From 33580cee78020e8389834ea271556320f33521e4 Mon Sep 17 00:00:00 2001
From: Stanislaw Halik <sthalik@misaki.pl>
Date: Sat, 6 May 2017 13:26:02 +0200
Subject: options/tie: allow for custom-formatting the ini value

---
 options/tie.hpp | 17 +++++++++++++++++
 1 file changed, 17 insertions(+)

(limited to 'options/tie.hpp')

diff --git a/options/tie.hpp b/options/tie.hpp
index a3b5a19f..94fe5d49 100644
--- a/options/tie.hpp
+++ b/options/tie.hpp
@@ -58,6 +58,23 @@ void tie_setting(value<t>& v, QLabel* lb, const QString& format, const xs&... ar
                         v.SAFE_CONNTYPE);
 }
 
+// Clang 3.9 has a bug
+// error: missing default argument on parameter 'args'
+
+// cf. http://stackoverflow.com/questions/29098835/can-parameter-pack-function-arguments-be-defaulted
+
+template<typename t, typename F, typename... xs>
+decltype((void)((std::declval<F>())(std::declval<const t&>())))
+tie_setting(value<t>& v, QLabel* lb, F&& fun, const QString& fmt = QStringLiteral("%1"), const xs&... args)
+{
+    auto closure = [=](const t& x) { lb->setText(fmt.arg(fun(x), args...)); };
+
+    closure(v());
+    base_value::connect(&v, static_cast<void(base_value::*)(const t&) const>(&base_value::valueChanged),
+                        lb, closure,
+                        v.SAFE_CONNTYPE);
+}
+
 OTR_OPTIONS_EXPORT void tie_setting(value<int>& v, QComboBox* cb);
 OTR_OPTIONS_EXPORT void tie_setting(value<QString>& v, QComboBox* cb);
 OTR_OPTIONS_EXPORT void tie_setting(value<QVariant>& v, QComboBox* cb);
-- 
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