From 3e4cd71073fb3b30792aaf1443261e966cbbcf4b Mon Sep 17 00:00:00 2001
From: Jesse Luehrs <doy@tozt.net>
Date: Mon, 14 May 2018 16:00:51 -0400
Subject: use impl Trait to avoid some allocations

---
 src/power.rs | 8 +++-----
 1 file changed, 3 insertions(+), 5 deletions(-)

diff --git a/src/power.rs b/src/power.rs
index 6bb90ca..6ae762c 100644
--- a/src/power.rs
+++ b/src/power.rs
@@ -99,21 +99,19 @@ impl PowerInfo {
     }
 
     pub fn has_batteries(&self) -> bool {
-        !self.batteries().is_empty()
+        self.batteries().count() > 0
     }
 
-    fn batteries(&self) -> Vec<&PowerSupplyInfo> {
+    fn batteries(&self) -> impl Iterator<Item=&PowerSupplyInfo> {
         self.power_supplies
             .iter()
             .filter(|p| p.ty == PowerSupplyType::Battery)
-            .collect()
     }
 
-    fn mains(&self) -> Vec<&PowerSupplyInfo> {
+    fn mains(&self) -> impl Iterator<Item=&PowerSupplyInfo> {
         self.power_supplies
             .iter()
             .filter(|p| p.ty == PowerSupplyType::AC)
-            .collect()
     }
 }
 
-- 
cgit v1.2.3-54-g00ecf