From 715dcb8ec52f224b0745527087d5897acf78fd4b Mon Sep 17 00:00:00 2001
From: mcarton <cartonmartin+git@gmail.com>
Date: Fri, 15 Jan 2016 15:51:26 +0100
Subject: [PATCH] Add an is_empty method to types with a len one
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Fix all Clippy’s len_without_is_empty warnings.
---
 src/cargo/core/package.rs          | 4 ++++
 src/cargo/core/source.rs           | 4 ++++
 src/cargo/util/dependency_queue.rs | 5 +++++
 3 files changed, 13 insertions(+)

diff --git a/src/cargo/core/package.rs b/src/cargo/core/package.rs
index 7de725ebb..45242b076 100644
--- a/src/cargo/core/package.rs
+++ b/src/cargo/core/package.rs
@@ -129,6 +129,10 @@ impl PackageSet {
         PackageSet { packages: packages.to_vec() }
     }
 
+    pub fn is_empty(&self) -> bool {
+        self.packages.is_empty()
+    }
+
     pub fn len(&self) -> usize {
         self.packages.len()
     }
diff --git a/src/cargo/core/source.rs b/src/cargo/core/source.rs
index fc5765287..74446f0eb 100644
--- a/src/cargo/core/source.rs
+++ b/src/cargo/core/source.rs
@@ -419,6 +419,10 @@ impl<'src> SourceMap<'src> {
         self.map.insert(id.clone(), source);
     }
 
+    pub fn is_empty(&self) -> bool {
+        self.map.is_empty()
+    }
+
     pub fn len(&self) -> usize {
         self.map.len()
     }
diff --git a/src/cargo/util/dependency_queue.rs b/src/cargo/util/dependency_queue.rs
index 499521bb3..78d48232d 100644
--- a/src/cargo/util/dependency_queue.rs
+++ b/src/cargo/util/dependency_queue.rs
@@ -110,6 +110,11 @@ impl<K: Dependency, V> DependencyQueue<K, V> {
         Some((fresh, key, data))
     }
 
+    /// Returns whether there are remaining packages to be built.
+    pub fn is_empty(&self) -> bool {
+        self.dep_map.is_empty() && self.pending.is_empty()
+    }
+
     /// Returns the number of remaining packages to be built.
     pub fn len(&self) -> usize {
         self.dep_map.len() + self.pending.len()
-- 
2.30.2