From e9bd8df8b90c00595448f80b19daf022109a711e Mon Sep 17 00:00:00 2001
From: Luca Stefani <luca.stefani.ge1@gmail.com>
Date: Mon, 9 Sep 2019 18:39:08 +0200
Subject: [PATCH] libbacktrace: Fix clang-tidy warning

* warning: overloaded 'operator{++,--}' returns a reference instead of a constant object type [cert-dcl21-cpp]

Change-Id: I8a904622b30dc70d17483b87748c2ea541e50c46
---
 libbacktrace/include/backtrace/BacktraceMap.h | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/libbacktrace/include/backtrace/BacktraceMap.h b/libbacktrace/include/backtrace/BacktraceMap.h
index f8d5058c7..e000a00e2 100644
--- a/libbacktrace/include/backtrace/BacktraceMap.h
+++ b/libbacktrace/include/backtrace/BacktraceMap.h
@@ -79,7 +79,7 @@ public:
       index_++;
       return *this;
     }
-    iterator& operator++(int increment) {
+    const iterator operator++(int increment) {
       index_ += increment;
       return *this;
     }
@@ -87,7 +87,7 @@ public:
       index_--;
       return *this;
     }
-    iterator& operator--(int decrement) {
+    const iterator operator--(int decrement) {
       index_ -= decrement;
       return *this;
     }