From 170fcd715f586cfd6b9f741c0572d472e0abe8ed Mon Sep 17 00:00:00 2001
From: Brad King <brad.king@kitware.com>
Date: Thu, 22 Aug 2019 08:28:08 -0400
Subject: Extend C++17 feature checks to require std::optional

---
 Source/Checks/cm_cxx17_check.cpp | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

(limited to 'Source/Checks')

diff --git a/Source/Checks/cm_cxx17_check.cpp b/Source/Checks/cm_cxx17_check.cpp
index 593d9b263d..29863b136b 100644
--- a/Source/Checks/cm_cxx17_check.cpp
+++ b/Source/Checks/cm_cxx17_check.cpp
@@ -1,6 +1,7 @@
 #include <cstdio>
 #include <iterator>
 #include <memory>
+#include <optional>
 #include <unordered_map>
 
 #ifdef _MSC_VER
@@ -27,5 +28,7 @@ int main()
   IDispatchPtr disp(ptr);
 #endif
 
-  return *u + *ai + *(bi - 1) + (3 - static_cast<int>(ci));
+  std::optional<int> oi = 0;
+
+  return *u + *ai + *(bi - 1) + (3 - static_cast<int>(ci)) + oi.value();
 }
-- 
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