From 729848caeb8f519645cb8b924a628b5571d7de2d Mon Sep 17 00:00:00 2001
From: Joe Howse <josephhowse@nummist.com>
Date: Thu, 20 Jun 2019 13:56:29 -0300
Subject: [PATCH] core: revise syntax to support Visual C++ 2013

---
 modules/core/include/opencv2/core/cvstd_wrapper.hpp | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/modules/core/include/opencv2/core/cvstd_wrapper.hpp b/modules/core/include/opencv2/core/cvstd_wrapper.hpp
index 027639bb00..e2c2ea5076 100644
--- a/modules/core/include/opencv2/core/cvstd_wrapper.hpp
+++ b/modules/core/include/opencv2/core/cvstd_wrapper.hpp
@@ -49,7 +49,12 @@ private:
     typedef decltype(check<C>(0)) type;
 
 public:
+#if __cplusplus >= 201103L || (defined(_MSC_VER) && _MSC_VER >= 1900/*MSVS 2015*/)
     static CV_CONSTEXPR bool value = type::value;
+#else
+    // support MSVS 2013
+    static const int value = type::value;
+#endif
 };
 } // namespace sfinae