From a699c6b17cf2d272ac445838e82db6b0017cdbd7 Mon Sep 17 00:00:00 2001
From: Behdad Esfahbod <behdad@behdad.org>
Date: Wed, 9 Jan 2019 19:42:41 -0800
Subject: [PATCH] [algs] Add hb_identity

---
 src/hb-algs.hh | 8 +++++---
 1 file changed, 5 insertions(+), 3 deletions(-)

diff --git a/src/hb-algs.hh b/src/hb-algs.hh
index 1cae346..a61925a 100644
--- a/src/hb-algs.hh
+++ b/src/hb-algs.hh
@@ -31,9 +31,11 @@
 #include "hb-null.hh"
 
 
-/*
- * Pair
- */
+static HB_UNUSED struct
+{
+  template <typename T> T
+  operator () (const T& v) const { return v; }
+} hb_identity;
 
 template <typename T1, typename T2>
 struct hb_pair_t
-- 
2.7.4