From 4cbe2abcc04ba91e4c26d0647187a08797098667 Mon Sep 17 00:00:00 2001
From: Jay Berkenbilt <ejb@ql.org>
Date: Fri, 25 Dec 2020 06:51:45 -0500
Subject: [PATCH] Test empty function detection

---
 libtests/cxx11.cc | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/libtests/cxx11.cc b/libtests/cxx11.cc
index ba4525ed..bec86cec 100644
--- a/libtests/cxx11.cc
+++ b/libtests/cxx11.cc
@@ -48,6 +48,12 @@ void do_functional()
     };
 
     assert(make_addr_lambda(6)(8) == 14);
+
+    // nullptr and {} are empty functions
+    std::function<void()> f1 = {};
+    assert(! f1);
+    std::function<void()> f2 = nullptr;
+    assert(! f2);
 }
 
 // Integer types, type traits