From b9f080456c4164f11812c6ae1f960bd6adb741ca Mon Sep 17 00:00:00 2001
From: Frank Dellaert <dellaert@gmail.com>
Date: Mon, 8 Oct 2018 22:54:48 -0400
Subject: [PATCH] Catch exception by value

---
 wrap/FileWriter.cpp | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/wrap/FileWriter.cpp b/wrap/FileWriter.cpp
index 783661819..2c3843b37 100644
--- a/wrap/FileWriter.cpp
+++ b/wrap/FileWriter.cpp
@@ -29,7 +29,7 @@ void FileWriter::emit(bool add_header, bool force_overwrite) const {
   bool file_exists = true;
   try {
     existing_contents = file_contents(filename_.c_str(), add_header);
-  } catch (CantOpenFile) {
+  } catch (const CantOpenFile& e) {
     file_exists = false;
   }