From a66d8589c2fd0048680d68945a47ab20fd3f3938 Mon Sep 17 00:00:00 2001
From: Nikolay Kim <fafhrd91@gmail.com>
Date: Sat, 9 Feb 2019 10:45:35 -0800
Subject: [PATCH] add Extensions::contains method

---
 src/extensions.rs | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/src/extensions.rs b/src/extensions.rs
index f7805641b..148e4c18e 100644
--- a/src/extensions.rs
+++ b/src/extensions.rs
@@ -26,6 +26,11 @@ impl Extensions {
         self.map.insert(TypeId::of::<T>(), Box::new(val));
     }
 
+    /// Check if container contains entry
+    pub fn contains<T: 'static>(&self) -> bool {
+        self.map.get(&TypeId::of::<T>()).is_some()
+    }
+
     /// Get a reference to a type previously inserted on this `Extensions`.
     pub fn get<T: 'static>(&self) -> Option<&T> {
         self.map