constexpr the Unit comparison ops

Summary: `constexpr` All The Things!

Reviewed By: Orvid

Differential Revision: D5364910

fbshipit-source-id: 11abeb8adc38aef3ac4f2596ecf0f533b9e74203

diff --git a/folly/Unit.h b/folly/Unit.h
index cfc2703b0437eedfdd49d4a04352b9e88b05d78b..0f90ff6e40f8b7669307b6a67ff66659906033b1 100644 (file)
--- a/folly/Unit.h
+++ b/folly/Unit.h
@@ -45,8 +45,12 @@ struct Unit {
   template <typename T>
   struct Drop : std::conditional<std::is_same<T, Unit>::value, void, T> {};
 
-  bool operator==(const Unit& /*other*/) const { return true; }
-  bool operator!=(const Unit& /*other*/) const { return false; }
+  constexpr bool operator==(const Unit& /*other*/) const {
+    return true;
+  }
+  constexpr bool operator!=(const Unit& /*other*/) const {
+    return false;
+  }
 };
 
 constexpr Unit unit {};