From a55e06c6768a402a94928470feac2aa39b3585da Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Fl=C3=B6ssie?= <floessie.mail@gmail.com>
Date: Mon, 10 Aug 2020 13:55:45 +0200
Subject: [PATCH] Remove C++14isms from `delayed_helper::apply()`

Clang to the rescue:
- `void` isn't a literal type in C++11
- calling `f()` from `constexpr` isn't allowed in C++11

So, remove `constexpr` to simplify things.
---
 rtgui/delayed.h | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/rtgui/delayed.h b/rtgui/delayed.h
index cf4f22bf8..b57d7300b 100644
--- a/rtgui/delayed.h
+++ b/rtgui/delayed.h
@@ -55,13 +55,13 @@ namespace delayed_helper
 
     // See https://aherrmann.github.io/programming/2016/02/28/unpacking-tuples-in-cpp14/
     template<typename F, typename T, size_t... Is>
-    constexpr void apply_impl(F f, T t, index_sequence<Is...>)
+    void apply_impl(F f, T t, index_sequence<Is...>)
     {
         f(std::get<Is>(t)...);
     }
 
     template <typename T, typename F>
-    constexpr void apply(F f, T t)
+    void apply(F f, T t)
     {
         apply_impl(f, t, make_index_sequence<std::tuple_size<T>{}>{});
     }