From c3459749ce67e04757dac1f8e91af8203bacbe8f Mon Sep 17 00:00:00 2001
From: Stanislaw Halik <sthalik@misaki.pl>
Date: Thu, 30 Mar 2017 12:53:26 +0200
Subject: compat/util: add macro for warning once

---
 compat/util.hpp | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/compat/util.hpp b/compat/util.hpp
index 9439271f..ee462d0e 100644
--- a/compat/util.hpp
+++ b/compat/util.hpp
@@ -11,6 +11,9 @@
 #include <QDebug>
 
 #define progn(...) ([&]() { __VA_ARGS__ }())
+
+#define once_only(...) progn(static bool once = false; if (!once) { once = true; __VA_ARGS__; })
+
 template<typename t> using mem = std::shared_ptr<t>;
 template<typename t> using ptr = std::unique_ptr<t>;
 
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