From 098559ca3552ebd8f80a6d28254f4fa58913b751 Mon Sep 17 00:00:00 2001
From: Boris Kolpackov <boris@codesynthesis.com>
Date: Mon, 25 Jul 2016 08:56:48 +0200
Subject: Add DLL export/import support

---
 butl/optional | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

(limited to 'butl/optional')

diff --git a/butl/optional b/butl/optional
index 86bbe59..0ae7e7b 100644
--- a/butl/optional
+++ b/butl/optional
@@ -12,7 +12,7 @@ namespace butl
   // Simple optional class template while waiting for std::optional.
   //
   struct nullopt_t {constexpr nullopt_t (int) {}};
-  constexpr nullopt_t nullopt = 1;
+  constexpr const nullopt_t nullopt = 1;
 
   template <typename T>
   class optional
-- 
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