From 9a0822c445e56580fb3034224191ec825ea0274a Mon Sep 17 00:00:00 2001
From: Stanislaw Halik <sthalik@misaki.pl>
Date: Fri, 13 Oct 2017 15:05:05 +0200
Subject: options/tie: change "tie" overloads

Adjust usages.

There are ODR issues with MSVC and it doesn't support
C++17 "static inline constexpr" _variables_. Otherwise,
"signal_fun" could be a variable and not a function.

The usages in accela/ewma2 dialog are more verbose now
but the original API was silly.
---
 compat/util.hpp | 6 ++++++
 1 file changed, 6 insertions(+)

(limited to 'compat')

diff --git a/compat/util.hpp b/compat/util.hpp
index c0d3e3fd..41c8def9 100644
--- a/compat/util.hpp
+++ b/compat/util.hpp
@@ -8,6 +8,7 @@
 #include "macros.hpp"
 #include "value-templates.hpp"
 
+#include <type_traits>
 #include <memory>
 #include <cmath>
 #include <utility>
@@ -80,3 +81,8 @@ inline auto clamp(const t& val, const u& min, const w& max)
     using tp = decltype(val + min + max);
     return ::util_detail::clamp<std::decay_t<tp>, tp>::clamp_(val, min, max);
 }
+
+template<typename t>
+using cv_qualified = std::conditional_t<is_fundamental_v<std::decay_t<t>>, std::decay_t<t>, const t&>;
+
+
-- 
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