alias;
+macro_rules! feature_alternate {
+    (
+        feature = $feature: literal,
+        $(#[doc = $doc: literal])*
+        when_enabled = $when_enabled: item,
+        when_disabled = $when_disabled: item
+    ) => {
+        $(#[doc = $doc])*
+        #[cfg(feature = $feature)]
+        $when_enabled
+
+        $(#[doc = $doc])*
+        #[cfg(not(feature = $feature))]
+        $when_disabled
+    };
+}
+
+pub(crate) use {feature_alternate, trait_alias};