From b223216433877dede0dfd145c0e9442890dc0a8a Mon Sep 17 00:00:00 2001
From: Paul <pfultz2@yahoo.com>
Date: Fri, 28 Aug 2015 15:01:58 -0500
Subject: [PATCH] Add a check for default construction

---
 fit/function.h | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/fit/function.h b/fit/function.h
index e01ac17..39ab5a0 100644
--- a/fit/function.h
+++ b/fit/function.h
@@ -44,12 +44,14 @@ struct reveal_static_const_factory
     template<class F>
     constexpr reveal_adaptor<F> operator=(const F& f) const
     {
+        static_assert(is_default_constructible<F>::value, "Static functions must be default constructible");
         return reveal_adaptor<F>(f);
     }
 #else
     template<class F>
     constexpr const reveal_adaptor<F>& operator=(const F&) const
     {
+        static_assert(is_default_constructible<F>::value, "Static functions must be default constructible");
         return static_const_var<reveal_adaptor<F>>();
     }
 #endif