diff options
| -rw-r--r-- | options/tie.hpp | 17 |
1 files changed, 17 insertions, 0 deletions
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); |